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Induction Motor Question & Answers

February 1, 2023 By Wat Electrical

This article lists 100 Induction Motor MCQs for engineering students. All the Induction Motor Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Induction Motors.

In the present era, electrical equipment and electricity play a significant role. Imagine life without them is practically hard. One of those electrical devices is the motor. Motors can be AC and DC. Compared to Dc the usage of Ac motors is more frequent and prevalent. For everyday applications various motors of Ac are available.

Based on the specifications AC motors are categorized. Considering the operating principle of AC motors. These are classified as Synchronous, Asynchronous, and commutator motors. If the rotation speed of stators is equivalent to its rotor's speed, then this motor is called Synchronous.

In Asynchronous motors, the rotor is passive i.e., permanently short-circuited or temporary. Several megawatts are produced by these motors. It can be used frequently as a three-phase motor in Industrial areas. Induction motors belong to the category of Asynchronous motors.

The electric current in rotors produces a torque that is due to the electromagnetic induction from the magnetic field of stator windings in an Induction motor. These motors are also manufactured without having any electrical connection to the rotor. These motors are either squirrel-cage or wound types.

1). Which motors can be powered by stators?

Hint
2). Induction Motor is a ________________?

Hint
3). The actual speed is not equivalent to the motor's synchronous speed in ______?

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4). Synchronous speed is _____________ than the original speed of induction motors?

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5). Which motor has the conductors of the rotor short-circuited at the ring's end?

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Read More about Induction Motor

6). What is the principle involved in induction motors?


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7). The rotation speed of the magnetic field in the rotary machines is ____________?

Hint
8). How many supplies are given to operate Induction motors?

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9). Which winding in the induction motor is powered with supply?

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10). Which winding in the induction motor magnetic field is produced?

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11). How many fluxes are generated in induction motors?

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12). Which flux will lag in Induction motors?

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13). The motor begins to function without any force application is ________?

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14). What are the types of Induction motors?

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15). Which motor does not have any electrical connection to the rotor?

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16). What are the types of Induction motors based on rotors type?

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17). The stator with thin steel lamination is present in __________?

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18). How many power phases are required by induction motors of single-phase to operate?

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19). Which part is rotating in induction motors?

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20). Induction motors are regarded as ___________?

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21). What happens if induction motors run at a synchronized speed?

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22). Which motors cannot operate on lags and leads of power factors?

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23). What carries winding i.e., short-circuited in induction motors?

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24). Which windings produce magnetic-field in induction motors?

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25). Which conductors are fixed or stationary in induction motors?

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Induction Motor MCQs for Students

26). Where is the torque developed in induction motors?

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27). The rotor and the magnetic field are rotated in __________ direction?

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28). What happens to induction motors' speed as the load is increased?

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29). Self-starting torques are present in _________?

Hint
30). The relative motion among rotor and stator RMFs is required in ____________?

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31). Less starting torque is required in _________?

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32). What are the major components of Induction motors?

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33). What is the input to induction motors?

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34). The magnetic field generated in induction motors is __________?

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35). The Power factor is predetermined in _________?

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36). What is the power rating of induction motors?

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37). Which induction motor has low torque of starting?

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38). Which induction motors are less efficient?

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39). Which type of induction motor has a higher Power factor?

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40). What is the basic difference between a three-phase and single-phase induction motor?

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41). Which induction motor is expensive?

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42). Capacitor start and run induction motor belong to ________?

Hint
43). Which motors are rotated using auxiliaries?

Hint
44). What is Resistance Start Motor?

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45). Which induction motor is used for higher loads of inertia?

Hint
46). Which motors have higher torque at starting?

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47). Which is a self-starting 'single-phase induction motor'?

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48). Power loss is high in __________?

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49). Why do Shaded-pole type induction motors have poor efficiency?

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50). Power factor will be less in ______?

Hint

Induction Motor MCQs for Exams

51). Load requires speed controlling use ___________?

Hint
52). The copper losses are higher in __________?

Hint
53). The windings of the rotor are 'STAR' connected in __________?

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54). Which are the widely utilized induction motors of three-phase?

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55). What requires resistors externally?

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56). Hair dryers have ____________?

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57). Which motors are utilized in Bridge cranes?

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58). VFD added to _____________for altering motor’s speed?

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59). Borewells have _________?

Hint
60). In how many classes the Squirrel-cage induction motors is divided?

Hint
61). Class A motor of induction motors have _________?

Hint
62). What does a class B of induction motor contain?

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63). Which class of induction motors has constant load speed?

Hint
64). Which motor is present in the crusher & compressor?

Hint
65). The conveyors have ____________ type induction motors?

Hint
66). Which class has the highest torques at starting?

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67). The rotor conductors will be short-circuited with heavy rings at the end in _________?

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68). What are the advantages of a Squirrel cage rotor?

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69). Which class of motors has higher operating slips?

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70). Which class of motors is utilized in Bulldozers?

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71). Which type of induction motors are utilized in elevators?

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72). Speed control is difficult in __________?

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73). Why do slip-ring induction motors have better-starting torques?

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74). Rush currents are high in ________?

Hint
75). Which motors are operated in polluted environments?

Hint

Induction Motor MCQs for Interviews

76). What happens if air gap gets increased in an induction motor?

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77). Increase in air-gap of induction motors increases _______?

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78). Which motors is works as a single-excited motor?

Hint
79). Which motors are maintenance-free?

Hint
80). Why the induction motor is less costly?

Hint
81). Lifts & cranes use _________?

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82). Low-power applications use ___________?

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83). Air gap is required in ________?

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84). Mechanical loads are driven by ___________?

Hint
85). Which motors are considered economical?

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86). Which motor can be constructed without any complexities?

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87). Which motors are operated only at lag power factors?

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88). Which motor is a Single-excited machine?

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89). Which induction motors are most frequently used?

Hint
90). High starting torques based loads use___________?

Hint
91). Pump uses ___________?

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92). Which motors suffer from a slip?

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93). Efficiency is less in _________?

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94). What is the most commonly used motor in water wells?

Hint
95). Which induction motors are utilized if loads are small?

Hint
96). Three-phase squirrel-cage Induction motors are ___________?

Hint
97). Household refrigerators have ____________?

Hint
98). The ceiling fans use ______________?

Hint
99). Which motors are utilized in water pumps?

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100). Which motor is referred to as Rotating Transformer?

Hint

For More MCQs

  • 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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