Single-Phase Induction Motor MCQ Test Part-01

#1. What is a single-phase induction motor?

a) A motor that works on three-phase power

b) A motor that works on single-phase power

c) A motor with only one winding

d) A motor that does not require a capacitor

#2. In a single-phase induction motor, the current in the stator windings is:

a) Alternating current

b) Direct current

c) Pulsating current

d) Constant current

#3. Which of the following is the primary disadvantage of a single-phase induction motor?

a) It requires a capacitor for starting

b) It has a low starting torque

c) It operates on DC power

d) It is more expensive than a three-phase motor

#4. What is the main component that provides the rotating magnetic field in a single-phase induction motor?

a) Rotor

b) Stator

c) Capacitor

d) Both stator and rotor

#5. The starting torque of a single-phase induction motor is typically:

a) High

b) Low

c) Zero

d) Variable

#6. Which of the following is used to improve the starting torque of a single-phase induction motor?

a) Capacitor

b) Resistor

c) Inductor

d) Battery

#7. What type of current does a single-phase induction motor operate on?

a) Direct current (DC)

b) Alternating current (AC)

c) Pulsating current

d) Constant current

#8. The torque in a single-phase induction motor is produced by:

a) Direct current

b) Eddy currents

c) The rotating magnetic field

d) The interaction of stator and rotor winding

#9. The speed of a single-phase induction motor is primarily determined by:

a) Supply voltage

b) Rotor resistance

c) Supply frequency

d) Motor size

#10. What is the usual starting method of a small single-phase induction motor?

a) DOL (Direct-on-line) start

b) Star-delta start

c) Split-phase start

d) Autotransformer start

#11. What is the purpose of a capacitor in a single-phase induction motor?

a) To provide high torque

b) To create a phase shift between the current in the windings

c) To reduce energy consumption

d) To control the motor speed

#12. What is the principle of operation of a single-phase induction motor?

a) Faraday's Law of Induction

b) Lenz's Law

c) Fleming's Left-hand Rule

d) Electromagnetic Induction

#13. In a capacitor-start induction motor, the capacitor is placed in:

a) The rotor circuit

b) The stator winding circuit

c) The auxiliary winding

d) The main winding

#14. Which of the following is NOT a type of single-phase induction motor?

a) Capacitor-start motor

b) Capacitor-run motor

c) Split-phase motor

d) Squirrel cage motor

#15. What happens when the capacitor in a capacitor-start motor is disconnected after starting?

a) The motor continues to run

b) The motor stops

c) The motor runs at a higher speed

d) The motor runs at low efficiency

#16. Which part of a single-phase induction motor provides the starting torque?

a) Rotor

b) Stator

c) Capacitor

d) Auxiliary winding

#17. In a shaded pole motor, the rotor is:

a) Stationary

b) Semi-permanent

c) Squirrel-cage type

d) Open-circuit type

#18. Which of the following is a common application of a single-phase induction motor?

a) Industrial machines

b) Household appliances

c) Large pump stations

d) Power generation plants

#19. In a single-phase induction motor, the number of poles in the stator determines:

a) The starting torque

b) The efficiency

c) The synchronous speed

d) The current rating

#20. In a split-phase motor, the two windings are:

a) Connected in series

b) Connected in parallel

c) At 90 degrees to each other

d) Identical in resistance

#21. In a capacitor-run motor, the capacitor is used:

a) Only during starting

b) Continuously during operation

c) For speed regulation

d) For rotor cooling

#22. The power factor of a single-phase induction motor is generally:

a) High and constant

b) Low and constant

c) Low and variable

d) High and variable

#23. A single-phase induction motor requires a _______ for generating a rotating magnetic field.

a) Three-phase supply

b) Capacitor

c) Permanent magnet

d) Phase-splitting mechanism

#24. Which of the following is true about the efficiency of a single-phase induction motor?

a) It is always very high

b) It depends on the type of motor and load

c) It is independent of load

d) It decreases with increasing voltage

#25. The rotor of a single-phase induction motor:

a) Must be fed by external current

b) Always rotates in the same direction

c) Is electromagnetically induced

d) Requires an external power supply

#26. Which of the following methods is commonly used to improve the power factor of a single-phase induction motor?

a) Using a higher voltage

b) Connecting a capacitor in parallel with the motor

c) Reducing the number of poles

d) Increasing the motor size

#27. What type of power is required to start a split-phase motor?

a) Single-phase AC power

b) Three-phase AC power

c) DC power

d) Pulse power

#28. A shaded pole motor typically has:

a) High starting torque

b) Low efficiency

c) No rotor losses

d) High speed regulation

#29. The main disadvantage of a shaded pole motor is:

a) High starting current

b) Low efficiency and low torque

c) Complex winding structure

d) High cost of operation

#30. The speed regulation of a single-phase induction motor is:

a) Very precise and constant

b) Poor and varies with load

c) Dependent on supply voltage

d) High in both loaded and unloaded conditions

Finish

Results