DGVCL EXAM PAPER (11-12-2011) QUIZ

The purpose of interpoles in DC machines is to nullify

The cross-magnetizing effect of armature mmf

Both the cross-magnetizing mmf and the reactance voltage

The reactance voltage

The demagnetizing effect of armature mmf

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People can interact with each other through any part of the world through video conferencing using

Joystick

Speaker

Webcam

Scanner

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The motor used in celling fans is

Capacitor start capacitor run motor

Split phase motor

Universal motor

Capacitor start motor

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Which type of back up protection is widely used for the protection of transmission lines?

Remote backup

Control backup

Breaker backup

Relay backup

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The picture on the monitor of a computer is made up of tiny coloured dots called

Icons

Spots

Pixels

Points

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Under operating conditions, the secondary of a current transformer is always short ciruited because

It protects the secondary ciruits

It avoids core saturation and high voltage induction

It protects the primary ciruits

It is safe to human beings

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The main advantage of using fractional pitch winding is to refuce

Size of the machine

Amount of copper in the winding

Cost of the machine

Harmonics in the generated emf

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The mutual inductance between two unity coupled coils of 9 H and 4 H is

2.2 H

13 H

6 H

36 H

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Hysteresis in an instrument means

The inaccuracy due to change in temperature

The reliability of the instrument

The repeatability of the instrument

The change in the same reading when the input is first increased and then decreased

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Which of the following correctly represents the sequence of operations of isolator, circiut breaker and earthing switch while opening a circuit?

Open circuit breaker-open isolator-close earthing switch

Close earthing switch - open ciruit- breaker-open islotor

Close circuit breaker-close isolator - open earthing switch

Open isolator close circuit breaker-open earthing switch

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