DGVCL EXAM PAPER (11-12-2011) QUIZ

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

It protects the primary ciruits

It avoids core saturation and high voltage induction

It is safe to human beings

It protects the secondary ciruits

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YOUR ANSWER : ?

If a relay fails to operate inspite of a fault in its own zone of protection, it is said to

Under reach

Reach

Pick up

Over reach

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The bus bar zone faults are generally

Phase to phase faults

Three phase short ciruits

Single line to ground faults

Double line to ground faults

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All the peripheral devices connected to a computer require power to work. Which of the following voltages is required for the motherboard to work?

Positive cycle of sine wave

Negative cycle of sine wave

AC

DC

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Hysteresis in an instrument means

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

The reliability of the instrument

The inaccuracy due to change in temperature

The repeatability of the instrument

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A fixed step by step procedure for finding the solution of a problem on computer is called

Software

Algorithm

Hardware

Logic

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If the percentage reactance of the system upto the point of fault is 20% and the base kVA is 10,000 the short ciruit kVA is

10 MVA

20 MVA

50 MVA

60 MVA

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Due to skin effect

Uniform current flows through the conductor

Portion of the conductor near the surface carries less current and the core of the conductor carries more current

Portion of the conductor near the surface carries more current and the core of the conductor carries less current

Current flows through the half cross section of the conductor

TRUE ANSWER : ?
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A 3 phase, 6 pole induction motor operates on 440 V, 50 Hz, supply. If the actual speed of the motor is 960 rpm the slip will be

4 %

0.4 %

6 %

5 %

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Which lightning stroke is most dangerous?

Indirect stroke on conductor

Direct stoke on tower top

Direct stroke on line conductor

Direct stroke on ground wire

TRUE ANSWER : ?
YOUR ANSWER : ?