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Electronics Mechanic Practice Test: Electrical Control Circuits
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Electronics Mechanic Practice Test: Electrical Control Circuits
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25 Questions

1. What is the full load current of a 10 HP, three phase, 415 V squirrel-cage motor
2. Which force is used capacitor-start, induction-run motor to disconnect the starting winding?
3. Which induction motor is preferred for constant speed with high efficiency performance?
4. Which formula is used to find the fusing factor?
5. What is the cause of humming noise from the starter
6. What is the synchronous speed (Ns) of a 3phase induction motor with 8 poles working at 50Hz?
7. Which synchronous speed of the motor, the starting winding is opened by the centrifugal switch?
8. In mixer-grinder, a…. motor is used________
9. The ratio of R.M.S. value to average value of AC is called___________
10. The wave form of the output voltage generated by an alternator is ___________
11. Which starter is used for increasing the speed of a DC motor beyond its rated speed________
12. Why the main and starting windings of split-phase motor connected across the supply only at the time of starting?
13. The reason of laminating the armature core is _________
14. What is the factor for time taken a fuse to interrupt the circuit in the event of fault?
15. A motor is an electrical machine which converts_________
16. Why the AC relay connected to DC supply draw more current?
17. The principle of operation of a universal motor is identical to that of a ______
18. Which motors are used on loads having high inertia and long acceleration period?
19. If the speed of the conductor rotating in a magnetic field is increased, the magnitude of induced e.m.f.___________
20. What is the result on the split-phase motor by changing the main winding terminals?
21. Why squirrel cage induction motor is preferred for efficient performance?
22. In India, the generation and distribution of AC power is done in ___________
23. What is the purpose of capacitor used in the single phase motor
24. The standard frequency of AC supply in India is _________
25. Which motor is characterized by low rotor circuit resistance and reactance?

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