91. In any rotating machine that part which houses the
conductors and in which e.m.f. induced is to be utilised is called
(A) rotor
(B) stator
(C) field
(D) armature
Ans: d
92. In a D.C. machine stray loss is the sum of
(A) total copper loss and mechanical loss
(B) armature copper loss and iron loss
(C) shunt field copper loss and
mechanical loss
(D) iron loss and mechanical loss
Ans: D
93. Lap winding is composed of
(A) any even number of conductors
(B) any odd number of conductors
(C) that even number which is exact
multiple of poles + 2
(D) that even number which is exact
multiple of poles
Ans: A
94. In a D.C. generator in case the resistance of the field
winding is increased, then output voltage will
(A) increase
(B) decrease
(C) remain unaffected
(D) fluctuate heavily
Ans: B
95. An exciter for a turbo generator is a
(A) separately excited generator
(B) shunt generator
(C) series generator
(D) compound generator
Ans: B
96. In case of a flat compounded generator
(A) voltage generated is less than the
rated voltage
(B) generated voltage is proportional to
the load on the generator
(C) voltage remains constant
irrespec¬tive of the load
(D) speed varies in proportion to the
load on the generator
Ans: C
97. Which of the following generator will have negligible
terminal voltage while running on no load ?
(A) Series generator
(B) Shunt generator
(C) Compound generator
(D) Separately excited generator
Ans: A
98. Which of the following D.C. generators will be in a
position to build up without any residual magnetism in the poles ?
(A) Series generator
(B) Shunt generator
(C) Compound generator
(D) None of the above
Ans: D
99. In over compounded generator, full load terminal voltage
is
(A) almost zero
(B) less than noload terminal voltage
(C) more than noload terminal voltage
(D) equal to no-load terminal voltage
Ans: C
100. In a level compounded D.C. generator, full load terminal
voltage is
(A) negligibly low
(B) equal to no-load terminal voltage
(C) more than no-load terminal voltage
(D) less than no-load terminal voltage
Ans: B
101. The terminal voltage of a D.C. shunt
generator drops on load because of all of the following reasons except
(A) armature reaction
(B) armature resistance drop
(C) field weakening due to armature
reaction and armature
(D) commutation
Ans: D
102. In a D.C. generator
(A) external resistance = internal
char-acteristic - armature reaction
(B) internal characteristic =
magnetisation characteristic - ohmic drop
(C) external characteristic =
magnetisation characteristic - ohmic drop - armature reaction
(D) magnetisation characteristic =
external characteristic
Ans: C
103. A sinusoidal voltage of 5 Hz is applied to the field of
a shunt generator. The armature voltage wave
(A) will be zero
(B) will be of 5 Hz
(C) willbeof5xiVHz
(D) will be of v Hz 5
Ans: B
104. A 220 V D.C. generator is run at full speed without any
excitation. The open circuit voltage will be
(A) zero
(B) about 2 V
(C) about 50 V
(D) 220 V
Ans: B
105. In a separately excited generator supplying rated load
the armature reaction ,
(A) is always present
(B) is always absent
(C) may be sometimes present
(D) none of the above
