ITI Electrician Semester 4 - Mock Test

Module 1 – Electronic Practice
Module 2 – Control Panel Wiring
Module 3 – AC / DC Motor Drives
Module 4 – Inverter and UPS

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Created on May 10, 2025
Electrician

ITI Electrician Mock Test - Semester 4

Semester : 4
Module 1 - Electronic Practice
Module 2 - Control Panel Wiring
Module 3 - AC / DC Motor Drives
Module 4 - Inverter and UPS

Name

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Category: Electrician 4 sem Module 2

How the control circuit voltage and power in a contactor are to be selected?

A) As per rated current

B) As per supply voltage

C) As per no volt coil rating

D) As per the type of supply

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Category: Electrician 4 sem Module 4

Calculate the voltage and ampere/hour, if four cells rated as 1.5 V and 8 A.H are in parallel?

A) 6 V and 24 AH

B) 3 V and 16 AH

C) 4.5 V and 8 AH

D) 1.5 V and 32 AH

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Category: Electrician 4 sem Module 2

Which supply indicates by the colour of conductor exhibited on Red, Blue and Black?

A) Supply DC 3 wire system

B) Single phase AC system

C) Supply AC system 3 phase

D) Apparatus AC system 3 phase

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Category: Electrician 4 sem Module 4

Which feedback network is used for automatic voltage stabilizer?

A) Current divider network

B) Voltage divider network

C) Tapped transformer network

D) Resistance temperature detector network

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Category: Electrician 4 sem Module 4

How the hard sulphation defect in secondary cell can be prevented?

A) Provide trickle charging

B) Provide freshening charge

C) Provide constant current charging

D) Provide constant potential method charging

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Category: Electrician 4 sem Module 2

How the contacts in a contactor can be engaged for working?

A) By manual operation

B) By mechanical settings

C) By operating electromagnet to change the position

D) By using bimetallic strip to change the position

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Category: Electrician 4 sem Module 1

What is the name of the symbol?

A) Two input OR gate

B) Two input AND gate

C) Two input NOR gate

D) Two input NAND gate

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Category: Electrician 4 sem Module 2

What is the purpose of thermal over load relay in control panel?

A) Switching ON/OFF the circuit

B) Protect the circuit from earth fault

C) Control the circuit based on time delay

D) Protect the motor from over heating and loading

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Category: Electrician 4 sem Module 1

What is the criteria to decide a material as conductor, semi conductor and insulator?

A) Atomic bonding structure of atom

B) Existence of valance electrons in atom

C) Atomic weight of the atom of the material

D) Atomic number of the atom of the material

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Category: Electrician 4 sem Module 2

Which device prevents flare out of stripped and stranded cables in the panel board?

A) Sleeves

B) Wire ferrules

C) Lugs and thimbles

D) Cable binding straps and button

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Category: Electrician 4 sem Module 3

Why the A.C drives are mostly used in process plant?

A) Easy to operate

B) Robust in construction

C) Very high starting torque

D) Maintenance free long life

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Category: Electrician 4 sem Module 1

Which circuit is essential to maintain oscillations or waves in an oscillator circuit?

A) Rectifier with filter

B) Voltage multiplier

C) Negative feed back

D) Positive feed back

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Category: Electrician 4 sem Module 1

Which filter circuit is capable of removing voltage spikes in the rectifier circuit?

A) LC filter

B) RC filter

C) Capacitor input filter

D) Series inductor filter

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Category: Electrician 4 sem Module 3

What is the reason of using shielded cable for connecting low level signal circuits in DC drives?

A) Easy for connection

B) Good appearance

C) Protects from mechanical injuries

D) Eliminates the electrical interference

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Category: Electrician 4 sem Module 2

Which device protects from overload and short circuit in a panel board?

A) Isolating switch

B) Time delay relay

C) Thermal overload relay

D) Miniature circuit breaker

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Category: Electrician 4 sem Module 2

Which accessory is used to mount MCB,OLR in the panel board without using screws?

A) DIN Rail

B) G. channel

C) Grommets

D) PVC channel

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Category: Electrician 4 sem Module 1

Which multi vibrator produces a repetitive pulse wave form output?

A) Astable multi vibrator

B) Bistable multi vibrator

C) One shot multi vibrator

D) Monostable multi vibrator

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Category: Electrician 4 sem Module 2

What is the name of the device marked as ‘X’?

A) Stop button

B) Start button

C) Main contact

D) Auxiliary contact

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Category: Electrician 4 sem Module 4

Which principle the constant voltage transformer works?

A) Self induction principle

B)  Fall in potential principle

C) Ferro-resonant principle

D) Mutual induction principle

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Category: Electrician 4 sem Module 1

What is the effect of pinch-off voltage in JFET?

A) No depletion region exists

B) Drain current becomes zero

C) Reverse bias voltage becomes zero

D) Width of channel has maximum value

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Category: Electrician 4 sem Module 2

Why control panels are provided with control transformer?

A) To maintain rated voltage to load

B) To operate the auxiliary circuits

C) To maintain rated main supply voltage

D) To supply reduced voltage to power circuit

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Category: Electrician 4 sem Module 1

Why negative feedback is required in amplifier circuits?

A) To reduce the distortion

B) To increase the amplification factor

C) To increase the output voltage gain

D) To increase the output current gain

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Category: Electrician 4 sem Module 2

What is the criteria to select the contactor?

A) Type of supply

B) Type of load connected

C) Supply voltage and load

D) Place of use the contactor

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Category: Electrician 4 sem Module 4

What is the full form of UPS?

A) Uniform Power Supply

B) Universal Power Supply

C) Unregulated Power Supply

D) Uninterrupted Power Supply

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Category: Electrician 4 sem Module 3

Which drive is classified according to mode of operation?

A) Group drive

B) Manual drive

C) Individual drive

D) Continuous duty drive

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Category: Electrician 4 sem Module 2

Why the motor is not changing the direction, if reverse push button is pressed in forward and reverse control star delta starter?

A) No volt coil is not energized

B) Fault in forward contactor

C) Due to interlock in reverse contactor

D) No voltage exist in reverse contactor

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Category: Electrician 4 sem Module 4

What is the effect during loading of the cell, the current strength falls and become zero?

A) Buckling

B) Polarization

C) Local action

D) Amalgamation

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Category: Electrician 4 sem Module 3

What is the function of IGBT in AC drive?

A) Smoothening incoming A.C supply

B) Controls the power delivered to the motor

C) Stabilize the output voltage from the rectifier

D) Converts incoming A.C power into D.C power output

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Category: Electrician 4 sem Module 1

What is the purpose of connecting L1 through C1 to the transistor base?

A) Provides DC supply

B) Provides positive feed back

C) Provides negative feedback

D) Provides transistor biasing voltage

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Category: Electrician 4 sem Module 1

What is the use of time-base control switch or knob in the CRO?

A) Select sweep speed

B) Select input voltage range

C) Select input signal voltage

D) Select intensity of the beam

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Category: Electrician 4 sem Module 3

Why the A.C drives are better suited for high speed operation?

A) High starting torque

B) Robust in construction

C) Having lighter gauge winding

D) No brushes and commutation

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Category: Electrician 4 sem Module 1

Which quantity can be measured by CRO?

A) Frequency

B) Inductance

C) Resistance

D) Power factor

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Category: Electrician 4 sem Module 2

Which cable ties are used to bunch the wires?

A) Silk ties

B) P.V.C ties

C) Nylon ties

D) Cotton ties

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Category: Electrician 4 sem Module 3

How the base speed of D.C shunt motor can be increased by using D.C drive?

A) By reducing the field current

B) By increasing the field current

C) By increasing the supply voltage

D) By reducing the armature voltage

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Category: Electrician 4 sem Module 1

How the gate terminal of N channel JFET biased?

A) Gates are reverse biased

B) Gates are forward biased

C) Gates are forward biased with drain

D) Gates are reverse biased with source

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Category: Electrician 4 sem Module 3

What is the full form of B.O.P in D.C drive?

A) Bridge Operation Panel

B) Basic Operational Panel

C) Basic Operation Programme

D) Bridge Operator Programme

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Category: Electrician 4 sem Module 1

How does the depletion region behave?

A) As resistor

B) As insulator

C) As conductor

D) As semi conductor

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Category: Electrician 4 sem Module 2

What is the use of ‘G’ channels in control panel?

A) For fixing relays

B) For fixing contactors

C) For fixing instruments

D) For fixing terminal connectors

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Category: Electrician 4 sem Module 3

What is the name of the component marked as ‘X’ in the block diagram of AC drive?

A) Rectifier

B) D.C bus

C) Inverter

D) A.C motor

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Category: Electrician 4 sem Module 2

Why sequential control of motors is required in an industrial application?

A) To share more loads

B) To reduce power consumption

C) To minimise the operating cost

D) To increase the accuracy of operation

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Category: Electrician 4 sem Module 1

What is the characteristic property of base material in a transistor?

A) Lightly doped and very thin

B) Heavily doped and very thin

C) Lightly doped and very larger

D) Heavily doped and very larger

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Category: Electrician 4 sem Module 1

Why most of semi conductor devices are made by silicon compared to germanium?

A) High barrier voltage

B) High resistance range

C) High thermal conductivity

D) High current carrying capacity

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Category: Electrician 4 sem Module 2

Which material is used to make open frame bimetallic adjustable thermostat contacts?

A) Silver

B) Brass

C) Copper

D) Bronze

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Category: Electrician 4 sem Module 1

What is the output voltage if the centre tap of transformer is open circuited in a full wave rectifier circuit?

A) Zero voltage

B) Full rated output

C) Half of the rated output

D) One fourth of rated output

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Category: Electrician 4 sem Module 3

Which type of sensing unit employed in drive system?

A) Opto coupler

B) Speed sensing

C) Photo voltaic cell

D) Resistance temperature detector

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Category: Electrician 4 sem Module 3

What is the advantage of AC drive compared to DC drive?

A) Requires less space

B) Installation and running cost is less

C) Fast response and wide speed range of control

D) Power circuit and control circuits are simple

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Category: Electrician 4 sem Module 1

Which electronic circuit generates A.C signal without input?

A) Filter circuit

B) Rectifier circuit

C) Amplifier circuit

D) Oscillator circuit

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Category: Electrician 4 sem Module 2

How to protect the cable from insects and rats into the panel?

A) By using sleeve

B) By using Grommets

C) By using cable binding straps

D) By providing nylon cable ties

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Category: Electrician 4 sem Module 3

What is the main use of A.C drive?

A) High starting torque

B) Group drive motors

C) Control stepless speed in motors

D) Interlocking system in industries

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Category: Electrician 4 sem Module 2

Which is the standard duty cycle code of the contactor for starting and stopping the AC resistive and inductive load?

A) AC1

B) AC2

C) AC3

D) AC4

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Category: Electrician 4 sem Module 1

How the decimal number can be converted into binary number?

A) Divide decimal by 4

B) Multiplying decimal by 4

C) Dividing decimal by 2

D) Multiplying decimal 2

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Category: Electrician 4 sem Module 1

What defect will occur in the radio, if the pulsations are not removed from the input of the rectifier?

A) Improper tuning

B) No response

C) Humming sound

D) Works with low volume

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Category: Electrician 4 sem Module 1

Which instrument provides a visual representation of measured or tested quantities?

A) Voltage stabilizer

B) Function generator

C) Cathode ray oscilloscope

D) Radio frequency generator

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Category: Electrician 4 sem Module 2

What happens, if time delay relay of a auto star delta starter still in closed condition after starting?

A) Starts and stop

B) Runs normally

C) Runs in star only

D) Runs in delta only

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Category: Electrician 4 sem Module 1

Which is a passive component?

A) Diac

B) Diode

C) Transistor

D) Capacitor

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Category: Electrician 4 sem Module 4

Which part in UPS supplies continuous output voltage in case of input voltage failure?

A) Battery unit

B) Inverter unit

C) Rectifier unit

D) Controller unit

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Category: Electrician 4 sem Module 4

Which transformer is used in servo voltage stabilizer?

A) Step up transformer

B) Step down transformer

C) Torodial autotransformer

D) Constant voltage transformer

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Category: Electrician 4 sem Module 4

What is the advantage of on-line UPS over offline UPS?

A) Supplies constant power output

B) It gives constant output frequency

C) Works on single phase or three phase supply

D) Free from change over and transition problems

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Category: Electrician 4 sem Module 1

Which electronic circuit produces signal waves or pulses without an input?

A) Detector

B) Amplifier

C) Oscillator

D) Modulator

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Category: Electrician 4 sem Module 1

What is the name of the device symbol?

A) SCR

B) IGBT

C) DIAC

D) TRIAC

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Category: Electrician 4 sem Module 1

What is the main function of Uni Junction Transistor (UJT)?

A) Relaxation oscillator

B) Broadcast transmitter

C) Loud speaker amplifier

D) Microphone input device

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Category: Electrician 4 sem Module 1

Which logic gate refers the truth table?

A) AND

B) NOT

C) NOR

D) NAND

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Category: Electrician 4 sem Module 4

What is the reason for having low back up time in UPS?

A) Fault in inverter circuit

B) Battery is short circuited

C) Mains earthing is not proper

D) Ampere hour (A.H) capacity of battery is not sufficient

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Category: Electrician 4 sem Module 3

Which type of machine in industries is provided with multi motor electric drive?

A) Rolling machine

B) Air Compressor

C) Shearing machine

D) Heavy duty electric drilling machine

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Category: Electrician 4 sem Module 1

What is the main application of a Field Effect Transistor (FET)?

A) Voltage control device

B) Current control device

C) Positive feedback device

D) Low input impedance device

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Category: Electrician 4 sem Module 1

What is the power gain of CE amplifier with a voltage gain of 66 and  (Beta) of the transistor is 100?

A) 1.5

B) 166

C) 0.66

D) 6600

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Category: Electrician 4 sem Module 1

What is the name of amplifier?

A) Common emitter amplifier

B) Class B push pull amplifier

C) Common collector amplifier

D) Class AB push pull amplifier

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Category: Electrician 4 sem Module 2

What essential feature to be considered while designing a layout of control panel?

A) Proper type of protection and measuring system

B) Inside area and number of indicating lights in front panel

C) Suitable method of labelling and cable harnessing

D) Outside dimensions and swing area of cabinet door

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Category: Electrician 4 sem Module 2

Which switch with an actuator is operated by the motion of a machine or part of an object?

A) Limit switch

B) Toggle switch

C) Isolating switch

D) Push button switch

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Category: Electrician 4 sem Module 1

Why a snubber circuit is used in the TRIAC motor control circuit?

A) To avoid false triggering

B) To increase the life of TRIAC

C) To increase the motor torque

D) To maintain the motor speed constant

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Category: Electrician 4 sem Module 1

Which resistor determines the voltage gain in a common emitter amplifier?

A) R1

B) R2

C) RL

D) Re

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Category: Electrician 4 sem Module 1

Which is a active component?

A) Inductor

B) Resistor

C) Capacitor

D) Transistor

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Category: Electrician 4 sem Module 2

What is the name of the accessory used in control panel wiring?

A) Wire ferrules

B) Wire sleeves

C) Nylon cable ties

D) Cable binding strap

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Category: Electrician 4 sem Module 2

Which circuit, the limit switches are used?

A) Domestic power circuits

B) Lift circuits

C) Street lighting

D) Motor control circuits

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Category: Electrician 4 sem Module 1

How the input impedance of CRO can be increased?

A) By adding resistance to CRO probe

B) By adding resistance to trigger level circuit

C) By increasing time/base attenuator switch position

D) By increasing volts/cm attenuator switch position

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Category: Electrician 4 sem Module 3

Which is proportional to the torque in D.C motor?

A) Back e.m.f

B) Field current

C) Terminal voltage

D) Armature current

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Category: Electrician 4 sem Module 1

What is the main application of uni junction transistor?

A) Rectification

B) Amplification

C) Regulator circuits

D) Triggering circuits

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Category: Electrician 4 sem Module 1

Which oscillator provides high accurate stable frequency?

A) Hartley oscillator

B) Colpitts oscillator

C) Quartz crystal oscillator

D) R.C phase shift oscillator

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Category: Electrician 4 sem Module 4

Which is the function of an inverter?

A) Converts A.C voltage into D.C voltage

B) Converts D.C voltage into A.C voltage

C) Converts D.C voltage into higher D.C voltage

D) Converts A.C voltage into higher A.C voltage

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Category: Electrician 4 sem Module 4

What is the minimum permissible single phase working voltage, if the declared voltage is 240V as per ISI?

A) 233 V

B) 228 V

C) 216 V

D) 211 V

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Category: Electrician 4 sem Module 3

What is the disadvantage of DC drive?

A) Not suitable for high speed operation

B) More complex with a single power conversion

C) More expensive than AC drive for high capacity motor

D) Installation of DC drives is more complicated

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Category: Electrician 4 sem Module 4

Where square wave inverters are used?

A) Computers

B) TV receiver

C) DVD players

D) General lighting

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Category: Electrician 4 sem Module 3

Which is the application of single quadrant loads operating in first quadrant in drives?

A) Hoists

B) Elevators

C) Conveyors

D) Centrifugal pumps

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Category: Electrician 4 sem Module 3

What is the function of power controller in drive circuits?

A) It sounds an alarm in no load conditions

B) It detects the overloading condition of motor

C) It reduce motor current during transient operation

D) It maintain the torque at low voltage conditions

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Category: Electrician 4 sem Module 2

Which is the correct sequence operation of contactors for operating automatic star delta starter?

A) MainStarDeltaTi mer

B) Star MainTimerDelta

C) MainTimerDelta Star

D) StarTimer MainDelta

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Category: Electrician 4 sem Module 4

What is the purpose of output transformer in inverters?

A) Step up input AC

B) Step down input AC

C) Step up AC from amplifier

D) Step down AC from amplifier

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Category: Electrician 4 sem Module 4

What are the important stages in a simple inverter?

A) Oscillator and rectifier stages

B) Oscillator and amplifier stages

C) Amplifier and transformer output stages

D) Oscillator, amplifier and transformer output stages

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Category: Electrician 4 sem Module 1

What is the difference in current control of MOSFET compared to JFETs?

A) Insulating layer instead of junction

B) Using N material instead of P material

C) Using P material instead of N material

D) Using N material gate instead of P material

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Category: Electrician 4 sem Module 1

What is the reason for widened barrier in a reverse biased diode?

A) Minority carriers in two materials are neutralised

B) Electron in N material is drifted to positive terminal

C) Holes in P material attracted to negative terminal

D) Electrons and holes are attracted towards supply terminals

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Category: Electrician 4 sem Module 2

Which device controls the operations in sequential control systems?

A) Timer

B) Relays

C) Contactor

D) Control transformer

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Category: Electrician 4 sem Module 1

Which is the main application of SCR?

A) Amplifier

B) Oscillators

C) Multi vibrators

D) Speed control of motors

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Category: Electrician 4 sem Module 3

What is the name of the characteristic curve in D.C drive?

A) Speed Vs torque characteristic

B) Torque Vs field current characteristic

C) Speed Vs armature current characteristic

D) Field current Vs armature current characteristic

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Category: Electrician 4 sem Module 1

What is the minimum voltage required in the base emitter junction to conduct a silicon transistor?

A) 0.2 V – 0.3 V

B) 0.4 V – 0.5 V

C) 0.6 V – 0.7 V

D) 0.8 V – 0.9 V

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Category: Electrician 4 sem Module 4

What is the reason for tripping the UPS with full load?

A) Main supply failure

B) Incorrect over load settings

C) Battery charger input fuse blown out

D) Loose connection in battery terminal

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Category: Electrician 4 sem Module 1

What is the formula to calculate the resonance frequency in an oscillator circuit?

A) .

B) .

C) .

D) .

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Category: Electrician 4 sem Module 1

What is the type of function in the transistor circuit?

A) Switching

B) Oscillation

C) Modulation

D) Amplification

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Category: Electrician 4 sem Module 4

Which type of output transformer is used in automatic voltage stabilizer?

A) Auto transformer

B) Static transformer

C) Ring core type transformer

D) Ferrite core type transformer

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Category: Electrician 4 sem Module 1

Which doping material is used to make P- type semi conductor?

A) Boron

B) Arsenic

C) Antimony

D) Phosphorous

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Category: Electrician 4 sem Module 3

Which control system consumes very low power for motion control in AC and DC motors?

A) Field control

B) Drives control

C) Voltage control

D) Armature control

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Category: Electrician 4 sem Module 1

What is the purpose of DIAC in power control circuits?

A) As rectifier

B) For triggering

C) As an oscillator

D) For amplification

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Category: Electrician 4 sem Module 1

Which quadrant operation of SCR delivers heavy current in reverse biasing?

A) First quadrant

B) Third quadrant

C) Fourth quadrant

D) Second quadrant

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Category: Electrician 4 sem Module 1

What is the reason for barrier voltage is more in silicon material?

A) Lower atomic number

B) Resistance is very low

C) Doping percentage is more

D) Valance electrons are two only

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Category: Electrician 4 sem Module 2

Which DC load is represented by the DC4 standard duty cycle of contactors?

A) Resistive loads except motor loads

B) Starting and stopping of shunt motor

C) Starting and stopping of series motor

D) Starting and stopping with inching and braking

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Category: Electrician 4 sem Module 2

Which type of device protects motors from over heating and over loading in a panel board?

A) Rectifier

B) Limit switch

C) Thermal relay

D) Electro mechanical relay

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Category: Electrician 4 sem Module 1

Which device has very high input impedance, low noise output, good linearity and low inter electrode capacity?

A) NPN transistor

B) PNP transistor

C) Field effect transistor

D) Uni junction transistor

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Category: Electrician 4 sem Module 2

What is the function of limit switch in control panel wiring?

A) Controls machine from over heat

B) Controls machine from over speed

C) Controls machine from over loading

D) Controls distance movement of any machine

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Category: Electrician 4 sem Module 4

Which term refers that the mass of a substance liberated from an electrolyte by one coulomb of electricity?

A) Electrolysis

B) Electro plating

C) Electro copying

D) Electro chemical equivalent

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Category: Electrician 4 sem Module 3

Which control system is used for Eddy current drives?

A) Slip controller

B) Rectifier controller

C) AC voltage controller

D) DC chopper controller

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Category: Electrician 4 sem Module 3

How the constant torque can be obtained from armature and field controlled drives?

A) By reducing the field current

B) By increasing the field current

C) By reducing the armature current

D) By controlling the armature voltage

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Category: Electrician 4 sem Module 1

What is the type of amplifier circuit?

A) Common base amplifier

B) Common emitter amplifier

C) Class B push pull amplifier

D) Common collector amplifier

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Category: Electrician 4 sem Module 2

Which device is avoided in the panel board assembly?

A) Sensors

B) Indicating lamp

C) Isolating switch

D) Push button switch

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Category: Electrician 4 sem Module 3

Which device controls the speed of A.C motor in A.C drive?

A) Field supply unit (FSU)

B) COMMS technology box

C) Speed feedback technology box

D) Microprocessor based electronic device

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Category: Electrician 4 sem Module 1

How many characters are in hexadecimal number system?

A) 6

B) 8

C) 12

D) 16

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Category: Electrician 4 sem Module 1

What is the purpose of using binary coded decimal (BCD) system in digital circuits?

A) Storing the data inputs

B) Control the binary system

C) Interface to binary system

D) Segregating the input parameters

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Category: Electrician 4 sem Module 1

What is the peak voltage of 220V rms AC voltage?

A) 310.02 V

B) 311.17 V

C) 312.25 V

D) 315.20 V

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Category: Electrician 4 sem Module 2

What is the name of the accessory used in control panel wiring?

A) Lugs

B) Thimble

C) Grommet

D) Terminal connector

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Category: Electrician 4 sem Module 3

What is electric drive?

A) A device used as prime mover for generator

B) A device converts A.C to D.C supply

C) An electro mechanical device for controlling motor

D) A machine converts mechanical energy into electrical

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Category: Electrician 4 sem Module 1

Which type of control device is used in electronic fan regulator control circuits?

A) FET

B) UJT

C) DIAC

D) TRIAC

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Category: Electrician 4 sem Module 1

Which letter indicates the compound material cadmium sulphide?

A) ‘A’

B) ‘B’

C) ‘C’

D) ‘R’

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Category: Electrician 4 sem Module 1

What is the function of a transistor if emitter to base and collector to base are forward biased?

A) Acts as an amplifier

B) Acts as an oscillator

C) Acts as an open circuit

D) Acts as a closed switch

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Category: Electrician 4 sem Module 3

What is the purpose of LCD on basic operator panel in D.C drive?

A) Indicate the fault

B) Display the speed

C) Monitor the parameter

D) Display availability of supply

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Category: Electrician 4 sem Module 3

Why it is necessary to keep V/F ratio constant in a drive?

A) Keep the stator flux maximum

B) Maintain the rotor current minimum

C) Maintain the speed of motor constant

D) Maintain the rated torque at all speeds

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Category: Electrician 4 sem Module 1

What is the main advantage of a class A amplifier?

A) Minimum distortion

B) Maximum current gain

C) Maximum voltage gain

D) Minimum signal to noise ratio losses

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Category: Electrician 4 sem Module 1

What is the effect, if SCR is latched into conduction and gate current is removed in DC?

A) SCR gets cut off

B) Current through SCR OFF

C) Output voltage will be reduced

D) Gate looses control over conduction

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Category: Electrician 4 sem Module 3

What is IGBT in VF drive?

A) Inverter switching device

B) D.C bus switching device

C) Rectifier switching device

D) Field supply switching device

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Category: Electrician 4 sem Module 4

What is the effect in internal resistance of a discharged cell?

A) Increase

B) Decrease

C) Becomes zero

D) Remain same

127 / 167

Category: Electrician 4 sem Module 3

What is the purpose of LCD in Basic Operator Panel (BOP) in AC drive?

A) Indicate the status of drive

B) Monitor the parameter of AC drive

C) Indicate the display error in reading

D) Indicate the incorrect operation of BOP

128 / 167

Category: Electrician 4 sem Module 3

What is the function of VSI drives?

A) Converts A.C to D.C

B) Converts A.C to A.C

C) Converts D.C to A.C

D) Converts D.C to D.C

129 / 167

Category: Electrician 4 sem Module 2

What is the purpose of control transformer used in control panel wiring?

A) To maintain constant terminal voltage

B) To supply the power to the auxiliary circuits

C) To control the supply voltage to the contactor

D) To protect the control elements from over voltage fault

130 / 167

Category: Electrician 4 sem Module 1

What is the output DC voltage in half wave rectifier, if the input AC voltage is 24 volt?

A) 24 Volt

B) 12 Volt

C) 9.6 Volt

D) 10.8 Volt

131 / 167

Category: Electrician 4 sem Module 2

What is the use of PVC channel in a control panel wiring?

A) Mounting MCB

B) Mounting relays

C) Path way for electrical wiring and protection

D) Mounting double deck terminal contactor

132 / 167

Category: Electrician 4 sem Module 1

Which resistor is used to measure light intensity?

A) VDR

B) NTC

C) PTC

D) LDR

133 / 167

Category: Electrician 4 sem Module 4

Which is the application of automatic stepped voltage stabilizer?

A) Geyser

B) Grinder

C) Television

D) Pump motor

134 / 167

Category: Electrician 4 sem Module 2

What is the reason for providing two separate Earthing in panel board?

A) Panel board is made in metal box

B) Control the stray field in the panel

C) Reduce the voltage drop in panel board

D) Ensure one earthing in case of other failure

135 / 167

Category: Electrician 4 sem Module 1

Why the collector region is physically made larger than emitter region in a transistor?

A) It has to dissipate more heat

B) Output taken from collector terminal

C) Base collector region is reverse biased

D) Collector region always operate with high voltage

136 / 167

Category: Electrician 4 sem Module 3

What is the purpose of JOG key in control panel of D.C drive?

A) Stop the motor

B) Restart the motor

C) Inching operation

D) Reverse the direction of motor

137 / 167

Category: Electrician 4 sem Module 1

Which type of biasing is required to a NPN transistor for amplification?

A) Base ground, emitter and collector positive

B) Base negative, emitter positive and collector negative

C) Base positive, emitter negative and collector positive

D) Base positive, emitter negative and collector negative

138 / 167

Category: Electrician 4 sem Module 1

What is the frequency of the displayed signal on CRO screen covered by 5 division with a time base setting of 0.2 micro seconds?

A) 1.0 KHz

B) 10.0 KHz

C) 100.0 KHz

D) 1000.0 KHz

139 / 167

Category: Electrician 4 sem Module 3

Which is the classification of drive according to dynamics and transients?

A) Short time duty drive

B) Intermittent duty drive

C) Automatic control drive

D) Variable position control drive

140 / 167

Category: Electrician 4 sem Module 3

Which is the correct sequence operation of key button in BOP of AC drive to change the direction of rotation?

A) Press ON  REV  ON

B) Press OFF  REV  ON

C) Press ON  OFF  REV  ON

D) Press ON  REV  OFF  ON

141 / 167

Category: Electrician 4 sem Module 4

What is the full form of PWM?

A) Pulse Wide Modulation

B) Pulse Width Modulation

C) Phase Wide Modulation

D) Phase Width Modulation

142 / 167

Category: Electrician 4 sem Module 1

What is the input ripple frequency (Fin) of full wave rectifier?

A) Fin = ½ F

B) Fin

C) Fin = 2 Fin

D) Fin = 2

143 / 167

Category: Electrician 4 sem Module 4

Which instrument is used to check short circuit faults in electronic circuit in voltage stabilizer?

A) Ammeter

B) Voltmeter

C) Ohmmeter

D) Multimeter

144 / 167

Category: Electrician 4 sem Module 3

What is the purpose of PROG / DATA button in BOP of AC drive?

A) To change the parameter setting

B) To store the entered data and factory stored data

C) To display the data direction of rotation forward / REV

D) To display the data status of frequency and current

145 / 167

Category: Electrician 4 sem Module 4

How the backup time of UPS can be increased?

A) Increase the VA rating of UPS

B) Increase the AH capacity of battery

C) Decrease the AH capacity of battery

D) Maintain battery terminal voltage always 90% of rating

146 / 167

Category: Electrician 4 sem Module 2

What is the name of the wiring accessory used in control panel wiring?

A) DIN rails

B) G channel

C) Grommets

D) Race ways

147 / 167

Category: Electrician 4 sem Module 2

What is the name of the device marked as ‘X’ in the circuit?

A) Contactor

B) No volt coil

C) Stop button

D) Over load relay trip

148 / 167

Category: Electrician 4 sem Module 1

What is the output voltage in the full wave rectifier circuit?

A) No output

B) Rated output

C) Half the rated output

D) Double the rated output

149 / 167

Category: Electrician 4 sem Module 4

Which electrical device is actuating the voltages in a stepped voltage stabilizer?

A) Autostat

B) Output transformer

C) Over voltage relay

D) Under voltage relay

150 / 167

Category: Electrician 4 sem Module 1

What is the total turn-on time (ton) while transistor makes a transition from V2 to V1?

A) ton= tr - ts

B) ton= tr - td

C) ton= td + tr

D) ton= tr+ td+ ts

151 / 167

Category: Electrician 4 sem Module 1

Which logic gate refers the truth table?

A) OR gate

B) NOT gate

C) AND gate

D) NOR gate

152 / 167

Category: Electrician 4 sem Module 1

Why a feedback network is used in the oscillator?

A) To cancel noise distortion

B) To phase shift the signal by 60°

C) To phase shift the signal by 180°

D) To cancel second harmonic distortion

153 / 167

Category: Electrician 4 sem Module 1

What is the minimum and maximum value of resistor with four colour bands, red, violet, orange and gold respectively?

A) 23750Ω - 26250Ω

B) 24700Ω - 27300Ω

C) 25650Ω - 28350Ω

D) 22400Ω - 33600Ω

154 / 167

Category: Electrician 4 sem Module 1

Which code indicates silicon semi conductor diode?

A) OA 79

B) BY 126

C) IN 4007

D) 2N 3055

155 / 167

Category: Electrician 4 sem Module 4

Which is frequency converter?

A) Rectifiers

B) D.C choppers

C) Cyclo converters

D) D.C to A.C converters

156 / 167

Category: Electrician 4 sem Module 1

Which device is made up of using the methods of point contact, grown, diffusion and alloy junctions?

A) Inductor

B) Resistor

C) Capacitor

D) Transistor

157 / 167

Category: Electrician 4 sem Module 2

Which switch is operated at OFF load condition?

A) Limit switch

B) Isolating switch

C) Two way switch

D) Push button switch

158 / 167

Category: Electrician 4 sem Module 1

Which is the advanced version of power electronic component used in the output stage in drives?

A) FET

B) UJT

C) SCR

D) IGBT

159 / 167

Category: Electrician 4 sem Module 2

Why power and control wirings run in separate race ways?

A) To reduce heat

B) To reduce the radio interference

C) To increase the insulation resistance

D) To increase the current carrying capacity

160 / 167

Category: Electrician 4 sem Module 4

Which electronic circuit is used in a automatic voltage stabilizer to produce constant output voltage?

A) Feedback circuit

B) Rectifier circuit

C) Amplifier circuit

D) Oscillator circuit

161 / 167

Category: Electrician 4 sem Module 4

What is the type of A.C voltage stabilizer?

A) Servo voltage stabilizer

B) Automatic voltage stabilizer

C) Manual stepped voltage stabilizer

D) Constant voltage transformer stabilize

162 / 167

Category: Electrician 4 sem Module 2

What is the purpose of DIN-rail used in control panel wiring?

A) It provides a path way for electrical wiring

B) Install the high powered circuit accessories

C) Mounting the double deck terminal connectors

D) Mounting the control accessories without screws

163 / 167

Category: Electrician 4 sem Module 3

What is the function of Field Supply Unit (FSU) in DC drive?

A) Produces required firing current to the firing circuit

B) Provides variable voltage to the field winding of motor

C) Provides a constant voltage to the field winding of motor

D) Provides a constant voltage to the armature of the motor

164 / 167

Category: Electrician 4 sem Module 1

What is the function of R1 variable resistor?

A) Controls the current in R2

B) Protects from overload to TRIAC

C) Protects the RFI filter from overloading

D) Controls the pulse rate for triggering theTRIAC

165 / 167

Category: Electrician 4 sem Module 4

Which is the cause for the fault if the output voltage of UPS is higher than normal?

A) Battery get short circuited

B) Defective feedback circuit

C) Input voltage is very high

D) Relay points are joined together

166 / 167

Category: Electrician 4 sem Module 3

Which power modulator used in the electric drive system?

A) Cyclo converters

B) Frequency multiplier

C) Phase sequence indicator

D) Servo controlled voltage stabilizer

167 / 167

Category: Electrician 4 sem Module 1

What is the type of amplifier?

A) Push Pull Amplifier

B) Common Base Amplifier

C) Emitter Follower Amplifier

D) Common Emitter Amplifier

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