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Electrician Practice Test: Alternator
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Avg score: 72% • Most missed: “If the excitation of two alternators operating in parallel is changed, this resu…”
Electrician Practice Test: Alternator
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25 Questions

1. In an alternator, when the load increases due to armature reaction, the terminal voltage
2. For parallel operation of the two alternators, desirable feature is that both should have
3. An alternator is said to be over excited when it is operating at
4. What is the name of the equipment that provides DC to the rotor of alternator?
5. A three phase alternator has a phase sequence of RYB for its three output voltages. In case the field current is reversed, the phase sequence will become
6. The ratio of armature leakage reactance to synchronous reactance of large size modern alternator is about
7. After wiring up two 3-φ alternators, you checked their frequency and voltage and found them to be equal. Before connecting them in parallel, you would
8. If the excitation of two alternators operating in parallel is changed, this result change in
9. Alternator works on the principle of
10. A 10 pole AC generator rotates at 1200 rpm. The frequency of AC voltage in cycles per second will be
11. A 50-Hz alternator will run at the greatest possible speed if it is wound for ....... poles.
12. In synchronous machine, poles are made up of thick steel laminations. In salient pole type rotor
13. A lower voltage alternator, for the same power rating, will be
14. The slip rings employed in a 3-phase alternator in hydro station are insulated for
15. An alternator driven by a Francis hydraulic turbine is a ........alternator
16. The frequency of voltage generated in an alternator depends on
17. Which condition is to be satisfied before parallel operation of alternators?
18. Rotor winding of alternator is also known as:
19. An alternator is said to be over excited when it is operating at
20. Fleming's left hand rule may be applied to an electric generator to find out
21. The exciting field coil of an alternator is generally excited by
22. What is the use of synchro scope?
23. When the speed of an alternator increases
24. Two alternator operating in parallel must have same
25. In alternators fractional pitch coil are used to reduce the effect of

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