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Electrical Engineering - Electrical Machine Design MCQs
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Electrical Engineering - Electrical Machine Design MCQs
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25 Questions

1. In a D.C. machine, the value of peripheral speed should not, normally, exceed
2. Tractive magnets are operated from
3. Multi-layer helical windings are commonly used in the transformers as high voltage windings
4. Dummy coil should not be used in
5. The slot leakage can be calculated by making which of the following assumptions ?
6. In D.C. machines, the ____ in field mmf results in increase in size and cost of machines.
7. In ______ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft.
8. Machines cooled by direct cooling method may be called
9. The voltage control in electric supply networks in required on account of which of the following reasons ?
10. Tractive magnets are operated from
11. The change in flux linkages can be caused in which of the following ways ?
12. In D.C. machines the width of the duct is usually
13. In self cooled motors the cooling time constant is about ______ than the heating time constant because cooling conditions are worse at standstill.
14. Helical windings are used in
15. The cold rolled grain oriented steel has ______ permeability in the direction of the grain orientation.
16. are used for construction of core of electromagnets.
17. cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall
18. The high voltage winding is usually which of the following type ?
19. In a D.C. machine the current per brush arm should not be more than
20. Direct water cooling of rotor winding presents
21. The laminations of the armature of a D.C. machine are usually _____ thick.
22. ______is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ?
23. Direct water cooling of rotor winding presents
24. The insulation between windings and grounded core and the insulation between the windings of the same phase is called
25. is universally used for windings of electrical machines because it is easily workable without any possibility of fracture.

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