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GETCO Exam Paper (22-07-2015)

GETCO Exam Paper (22-07-2015)
The line current in a three phase unbalanced load are Ir= 4+j6, Ib= 2-j2 and Ic= -3+j2, then zero sequence component of current will be

3 + j6
3 - j6
1 + j2
9 + j10

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GETCO Exam Paper (22-07-2015)
The insulation strength of an EHV transmission line is mainly governed by

Harmonics
Load power factor
Switching over voltages
Corona

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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.

1000
250
500
125

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GETCO Exam Paper (22-07-2015)
In case of HVDC transmission there is _____

no charging current no skin effect
charging current but no skin effect
no charging current but skin effect
both charging effect and skin effect

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GETCO Exam Paper (22-07-2015)
In sub stations for making and breaking of load current

isolators are used
relays are used
load interrupter switches are used
circuit breakers are used

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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?

60
90
180
120

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