Most recently Electrical Machine Design Multiple choice Questions and Answers pdf

41.    By which of the following methods motor rating for variable load drives can be determined ?
(a)     Method of average losses
(b)     Equivalent current method
(c)    Equivalent torque method
(d)    Equivalent power method
(e)    All of the above.
Ans: e

42.    Which of the following methods does not take into account the maximum temperature rise under variable load conditions ?
(a)     Equivalent power method
(b)     Equivalent current method
(c)    Method of average losses
(d)    Equivalent torque method
Ans: c

43.    Which of the following methods is most accurate ?
(a)     Equivalent current method
(b)     Equivalent power method
(c)    Equivalent torque method
(d)    Method of average losses
Ans: a

44.    By which of the following methods the temperature rise of windings and other parts may be determined ?
(a)     Thermometer method
(6)     Resistance method
(c)     Embedded temperature detector method
(d)     Any of the above
Ans: d

45.    The slot leakage can be calculated by making which of the following assumptions ?
(a)     The current in the slot conductors is uniformly distributed over their cross-section
(b)     The leakage path is straight across the slot and around the iron at the bottom
(c)     The permanence of air paths is only considered. The reluctance of iron paths is assumed as zero
(d)     All of the above
Ans: d

46.    The value of exciting or magnetizing current depends upon which of the following factors ?
(a)     Total m.m.f. required
(b)     The number of turns in the exciting winding
(c)    The way in which the winding is distributed
(d)    All of the above
Ans: d

47.   Tractive magnets are operated from
(a)     a.c. supply
(b)     d.c. supply
(c)    either a.c. or d.c. supply
(d)    none of the above
Ans: c

48    electromagnets generally function as holding magnets.
(a)     Tractive
(b)     Portative
(c)    Either of the above
(d)    None of the above
Ans: b

49.   Which of the following is the commonly used type of electromagnets ?
(a)     Flat-faced armature type
(b)     Horse shoe type
(c)    Flat-faced plunger type
(d)    All of the above
Ans: d

50    are used for construction of core of electromagnets.
(a)    Soft magnetic materials
(b)    Hard magnetic materials
(c)    Either (a) or (b)
(d)    None of the above
Ans: a

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