TOP Electrical Machine Design Multiple choice Questions and Answers pdf

11.    Commercial available medium size machines have a speed range of    ______ .
(a)     200 to 400 r.p.m.
(b)     600 to 1000 r.p.m.
(c)    1000 to 1500 r.p.m.
(d)    2000 to 2500 r.p.m.
Ans: d

12.    The action of electromagnetic machines can be related to which ofthe following basic principles ?
(a)     Induction
(b)     Interaction
(c)     Alignment
(d)     All of the above
Ans: d

13.    The change in flux linkages can be caused in which ofthe following ways ?
(a)    The flux is constant with respect to time and is stationary and the coil moves through it
(b)    The coil is stationary with respect to flux and the flux varies in magnitude with respect to time
(c)    Both the changes mentioned above occure together, i.e., the coil moves through a time varying field
(d)    All ofthe above
Ans: d

14    is universally used for windings of electrical machines because it is easily workable without any possibility of fracture.
(a) Silver
(b) Steel
(c) Aluminium    
(d) Copper
Ans: d

15. Aluminium when adopted as a conductor material in ______ transformers, decreases the overall cost of the transformer
(a)     small size
(b)     medium size
(c)    large size
(d)    any of the above size
Ans: a

16.    Which ofthe following materials is used in the manufacture of resistance grids to be used in the starters of large motors ?
(a)     Copper
(b)     Aluminium
(c)     Steel
(d)     Cast-iron
Ans: d

17.    Materials exhibiting zero value of resistivity are known as ______ . 
(a)     conductors
(b)     semiconductors
(c)     insulators
(d)     superconductors
Ans: d

18.  ________ has a lowrelative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable.
(a)     Cast steel
(b)     Aluminium
(c)     Soft steel
(d)     Cast iron
Ans: d

19    ______is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ?
(a)     Grey cast-iron
(b)     Cast steel
(c)    High carbon steel
(d)    Stainless steel
Ans: b

20.    Hot rolled sheets have ______ value of permeability
(a)     zero
(b)     low
(c)     high
(d)     none ofthe above
Ans: b

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