Electrician ITI - 100 Technical MCQ

Electrician Trade Interview and Technical Practice Test

Interview Questions based on Electrician CTS 2.0 Syllabus
Reference: Government of India, DGT - Electrician CTS 2.0, Revised July 2022
Open Electrician CTS 2.0 Reference PDF

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Source basis: Electrician, Competency Based Curriculum, Craftsmen Training Scheme (CTS), NSQF Level 4, Revised July 2022, Directorate General of Training, Ministry of Skill Development and Entrepreneurship. The quiz contains technical questions only; it does not ask students to identify the syllabus document.

About this practice set

This page holds 100 multiple-choice questions for Electrician ITI, written to follow the CTS 2.0 syllabus of the Directorate General of Training (DGT) where the source reference above applies. It suits ITI trainees preparing for the all India trade test, for campus or apprenticeship interviews and for quick revision before a viva. The quiz checks each answer and gives an explanation; the full answer key follows so the questions are also readable without running the quiz.

How to use this quiz

Attempt the questions in one sitting without searching for answers.
Read the explanation shown after each answer, even when you were right.
Write down the questions you missed and the reason in your own words.
Open the answer key below to revise those questions.
Retake the quiz after a day or two and compare your score.

Sample of what is covered

Which material is generally used as a conductor in electrical wiring because of its good conductivity?
What happens to total resistance when resistors are connected in series?
In a balanced three-phase delta connection, how is line voltage related to phase voltage?
Which equipment is used to measure earth electrode resistance?
Which winding methods are covered for DC machines?
What is the purpose of synchronizing alternators before parallel operation?
What is the main purpose of an IGBT in power electronics?
What is the purpose of a circuit breaker?

Answer key with explanations (100 questions)

Q1. Which material is generally used as a conductor in electrical wiring because of its good conductivity?

A. Mica

B. Rubber

C. Porcelain

D. Copper ✓ Correct answer

Explanation: Copper has high electrical conductivity and is widely used for electrical conductors.

Q2. What is the SI unit of electric current?

A. Watt

B. Ohm

C. Ampere ✓ Correct answer

D. Volt

Explanation: Electric current is measured in ampere (A).

Q3. Which instrument is used to measure electrical current in a circuit?

A. Voltmeter

B. Ammeter ✓ Correct answer

C. Megger

D. Wattmeter

Explanation: An ammeter is connected in series to measure current.

Q4. Which instrument is used to measure insulation resistance?

A. Wattmeter

B. Frequency meter

C. Energy meter

D. Megger ✓ Correct answer

Explanation: A megger is used for insulation resistance testing.

Q5. What is the main purpose of a fuse in an electrical circuit?

A. Measure current

B. Increase voltage

C. Improve power factor

D. Provide overcurrent protection ✓ Correct answer

Explanation: A fuse opens the circuit when excessive current flows.

Q6. Which device provides protection against earth leakage in a wiring installation?

A. Rheostat

B. Wattmeter

C. ELCB ✓ Correct answer

D. Transformer

Explanation: An ELCB is used to detect earth leakage and disconnect the supply.

Q7. What is the function of an MCB?

A. Store electrical energy

B. Protect against overcurrent and short circuit ✓ Correct answer

C. Change AC to DC

D. Measure insulation

Explanation: An MCB trips when an overcurrent or short circuit condition occurs.

Q8. Which joint is commonly made in a single strand conductor for a straight connection?

A. Britannia joint

B. Straight twist joint ✓ Correct answer

C. Tee joint

D. Married joint

Explanation: The syllabus specifically includes the simple straight twist joint for single strand conductors.

Q9. Which tool is used to make cable lug terminations by crimping?

A. Phase sequence meter

B. Crimping tool ✓ Correct answer

C. Megger

D. Frequency meter

Explanation: A crimping tool mechanically compresses the lug onto the conductor.

Q10. What is the purpose of soldering a conductor joint?

A. Increase cable length only

B. Increase insulation resistance

C. Provide a secure low-resistance electrical connection ✓ Correct answer

D. Reduce conductor size

Explanation: Soldering helps provide a secure electrical connection at the prepared joint.

Q11. Which law states that current is proportional to voltage when resistance remains constant?

A. Faraday's law

B. Lenz's law

C. Ohm's law ✓ Correct answer

D. Joule's law

Explanation: Ohm's law is V = I x R.

Q12. What is the resistance of an ideal short circuit?

A. One ohm

B. Infinite

C. Very high

D. Zero ✓ Correct answer

Explanation: An ideal short circuit has approximately zero resistance.

Q13. What happens to total resistance when resistors are connected in series?

A. It decreases below the smallest resistor

B. It is the sum of the resistances ✓ Correct answer

C. It becomes zero

D. It is always equal to the largest resistor

Explanation: For series resistors, total resistance is the sum of individual resistances.

Q14. What happens to equivalent resistance when identical resistors are connected in parallel?

A. It becomes infinite

B. It becomes equal to the sum

C. It becomes lower than each individual resistor ✓ Correct answer

D. It becomes greater than each resistor

Explanation: Parallel connection provides multiple current paths, reducing equivalent resistance.

Q15. Which bridge is included in the Electrician syllabus for measuring resistance?

A. Wheatstone bridge ✓ Correct answer

B. Schering bridge

C. Wien bridge

D. Maxwell bridge

Explanation: The syllabus specifically includes the Wheatstone bridge and its applications.

Q16. What is the main effect studied when current flows through a resistor?

A. Photoelectric effect only

B. Nuclear effect

C. Thermal effect ✓ Correct answer

D. Chemical effect only

Explanation: The syllabus includes determining the thermal effect of electric current.

Q17. Which device is used to store electrical charge in an electric circuit?

A. Contactor

B. Fuse

C. Capacitor ✓ Correct answer

D. Ammeter

Explanation: A capacitor stores electrical charge and is used in many electrical circuits.

Q18. What is the unit of capacitance?

A. Farad ✓ Correct answer

B. Tesla

C. Henry

D. Weber

Explanation: Capacitance is measured in farads (F).

Q19. Which law is associated with electromagnetic induction?

A. Ohm's law

B. Kirchhoff's current law

C. Faraday's law ✓ Correct answer

D. Coulomb's law

Explanation: Faraday's law describes electromagnetic induction.

Q20. What is produced when a current-carrying coil creates a magnetic field?

A. Chemical insulation

B. Mechanical friction

C. Only thermal insulation

D. Electromagnetic effect ✓ Correct answer

Explanation: A current-carrying coil produces a magnetic field and demonstrates the electromagnetic effect.

Q21. Which quantity represents the opposition offered by an AC circuit to current?

A. Impedance ✓ Correct answer

B. Conductance only

C. Charge

D. Capacitance only

Explanation: Impedance is the total opposition to AC current.

Q22. What is power factor?

A. Ratio of current to charge

B. Ratio of voltage to resistance

C. Ratio of active power to apparent power ✓ Correct answer

D. Ratio of energy to time only

Explanation: Power factor is active power divided by apparent power.

Q23. Which type of load normally causes lagging power factor?

A. Ideal capacitor

B. Inductive load ✓ Correct answer

C. Open circuit

D. Purely resistive load

Explanation: Inductive loads such as motors generally draw lagging current.

Q24. In a three-phase star connection, how is line voltage related to phase voltage for a balanced system?

A. VL = 3 x VP

B. VL = VP

C. VL = sqrt(3) x VP ✓ Correct answer

D. VL = VP / 3

Explanation: For a balanced star connection, line voltage is sqrt(3) times phase voltage.

Q25. In a balanced three-phase delta connection, how is line voltage related to phase voltage?

A. VL = sqrt(3) x VP

B. VL = VP / sqrt(3)

C. VL = 3 x VP

D. VL = VP ✓ Correct answer

Explanation: In a delta connection, line voltage equals phase voltage.

Q26. Which instrument is used to determine the phase sequence of a three-phase supply?

A. Phase sequence meter ✓ Correct answer

B. Energy meter

C. Megger

D. Ohmmeter

Explanation: A phase sequence meter identifies the sequence of the three phases.

Q27. What is the purpose of a neutral conductor in a three-phase four-wire system?

A. Increase frequency

B. Provide a return path for unbalanced current ✓ Correct answer

C. Act as a fuse

D. Reduce conductor length

Explanation: The neutral provides a return path for unbalanced loads in a four-wire system.

Q28. What is the basic purpose of connecting cells in series?

A. Remove internal resistance completely

B. Increase voltage ✓ Correct answer

C. Stop current flow

D. Decrease voltage only

Explanation: Series-connected cells add their voltages.

Q29. What is the basic purpose of connecting cells in parallel?

A. Create an open circuit

B. Always increase voltage

C. Eliminate charging

D. Increase available current capacity ✓ Correct answer

Explanation: Parallel grouping increases the available current capacity while maintaining the nominal voltage.

Q30. Which type of battery is specifically covered in the Electrician syllabus?

A. Silver oxide only

B. Lead-acid battery ✓ Correct answer

C. Nickel iron only

D. Lithium metal only

Explanation: The syllabus includes the lead-acid cell, its operation and components.

Q31. What is a basic safety requirement while charging a battery?

A. Remove all ventilation

B. Short the terminals

C. Ignore polarity

D. Follow correct polarity and safety precautions ✓ Correct answer

Explanation: Correct polarity and safe charging practices are essential.

Q32. Which wiring system uses PVC conduit as the protective route for wires?

A. Conduit wiring ✓ Correct answer

B. Open bare wiring

C. Busbar-only wiring

D. Twisted wire only

Explanation: PVC conduit wiring routes and protects conductors inside conduit.

Q33. What is the purpose of a distribution board in an electrical installation?

A. Generate electricity

B. Store mechanical energy

C. Measure temperature

D. Distribute and protect outgoing circuits ✓ Correct answer

Explanation: A distribution board distributes supply to sub-circuits and houses protective devices.

Q34. Which device is specifically listed with MCB and MCCB as a wiring protection device?

A. Thermometer

B. Tachometer

C. Oscilloscope

D. ELCB ✓ Correct answer

Explanation: ELCB is included among wiring accessories and protection devices in the syllabus.

Q35. What does a domestic two-way switching arrangement allow?

A. Convert AC to DC

B. Measure insulation

C. Control one lamp from two locations ✓ Correct answer

D. Control current frequency

Explanation: Two-way switching allows a lamp to be controlled from two different locations.

Q36. What is the purpose of earthing an electrical installation?

A. Store electrical charge

B. Increase supply frequency

C. Increase lamp brightness only

D. Provide a safe path for fault current and reduce shock risk ✓ Correct answer

Explanation: Earthing provides a low-resistance fault path and improves electrical safety.

Q37. Which equipment is used to measure earth electrode resistance?

A. Energy meter

B. Frequency meter

C. Wattmeter

D. Earth tester ✓ Correct answer

Explanation: The syllabus specifies an earth tester or megger for measuring earth resistance.

Q38. Which type of earthing is explicitly covered in the syllabus?

A. Water-only earthing

B. Chemical-only earthing

C. Pipe earthing ✓ Correct answer

D. Magnetic earthing

Explanation: Pipe earthing is one of the earthing methods covered.

Q39. Which lamp type is included in the illumination training?

A. High pressure mercury vapour lamp ✓ Correct answer

B. Only neon indicator

C. Only LED strip

D. Only halogen torch

Explanation: The syllabus includes HPMV and other lamp types such as sodium vapour and metal halide.

Q40. What is the purpose of a reflector in a lighting installation?

A. Direct light toward the required area ✓ Correct answer

B. Increase conductor resistance

C. Protect a fuse

D. Measure current

Explanation: Reflectors help direct light for the required illumination.

Q41. Which part of a DC machine is used to collect current from the rotating armature?

A. Commutator ✓ Correct answer

B. Contactor

C. Capacitor

D. Slip ring only

Explanation: A commutator provides mechanical rectification and current collection in a DC machine.

Q42. What is the function of the brushes in a DC machine?

A. Control illumination

B. Store charge

C. Increase supply frequency

D. Provide electrical contact with the rotating commutator ✓ Correct answer

Explanation: Brushes maintain electrical contact with the commutator.

Q43. What is the main purpose of a DC motor starter?

A. Limit starting current and provide safe starting control ✓ Correct answer

B. Measure power factor

C. Generate three-phase supply

D. Increase insulation resistance

Explanation: A starter limits excessive starting current and provides control/protection.

Q44. Which DC motor starter is specifically covered in the syllabus?

A. Rotor resistance starter only

B. Star-delta starter only

C. DOL starter only

D. Three-point starter ✓ Correct answer

Explanation: The syllabus covers three-point and four-point DC motor starters.

Q45. Which test is used to check insulation resistance of a DC machine?

A. Phase sequence test

B. Power factor test only

C. Insulation resistance test using a megger ✓ Correct answer

D. Open circuit voltage only

Explanation: The syllabus requires testing continuity and insulation resistance of DC machines.

Q46. What is back EMF in a DC motor?

A. A fuse voltage

B. An induced EMF that opposes the applied voltage ✓ Correct answer

C. The supply frequency

D. The earth leakage current

Explanation: Back EMF is induced in the armature and opposes the applied voltage.

Q47. Which methods are included for DC motor speed control?

A. Field control and armature control ✓ Correct answer

B. Only neutral control

C. Only earthing control

D. Only fuse control

Explanation: The syllabus explicitly includes field and armature control methods.

Q48. What is the purpose of a growler in DC machine maintenance?

A. Testing the armature for faults ✓ Correct answer

B. Testing lamp brightness

C. Measuring supply frequency

D. Measuring earth resistance

Explanation: A growler is used to test armatures for faults such as shorted coils.

Q49. Which winding methods are covered for DC machines?

A. Only concentric AC winding

B. Only delta winding

C. Lap and wave winding ✓ Correct answer

D. Only star winding

Explanation: The syllabus includes lap and wave winding and related terms.

Q50. Which motor is commonly known for using a squirrel-cage rotor?

A. DC shunt motor

B. Universal motor only

C. Synchronous generator

D. Three-phase induction motor ✓ Correct answer

Explanation: The squirrel-cage induction motor uses a squirrel-cage rotor.

Q51. What is slip in an induction motor?

A. Frequency of DC supply

B. Difference between voltage and current only

C. Resistance of a cable

D. Difference between synchronous speed and rotor speed expressed relative to synchronous speed ✓ Correct answer

Explanation: Slip represents the relative speed difference between the rotating field and rotor.

Q52. Which starter is used to reduce the starting voltage/current of a three-phase induction motor by connecting the motor initially in star?

A. Star-delta starter ✓ Correct answer

B. Rotor resistance starter

C. DOL starter

D. Three-point starter

Explanation: A star-delta starter starts the motor in star and then changes to delta.

Q53. What is the main advantage of a DOL starter?

A. It always gives zero starting current

B. It converts AC to DC

C. Simple direct connection and simple control ✓ Correct answer

D. It eliminates all protection

Explanation: DOL starters are simple and directly connect the motor to the supply, with suitable protection.

Q54. Which starter is specifically used with a slip-ring induction motor in the syllabus?

A. Star-delta only

B. Capacitor starter

C. Rotor resistance starter ✓ Correct answer

D. Three-point starter

Explanation: The syllabus includes starting a slip-ring motor through a rotor resistance starter.

Q55. What happens during single phasing of a three-phase motor?

A. The motor can draw abnormal current and may overheat ✓ Correct answer

B. The voltage becomes DC

C. The motor becomes an alternator

D. The motor always runs normally

Explanation: Single phasing can cause overheating and abnormal operation, so prevention is important.

Q56. Which test is used to determine induction motor efficiency along with other tests in the syllabus?

A. Only insulation test

B. Only phase sequence test

C. No-load and blocked-rotor tests ✓ Correct answer

D. Only earth test

Explanation: The syllabus includes no-load and blocked-rotor tests for induction motor performance.

Q57. What is the purpose of an AC motor starter?

A. Increase lamp intensity

B. Store energy

C. Provide controlled starting and protection ✓ Correct answer

D. Measure insulation only

Explanation: Motor starters provide controlled starting and protective functions.

Q58. Which motor can operate on either AC or DC supply?

A. Squirrel-cage motor

B. DC shunt motor only

C. Universal motor ✓ Correct answer

D. Synchronous motor only

Explanation: A universal motor is designed to operate on both AC and DC.

Q59. What is an alternator used for?

A. Generating AC electrical power ✓ Correct answer

B. Storing charge

C. Measuring resistance

D. Protecting a circuit

Explanation: An alternator converts mechanical energy into AC electrical energy.

Q60. What determines the frequency generated by an alternator along with speed?

A. Number of poles ✓ Correct answer

B. Cable diameter

C. Earth resistance

D. Fuse rating

Explanation: Alternator frequency depends on rotational speed and number of poles.

Q61. What is the purpose of synchronizing alternators before parallel operation?

A. Disconnect the neutral

B. Increase resistance

C. Match required voltage, frequency, phase sequence and phase relationship ✓ Correct answer

D. Reduce cable size

Explanation: Correct synchronization conditions are required before connecting alternators in parallel.

Q62. Which instrument can be used for synchronization of alternators?

A. Megger

B. Ohmmeter

C. Watt-hour meter

D. Synchroscope ✓ Correct answer

Explanation: The syllabus specifically includes parallel operation using a synchroscope.

Q63. What is a synchronous motor V-curve related to?

A. Cable length versus voltage

B. Armature current versus field excitation ✓ Correct answer

C. Resistance versus temperature only

D. Power versus earth resistance

Explanation: V-curves show the relationship between armature current and excitation at a given load.

Q64. What is the purpose of power factor improvement in a synchronous motor?

A. Operate with suitable excitation to improve power factor ✓ Correct answer

B. Increase earth resistance

C. Change DC into AC

D. Reduce insulation thickness

Explanation: Synchronous motor excitation can be adjusted for power factor improvement.

Q65. What is the function of a diode in a rectifier circuit?

A. Measure frequency

B. Store mechanical energy

C. Protect against earth leakage only

D. Allow current mainly in one direction for rectification ✓ Correct answer

Explanation: A diode conducts primarily in one direction and is used for rectification.

Q66. Which rectifier uses four diodes in a bridge arrangement?

A. Single-diode rectifier

B. Bridge rectifier ✓ Correct answer

C. Half-wave rectifier

D. Mechanical rectifier

Explanation: A conventional single-phase bridge rectifier uses four diodes.

Q67. What is the purpose of a filter after a rectifier?

A. Increase ripple

B. Reduce ripple in the rectified output ✓ Correct answer

C. Reverse motor direction

D. Measure insulation

Explanation: Filters smooth the pulsating DC output by reducing ripple.

Q68. Which component is classified as an active electronic component?

A. Capacitor

B. Resistor

C. Inductor

D. Transistor ✓ Correct answer

Explanation: A transistor is an active semiconductor device.

Q69. What is a transistor commonly used as in the syllabus?

A. Energy meter only

B. Fuse only

C. Earth electrode

D. Switch and amplifier ✓ Correct answer

Explanation: The syllabus includes transistor applications as a switch, voltage regulator and amplifier.

Q70. What is the purpose of an SCR in power control?

A. Measure frequency

B. Control power by controlled switching ✓ Correct answer

C. Store AC energy

D. Measure resistance

Explanation: An SCR is a controlled semiconductor switch used in power control.

Q71. Which device is paired with SCR in the syllabus for power control circuits?

A. DIAC ✓ Correct answer

B. Megger

C. Ammeter

D. Thermometer

Explanation: The syllabus covers SCR, DIAC, TRIAC and IGBT power-control devices.

Q72. Which semiconductor device is commonly used for bidirectional AC power control?

A. Zener diode only

B. TRIAC ✓ Correct answer

C. Diode

D. Photodiode

Explanation: A TRIAC is a bidirectional device commonly used for AC power control.

Q73. What is the main purpose of an IGBT in power electronics?

A. Measure cable diameter

B. Measure earth resistance

C. Store mechanical energy

D. High-speed controlled switching and power conversion ✓ Correct answer

Explanation: IGBTs are power switching devices used in power electronic converters and drives.

Q74. What does CRO stand for in electrical measurement?

A. Cathode Ray Oscilloscope ✓ Correct answer

B. Control Relay Operator

C. Current Resistance Output

D. Cable Reading Oscillator

Explanation: CRO stands for Cathode Ray Oscilloscope.

Q75. What can a CRO be used to observe?

A. Cable weight

B. Earth electrode depth only

C. Mechanical torque only

D. Electrical waveforms ✓ Correct answer

Explanation: A CRO is used to observe and measure electrical waveforms.

Q76. Which device is used for AC motor speed control in the syllabus?

A. Energy meter

B. Fuse

C. AC drive / VVVF drive ✓ Correct answer

D. Megger

Explanation: The syllabus includes AC drive and VVVF control for three-phase induction motor speed control.

Q77. What is the purpose of a DC drive?

A. Control the speed of a DC motor ✓ Correct answer

B. Measure earth resistance

C. Test cable insulation only

D. Generate illumination

Explanation: A DC drive controls the operating speed of a DC motor.

Q78. What is the basic function of an inverter?

A. Measure resistance

B. Convert AC power into DC only

C. Improve earth resistance

D. Convert DC power into AC power ✓ Correct answer

Explanation: An inverter converts DC electrical power into AC power.

Q79. What is the purpose of a UPS?

A. Measure frequency only

B. Provide backup power to connected loads ✓ Correct answer

C. Increase conductor length

D. Protect only against mechanical vibration

Explanation: A UPS supplies backup power and helps maintain continuity during supply interruptions.

Q80. What is the basic function of a voltage stabilizer?

A. Convert mechanical energy to electrical energy

B. Measure insulation resistance

C. Maintain output voltage within a desired range ✓ Correct answer

D. Store current

Explanation: A stabilizer regulates voltage to keep the output within an acceptable range.

Q81. Which renewable source is explicitly included in the Electrician syllabus?

A. Only diesel

B. Solar energy ✓ Correct answer

C. Only coal

D. Only petrol

Explanation: The syllabus includes solar and wind power generation and solar panel installation.

Q82. What is the function of an insulator on an overhead line?

A. Measure voltage

B. Support the conductor while electrically isolating it from the structure ✓ Correct answer

C. Store charge

D. Increase current flow to earth

Explanation: Line insulators mechanically support conductors and electrically isolate them from poles or structures.

Q83. Which system is used to distribute electrical power from generation/transmission toward consumers?

A. Rectifier circuit

B. Battery charger

C. Motor winding

D. Distribution network ✓ Correct answer

Explanation: Distribution networks deliver electrical power to consumer supply points.

Q84. What is the purpose of a relay in a protection/control circuit?

A. Generate illumination

B. Operate a control function in response to an electrical condition ✓ Correct answer

C. Measure cable diameter

D. Store mechanical energy

Explanation: Relays operate contacts in response to control or protection conditions.

Q85. What is the purpose of a circuit breaker?

A. Measure resistance continuously

B. Store energy

C. Generate power

D. Interrupt current during abnormal conditions and provide switching ✓ Correct answer

Explanation: Circuit breakers interrupt current during faults such as overcurrent or short circuit.

Q86. What is arc quenching in a circuit breaker?

A. Measuring current

B. Increasing the arc length permanently

C. Extinguishing the electrical arc formed when contacts separate ✓ Correct answer

D. Charging a battery

Explanation: Arc quenching safely extinguishes the arc produced during contact separation.

Q87. What is the main purpose of an EV charging station?

A. Supply electrical energy to charge an electric vehicle battery ✓ Correct answer

B. Generate petrol

C. Measure earth resistance only

D. Convert an EV into a generator

Explanation: An EV charging station supplies electrical energy to charge the vehicle battery.

Q88. Which safety requirement is important during EV charger installation?

A. Follow electrical protection and charging safety requirements ✓ Correct answer

B. Bypass protective devices

C. Ignore earthing

D. Use damaged cables

Explanation: The syllabus explicitly includes EV charging safety requirements.

Q89. Which device is used to control a motor circuit by electrically operated contacts?

A. Energy meter

B. Fuse wire

C. Megger

D. Contactor ✓ Correct answer

Explanation: A contactor is an electrically operated switching device commonly used in motor control circuits.

Q90. What is the purpose of a timer in a motor control panel?

A. Generate electrical energy

B. Measure earth resistance

C. Measure cable size

D. Provide time-based switching/control ✓ Correct answer

Explanation: Timers provide time-based control sequences in control circuits.

Q91. What is a DIN rail used for in a control cabinet?

A. Improve power factor

B. Store electrical charge

C. Measure voltage

D. Mount control components and accessories ✓ Correct answer

Explanation: DIN rails provide standardized mounting for control and protection components.

Q92. What is the purpose of ferrules in control-panel wiring?

A. Protect against lightning only

B. Provide a neat termination for stranded wires ✓ Correct answer

C. Convert AC to DC

D. Measure frequency

Explanation: Ferrules terminate stranded wire ends neatly for reliable terminal connections.

Q93. What is the main purpose of a control cabinet?

A. House and interconnect control and protection components ✓ Correct answer

B. Generate electricity directly

C. Measure earth resistance only

D. Store mechanical tools only

Explanation: A control cabinet contains control, switching, protection and related wiring components.

Q94. Which motor control function is specifically covered using control-cabinet wiring?

A. Forward and reverse operation ✓ Correct answer

B. Only transformer oil testing

C. Only battery charging

D. Only lighting control

Explanation: The syllabus includes forward/reverse control of induction motors.

Q95. What is sequential motor control?

A. Charging a battery

B. Starting or operating motors in a defined sequence ✓ Correct answer

C. Measuring motor insulation only

D. Running all motors without control

Explanation: Sequential control operates multiple motors according to a defined order or logic.

Q96. What is the purpose of a potential transformer (PT)?

A. Provide a reduced proportional voltage for measurement/protection ✓ Correct answer

B. Store energy

C. Measure earth resistance directly

D. Increase cable current

Explanation: A PT provides a reduced voltage suitable for measurement and protection circuits.

Q97. What is transformer voltage regulation?

A. Earth resistance of the transformer

B. Current in a fuse

C. Change in frequency due to cable length

D. Change in secondary voltage between specified load conditions ✓ Correct answer

Explanation: Voltage regulation describes the change in secondary voltage between no-load and load conditions.

Q98. Which transformer test is used to determine core and copper-loss related performance parameters?

A. CRO test only

B. Open-circuit and short-circuit tests ✓ Correct answer

C. Earth electrode test

D. Phase sequence test only

Explanation: The syllabus includes OC and SC tests for determining transformer performance and efficiency.

Q99. What is an auto-transformer?

A. A transformer with a common portion of winding shared by primary and secondary ✓ Correct answer

B. A motor starter

C. A circuit breaker

D. A rectifier

Explanation: An auto-transformer uses a common winding section for input and output.

Q100. Why is transformer oil tested?

A. To check its condition and insulating properties ✓ Correct answer

B. To measure motor speed

C. To measure cable diameter

D. To determine phase sequence

Explanation: Transformer oil is used for insulation and cooling, so its condition is tested.

Frequently asked questions

Is this Electrician ITI quiz based on the official syllabus?

The questions follow the topics of the DGT CTS 2.0 curriculum for the trade. Always check the latest syllabus and your state or institute notices, because trade lists and weightage can change.

How many questions are there and how are they marked?

There are 100 multiple-choice questions with one correct option each. The quiz shows your score at the end; there is no negative marking on this practice page.

How can I use the explanations?

After each answer read the explanation, note the fact in your own words, and revisit the questions you missed in the answer key below. Repeating the set after a few days works better than reading it once.

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Electrician ITI 100 MCQ Test | DGT CTS 2.0 Interview Questions

Electrician ITI - 100 Technical MCQ

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