71. The commutating flux produced by interpole must be proportional to
- armature current
- field current
- both armature and field current
- none of the above
72. The polarity of the interpole is the
- same as that of the main pole ahead in case of generator
- same as that of the main pole ahead in case of motor
- same as that of the main pole behind in case of motor
- same as that of the main pole behind in case of generator
- both (1) and (3)
73. The interpole air gap is _____ that under the field poles, in dc machines.
- smaller than
- larger than
- equal to
- none of these
74. A dc machine is provided with both interpole and compensating windings. These two windings with respect to armature circuit will be in
- series
- parallel
- former in series and the latter in parallel
- former in parallel and the latter in series
75. In a seperately excited dc generator, the field is connected
- in series with an armature
- across the armature
- to an external supply source
- none of the above
76. Series field winding of a dc machine consists of
- few turns of thick wire
- few turns of thin wire
- many turns of thick wire
- many turns of thin wire
77. When the shunt field of a dc compound generator is connected across the series field and armature. Such a connection is known as
- short shunt
- long shunt
- cummulative compounding
- differential compounding
78. The series field of a short shunt dc generator is excited by _______ current.
- armature
- shunt field
- load
- both field and load current
79. With the increases in field excitation of a dc generator, its generated emf
- increases
- decreases
- remains constant
- increases upto a limit and then remains almost constant
80. The slight curvature at the lower end of the OCC of a self excited dc generator is due to
- magnetic inertia
- residual flux
- high speed
- high field resistance
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