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GETCO Exam Paper (22-07-2015)

GETCO Exam Paper (22-07-2015)
The power factor of the arc in circuit breaker is

always lagging
always unity
always zero
always leading

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GETCO Exam Paper (22-07-2015)
Two heaters rated at 500 W, 250 V each are conneted in series across a 250 V, 50 Hz mains. The total power drawn from the supply would be _____ watt.

500
1000
250
125

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GETCO Exam Paper (22-07-2015)
For eliminating 7th harmonics from generated EMF in alternator the fractional pitch must be

2\3
6\7
5\6
7\8

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

fractional pitch = Cos( α/2)
α is obtain from: (nα/2)=90˚ where n is harmonic
α=25.7143˚
fractional pitch=6/7

GETCO Exam Paper (22-07-2015)
The magnitude of sum of two sinusoidal AC voltages is equal to the magnitude of each individual voltage, What must be the phase difference between voltages?

120
90
60
180

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GETCO Exam Paper (22-07-2015)
In synchronous motor, V-curve is a graph of

Armature current Vs power factor
Armature current Vs reactive power
Armature current Vs Field current
Armature current Vs active power

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

v curve: armature current → field current
Inverted V curve: power factor → field current

GETCO Exam Paper (22-07-2015)
The area under the load duration curve represents

Maximum demand of the power station
energy generated in the period considered
average load of the system
base load of the system

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MORE MCQ ON GETCO Exam Paper (22-07-2015)

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