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Three Phase Induction Motor Question & Answers

March 3, 2023 By Wat Electrical

This article lists 75 Three Phase Induction Motor MCQs for engineering students. All the Three Phase Induction Motor Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of the Three Phase Induction Motor.

The three-phase induction motors are self-starting motors that run at a constant speed from zero to load. The frame, stator, stator winding, rotor winding, cooling fan, and bearings are the components of three phase induction motor. 

The stator is a stationary part of an induction motor that consists of a stator winding. The rotor in a three-phase induction is housed on the shaft of an induction motor. The stator current control and stator voltage control are the methods of speed control of an induction motor.

The rotor in a three-phase induction motor has two ends one is called the non-driving end and another is called the driving end. Induction motors are widely used power drive that runs at a constant speed. The constant or fixed losses and variable losses are the losses that occur in three phase induction motor. 

The three-phase induction motors are simple to design, low cost requires minimum maintenance, and has high efficiency & good pf at full load. The squirrel cage induction motor and slip ring induction motors are the type of three-phase induction motors. 

1). The armature of both synchronous and DC machines is an example of __________________ winding?

Hint
2). Which one of the following windings is also known as Un bifurcated winding?

Hint
3). The hemitropic winding is a type of winding comes under _______________ winding?

Hint
4). The integral slot and fractional slot come under _______________ winding?

Hint
5). Which one of the following motors always run with lagging power factor?

Hint
6). The power range of single-phase squirrel cage motor is _______________?

Hint
7). The direct-on-line, star delta are the starting methods of an ___________________ induction motor?


Hint
8). The figure shown below is a configuration of derive system for two phase ____________ motor?

Configuration of Derive System for Two Phase Induction Motor

Hint
9). Which one of the following starting methods for induction motor is simple and inexpensive?

Hint
10). Which one of the following one controls the motor throughout its operation?

Hint
11). Which one of the following starting methods for an induction motor has advantage of reduced in rush current and voltage dip?

Hint
12). The smooth acceleration is an advantage of _________________ starting method of an IM?

Hint
13). The load on the motor is a cause of _________________ losses?

Hint
14). Which one of the following is also known as mesh connection?

Hint
15). Which one of the following windings is also called double layer winding?

Hint
16). Which one of the following brakes is classified based on drivers' ergonomics?

Hint
17). ________________ is a type of brake based on basis of actuating method?

Hint
18). The efficiency and power factor are high in ________________ induction motor?

Hint
19). The permanent single capacitor induction motor is a __________________ phase technique?

Hint
20). Which one of the following is used only for motor start and stop control?

Hint

Three Phase Induction Motor MCQ for Exams

21). The power range of three-phase squirrel cage motor is _______________?

Hint
22). The smooth acceleration, reduced mechanical stress are the advantage of _______________ starting method?

Hint
23). What are the characteristics of brake fluid?

Hint
24). The transient response is fast in ________________ induction motor?

Hint
25). What are the reasons of an insulation failure in winding burning?

Hint
26). Which one of the following brakes is classified based on location in the vehicle?

Hint
27). Which one of the following is a type of brake based on application of braking effort?

Hint
28). What are the components of drum type brake system?

Hint
29). The figure shown below is a ____________ phase induction motor?

Three Phase Induction Motor

Hint
30). Which one of the following starters does not decreases the starting current?

Hint
31). What are the advantages of three phase induction motor?

Hint
32). Which class squirrel cage induction motor used for driving intermittent load?

Hint
33). What is the standard form of DFIG?

Hint
34). What are the methods of speed control of an induction motor?

Hint
35). _________________ are the parts of regenerative braking system?

Hint
36). Which one of the following brakes is classified based on purpose served?

Hint
37). The internal expanding brakes classified based on ___________________?

Hint
38). Which one of the following is a type of brake based on construction?

Hint
39). The figure shown below is a circuit diagram of phase ____________ motor?

Split Phase Induction Motor

Hint
40). What is the standard form of ABS?

Hint

Three Phase Induction Motor MCQ for Quiz

41). The starting torque is low in ___________________ starting method of an IM?

Hint
42). The current flowing through the stator and rotor winding are _______________ losses?

Hint
43). What is the standard form of DFIM?

Hint
44). The production cost and torque to current ratio is lower in ________________?

Hint
45). What are the reasons of a frame related mechanical failure?

Hint
46). The starting current is very high in ___________________ starting method of an IM?

Hint
47). The fluctuation in the magnetic field is a cause of _______________ losses?

Hint
48). What are the disadvantages of delta connection?

Hint
49). The figure shown below is a circuit diagram of phase ____________ motor?

Permanent Split Capacitor Motor

Hint
50). The primary and secondary windings of a transformer is an example of ________________ winding?

Hint
51). What are the reasons of winding burning?

Hint
52). The movement of the rotor and air resistance is a cause of _______________ losses?

Hint
53). The rotor copper loss comes under _______________ losses?

Hint
54). What are the advantages of delta connection?

Hint
55). What are the reasons of a bearing failure in winding burning?

Hint
56). Which class squirrel cage induction motor used for compressor?

Hint
Read more about Induction Motor
57). The reduced in rush current, voltage dip and low cost are the advantages of _____________ starting method?

Hint
58). The energy efficiency is high in ___________________ starting method of an IM?

Hint
59). The figure shown below is a circuit diagram of phase ____________ motor?

Two Value Capacitor Motor

Hint
60). Which one of the following windings used for AC commutator machines and DC machines?

Hint

Three Phase Induction Motor MCQ for Interviews

61). What are the reasons of a rotor related mechanical failure?

Hint
62). Which class squirrel cage induction motor used for constant speed drive such as pump, and blower?

Hint
63). The precise speed control and energy saving are the advantages of ______________ starting method?

Hint
64). The mechanical stress is high in ___________________ starting method of an IM?

Hint
65). The interaction between stator and rotor is a cause of _________________ losses?

Hint
66). Which one of the following is also known as star connection?

Hint
67). The stator iron loss comes under _______________ losses?

Hint
68). The figure shown below is a circuit diagram of ____________ motor?

Shaded Pole Motor

Hint
69). The constant power mode of operation is average in _______________ motor?

Hint
70). Which one of the following windings used for AC machines?

Hint
71). What are the reasons of a shaft related mechanical failure?

Hint
72). Which one of the following windings is also known as half coil winding?

Hint
73). Which class squirrel cage induction motor used for fan, pump load, etc where torque is low at start?

Hint
74). Which one of the following motors can be run under a wide range of of both leading and lagging?

Hint
75). Which one of the following windings is also known as bifurcated winding?

Hint

For More MCQs

  • Capacitor Start Capacitor Run Motor Question & Answers
  • Induction Motor Question & Answers
  • Reluctance Motor Question & Answers
  • Switched Reluctance Motor Question & Answers
  • DC Motor Question & Answers
  • Synchronous Motor Question & Answers
  • Single Phase Induction Motor Question & Answers
  • Poly Phase Induction Motor Question & Answers
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