Hiried Electrical Machine Design Multiple choice Questions and Answers pdf

51.    The design of electromagnets is based upon which of the following fundamental equations ?
(a)     Force equation
(b)     Magnetic circuit equation
(c)    Heating equation
(d)    Voltage equation
(e)    All of the above
Ans: e

52.    When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of
(a)     short pitch
(b)     full pitch
(c)    either of the above
(d)    none of the above
Ans: b

53    are always double layer type.
(a)    Closed windings
(b)    Open windings
(c)    Either of the above
(d)    None of the above
Ans: a

54.   The distance between the starts of two consecutive coils measured in terms of coil sides is called
(a)     front pitch
(b)     winding pitch
(c)    commutator pitch
(d)    back pitch
 Ans: b

55.    The winding where dummy coils are used is sometimes called
(a)    duplex winding
(b)    triplex winding
(c)    forced winding
(d)    none of the above
Ans: c

56.    Dummy coil should not be used in
(a)     small machines
(b)     large machines
(c)    either (a) or (b)
(d)    none of the above
Ans: b

57.    Power transformers have rating
(a)     equal to 50 kVA
(6)     equal to 100 kVA
(c)    above 200 kVA
(d)    none of the above
Ans: c

58.    Power transformers should be designed to have maximum efficiency
(a)    at one-fourth load
(b)    at one-half load
(c)    at or near full load
(d)     any of the above
Ans: c

59.    In transformers using hot rolled steel, the cross-section of the yoke is made about _____ greater than that of the core
(a)     5 percent
(b)     10 percent
(c)     15 percent
(d)     30 percent
(e)     none of the above
Ans: c

60.    Yokes with rectangular cross-section are used for
(a)    small capacity transformers
(b)    medium capacity transformers
(c)    large capacity transformers
(d)     any of the above
Ans: a

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