ONLINE Multiple Choice Questions EE- Synchronous Generator PAR 6



76. In
synchronous alternator, which of the following coils will have emf closer to
sine waveform ?
(A) concentrated winding in full pitch coils
(B) concentrated winding in short pitch coils
(C)
distributed
winding in full pitch coils
(D) distributed winding in short pitch coils.

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77. An
alternator has rated field current of 4 A. The alternator develops 180 V while
drawing a field current of 2 A at 750 rpm. If the field current is made 4 A at
750 rpm generated voltage could be
(A) 400 V
(B)
380 V
(C) 60V
(D)
330 V.

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78. The
armature reaction of an alternator will be completely magnetizing in case the
load power factor is
(A) unity
(B)
0.707
(C) zero lagging
(D) zero leading.

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79. Which
of the following is not an integral part of synchronous generator system ?
(A) prime mover
(B) distribution transformer
(C) excitation system
(D) protection system.

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80. For
turbo generators the range of excitation voltage is
(A) 10 to 20 V
(B) 30 to 100 V
(C) 100 to 800 V
(D) 1000 to 1800 V.

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81. In
case of low speed hydrogenerators, the short circuit ratio is usually
(A) 0.1 to 0.5
(B) 0.5 to 0.6
(C) 0.6 to 1.0
(D) 1.0 to 1.5.

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82. The
permissible duration for which a generator of rated frequency 50 Hz can run at
46 Hz is
(A) zero
(B)
one cycle
(C)
one second
(D) one minute.

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83. The
permissible duration in supply . frequency is
(A) ± 2 %
(B)
± 5 %
(C) ± 10 %
(D)
± 25 %.

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84. The
regulation of an alternator is likely to be negative in case of
(A) high speed alternators
(B) slow speed alternators
(C) lagging power factor of the load
(D) leading power factor of the load.

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Questions 85 to 88 refer to the data given below:

A phase, 50 Hz, 6600 V,
alternator is rated at 6600 kW at 0.8 power factor and a full load efficiency
of 90%.

85. kVA is rating of the alternator is
(A) 750 kVA
(B) 7500 kVA
(C) 75000 kVA
(D) 750000 kVA.

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86. The
current rating of the alternator is
(A) 65.63 A
(B)
656.3 A
(C) 6563 A
(D) 65630 A.

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87.
The
input to the alternator is
(A) 666.6 kW
(B)
6666 kW
(C)
66660 kW
(D) 666,600
kW.

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88. If the input. to an alternator remains
unaltered, but excitation is changed then which of the following will not
change ?
(A) kVA output
(B) kW output
(C)
power factor
(D) all of the above.

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89. Which
of the following method is likely to give the voltage regulation more than the
actual value ?
(A) Synchronous reactance method
(B) MMF method
(C) Zero power factor method
(D) None of the above.

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90. The
effect of cross magnetization in an alternator field is to make the output
(A) true sinusoidal
(B)
non-sinusoidal
(C) harmonic free
(D) none of the above.

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ONLINE Multiple Choice Questions EE- Synchronous Generator PAR 7
ONLINE MCQ-GENERAL HINDI(सामान्य हिन्दी) PART 5

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