Electrical Machines MCQ Multiple Choice Questions Answers for Practice
1. The power factor of the induction motor will be __________ if the magnetizing current is __________
Correct Answer is: Low ....... high
2. The magnetizing current of an induction motor will be __________ for __________ air gap
Correct Answer is: Smaller....... larger
3. In induction motors, small air gap __________ power factor and __________ noise level
Correct Answer is: Increases..........also increases
4. In induction motors, the difference between the number of stator and rotor slots should not be
Correct Answer is: Any of the above
5. Induction motor which of the following depends on the leakage reactance?
Correct Answer is: All of the above
6. The use of double squirrel cage winding on the rotor provides
Correct Answer is: A large starting torque
7. In induction motor if the number of rotor slots is equal to the stator slots then
Correct Answer is: The noise level will be low
8. In squirrel cage motors, skin effect occurs in
Correct Answer is: Both (A) and (B) above
9. A synchronous machine having large length of the air gap will have
Correct Answer is: Smaller unbalanced magnetic pull
10. Damper windings are provided in synchronous machines to
Correct Answer is: All of the above
11. Which of the following motors has a high starting torque?
Correct Answer is: DC series motor
12. The starting winding of a single-phase motor is placed in
Correct Answer is: Stator
13. In a DC series motor increase in load current results in
Correct Answer is: Decrease in speed
14. Which DC motors has approximately constant speed?
Correct Answer is: Shunt motor
15. An electric machine will have high efficiency when
Correct Answer is: losses are low
16. Inter poles in DC machines are provided to reduce
Correct Answer is: Sparking
17. DC motor yoke is generally made of
Correct Answer is: Steel
18. The output of a rotating electrical machine is limited by
Correct Answer is: Temperature rise
19. The dimensions of a dc machine primarily depend on
Correct Answer is: Work done per revolution
20. Skewing of rotor slots helps in
Correct Answer is: Suppressing undesirable harmonics
21. The harmonics in rotating machines are generated due to
Correct Answer is: Both (A) and (B) above
22. The effect of harmonics in rotating machines can be minimized by
Correct Answer is: all of the above
23. In dc machines the number of poles is generally decided by
Correct Answer is: all of the above
24. In dc machines by increasing the number of poles, all of the following reduce except:
Correct Answer is: Frequency of flux reversals
Dive into the world of Electrical Machines with our comprehensive collection of multiple-choice questions and answers. Whether you're a student studying electrical engineering, an engineer designing power systems, or simply interested in the workings of motors and generators, our meticulously curated selection covers a wide range of topics. Explore fundamental concepts such as electromagnetic principles, motor operation, generator design, and practical applications in industries and utilities. With our user-friendly interface and detailed explanations, mastering the complexities of electrical machines has never been more engaging and accessible. Start your journey towards understanding the backbone of electrical power systems today!
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Electrical Machines Multiple Choice Questions and Answers
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