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Electrical Machine Design MCQs
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Electrical Machine Design MCQs
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25 Questions

1. The efficiency of a machine should be as _________ as possible to reduce the operating cost.
2. The surge phenomenon is particularly important in case of
3. A current density of _______ is used for large power transformers with forced circulation of oil or with water cooling coils
4. The heat dissipating capability of transformers of rating higher than 30 kVA in increased by providing which of the following ?
5. If an insulating material is operated beyond the maximum allowable temperature, its life is
6. The noise produced by a _________ cooled machine is less as the rotor moves in a medium of smaller density.
7. In a D.C. machine, the value of peripheral speed should not, normally, exceed
8. In D.C. machines, the ________ infield mmf results in increase in size and cost of machines.
9. The time taken by the machine to attain 0.632 of its final steady temperature rise is called
10. Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits?
11. The winding where dummy coils are used is sometimes called
12. When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of
13. The cylindrical windings using circular conductors are used for current rating of
14. D.C. windings are
15. A practical formula for determining the thickness of insulation between low voltage and high voltage winding is
16. In a D.C. machine the number of brush arms is _____ the number of poles.
17. _________is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties?
18. Hydrogen has a heat transfer coefficient _________ times that of air
19. Which of the following is the basic consideration in the design of insulation?
20. Which of the following in an application of D.C. motors?
21. In D.C. machines the usual limit of slot pitch is
22. The thermal conductivity of hydrogen is ______ times that of air
23. The density of hydrogen is _________ times the density of air.
24. Machines cooled by direct cooling method may be called
25. Materials exhibiting zero value of resistivity are known as ________.

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