50 Most Important Questions for ITI Electrician CBT Exam

These questions cover various aspects of NCVT MIS ITI electrical theory, components, devices, and their applications. Make sure to thoroughly understand the concepts behind each question and its correct answer. According To the latest NIMI Pattern.

50 Most Important Electrician Questions

What is the SI unit of electric charge?
- a) Ampere
- b) Volt
- c) Coulomb (Correct answer)
- d) Ohm
What is the function of a circuit breaker in an electrical circuit?
- a) To regulate voltage
- b) To store electrical energy
- c) To interrupt the flow of current (Correct answer)
- d) To convert AC to DC
Which of the following materials is a good conductor of electricity?
- a) Glass
- b) Rubber
- c) Copper (Correct answer)
- d) Plastic
What is the purpose of an inductor in an electrical circuit?
- a) To store electrical energy
- b) To regulate the current flow
- c) To provide mechanical support
- d) To oppose changes in current flow (Correct answer)
What is the unit of electric potential difference?
- a) Ampere
- b) Ohm
- c) Volt (Correct answer)
- d) Watt
What is the purpose of a diode in an electrical circuit?
- a) To amplify electrical signals
- b) To store electrical energy
- c) To control the direction of current flow (Correct answer)
- d) To regulate voltage
What is the function of a capacitor in an electrical circuit?
- a) To measure electrical resistance
- b) To store electrical energy (Correct answer)
- c) To regulate the current flow
- d) To amplify electrical signals
What is the SI unit of electrical power?
- a) Ampere
- b) Volt
- c) Watt (Correct answer)
- d) Ohm
Which device is used to measure electrical resistance?
- a) Ammeter
- b) Voltmeter
- c) Ohmmeter (Correct answer)
- d) Multimeter
What is the purpose of a fuse in an electrical circuit?
- a) To regulate current flow
- b) To store electrical energy
- c) To provide insulation
- d) To protect against overcurrent (Correct answer)
What is the function of a relay in an electrical circuit?
- a) To convert AC to DC
- b) To amplify electrical signals
- c) To control high-power circuits using low-power circuits (Correct answer)
- d) To regulate voltage
What is the unit of electrical resistance?
- a) Ampere
- b) Ohm (Correct answer)
- c) Volt
- d) Watt
What does the term “AC” stand for in AC power supply?
- a) Alternating Current (Correct answer)
- b) Ampere Current
- c) Applied Current
- d) Active Current
What does the term “DC” stand for in DC power supply?
- a) Direct Current (Correct answer)
- b) Double Current
- c) Discharge Current
- d) Dynamic Current
What is the main function of a transformer?
- a) To convert AC to DC
- b) To store electrical energy
- c) To regulate voltage (Correct answer)
- d) To provide insulation
Which type of motor is commonly used in household appliances?
- a) Induction motor
- b) DC motor
- c) Universal motor (Correct answer)
- d) Synchronous motor
What is the unit of electrical energy?
- a) Ampere
- b) Volt
- c) Watt
- d) Joule (Correct answer)
Which device is used to measure electrical voltage?
- a) Ammeter
- b) Voltmeter (Correct answer)
- c) Ohmmeter
- d) Multimeter
What is the purpose of an insulator in an electrical circuit?
- a) To regulate current flow
- b) To store electrical energy
- c) To provide mechanical support
- d) To prevent the flow of electric current (Correct answer)
Which material is commonly used as a good insulator of electricity?
- a) Copper
- b) Silver
- c) Aluminum
- d) Rubber (Correct answer)
What is the purpose of an earth wire in an electrical circuit?
- a) To regulate voltage
- b) To store electrical energy
- c) To provide insulation
- d) To protect against electric shock (Correct answer)
What is the purpose of a three-pin plug in an electrical circuit?
- a) To convert AC to DC
- b) To regulate voltage
- c) To provide mechanical support
- d) To ensure proper grounding and safety (Correct answer)
What is the purpose of a resistor in an electrical circuit?
- a) To amplify electrical signals
- b) To store electrical energy
- c) To regulate current flow
- d) To control the amount of current in a circuit (Correct answer)
Which component is used to step up or step down voltage in a circuit?
- a) Transistor
- b) Transformer (Correct answer)
- c) Capacitor
- d) Inductor
What is the purpose of a ground fault circuit interrupter (GFCI) in electrical installations?
- a) To regulate voltage
- b) To store electrical energy
- c) To provide mechanical support
- d) To protect against electric shock (Correct answer)
Which component is used to convert mechanical energy into electrical energy?
- a) Transformer
- b) Capacitor
- c) Generator (Correct answer)
- d) Inductor
What is the function of an oscilloscope in electrical measurements?
- a) To measure voltage
- b) To measure current
- c) To visualize waveforms (Correct answer)
- d) To measure resistance
What is the purpose of a surge protector in an electrical circuit?
- a) To regulate voltage
- b) To store electrical energy
- c) To provide mechanical support
- d) To protect against voltage spikes (Correct answer)
What is the function of a solenoid in an electrical circuit?
- a) To amplify electrical signals
- b) To store electrical energy
- c) To convert electrical energy into mechanical motion (Correct answer)
- d) To regulate voltage
What is the unit of electric current?
- a) Ampere (Correct answer)
- b) Volt
- c) Ohm
- d) Watt
What is the purpose of a rectifier in an electrical circuit?
- a) To convert AC to DC (Correct answer)
- b) To amplify electrical signals
- c) To store electrical energy
- d) To regulate voltage
What is the function of a potentiometer in an electrical circuit?
- a) To measure current
- b) To measure voltage
- c) To control the flow of current (Correct answer)
- d) To regulate voltage
Which component is used to convert electrical energy into mechanical motion?
- a) Transformer
- b) Capacitor
- c) Motor (Correct answer)
- d) Inductor
What is the purpose of a varistor in an electrical circuit?
- a) To regulate voltage
- b) To store electrical energy
- c) To protect against voltage surges (Correct answer)
- d) To amplify electrical signals
What is the purpose of a thyristor in an electrical circuit?
- a) To convert AC to DC
- b) To store electrical energy
- c) To control the flow of current (Correct answer)
- d) To regulate voltage
Which component is used to protect electrical equipment from excessive current?
- a) Transformer
- b) Capacitor
- c) Fuse (Correct answer)
- d) Inductor
What is the purpose of a motor starter in an electrical circuit?
- a) To convert AC to DC
- b) To amplify electrical signals
- c) To control the starting and stopping of a motor (Correct answer)
- d) To regulate voltage
What is the unit of power factor?
- a) Amperes
- b) Volts
- c) Ohms
- d) None of the above, power factor is a dimensionless quantity (Correct answer)
What is the purpose of a power factor correction capacitor in an electrical circuit?
- a) To regulate voltage
- b) To store electrical energy
- c) To improve the power factor (Correct answer)
- d) To protect against overcurrent
Which type of motor is commonly used in electric fans?
- a) Induction motor (Correct answer)
- b) DC motor
- c) Universal motor
- d) Synchronous motor
What is the function of a phase sequence indicator in electrical installations?
- a) To measure voltage
- b) To measure current
- c) To identify the sequence of phases (Correct answer)
- ) To measure resistance
What is the purpose of a surge arrester in an electrical circuit?
- a) To regulate voltage
- b) To store electrical energy
- c) To protect against voltage surges (Correct answer)
- d) To amplify electrical signals
Which type of motor is commonly used in elevators?
- a) Induction motor
- b) DC motor
- c) Synchronous motor
- d) Traction motor (Correct answer)
What is the purpose of a power transformer in electrical systems?
- a) To convert AC to DC
- b) To store electrical energy
- c) To step up or step down voltage (Correct answer)
- d) To regulate current flow
What is the function of a lightning arrester in electrical installations?
- a) To regulate voltage
- b) To store electrical energy
- c) To protect against lightning strikes (Correct answer)
- d) To amplify electrical signals
Which component is used to control the speed of an electric motor?
- a) Transformer
- b) Capacitor
- c) Variable frequency drive (Correct answer)
- d) Inductor
What is the purpose of a motor protection relay in an electrical circuit?
- a) To convert AC to DC
- b) To amplify electrical signals
- c) To protect the motor from overload and faults (Correct answer)
- d) To regulate voltage
What is the function of a phase sequence relay in electrical installations?
- a) To measure voltage
- b) To measure current
- c) To monitor the correct sequence of phases (Correct answer)
- d) To measure resistance
Which component is used to measure electrical frequency?
- a) Transformer
- b) Capacitor
- c) Frequency meter (Correct answer)
- d) Inductor
What is the purpose of a shunt capacitor in power factor improvement?
- a) To regulate voltage
- b) To store electrical energy
- c) To compensate for reactive power (Correct answer)
- d) To protect against overcurrent

50 Most Important Electrician Questions

Electrician Chapter Wise Mock Test