DGVCL EXAM PAPER (11-12-2011) QUIZ

The purpose of skewing of rotor slots in an induction motor is

To reduce the locking tendency of the rotor

To reduce the magnetic hum of the motor

To increase the distributuion factor

To increase the breadth factor

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Pick up

Reach

Over reach

Under reach

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

It protects the primary ciruits

It is safe to human beings

It protects the secondary ciruits

It avoids core saturation and high voltage induction

TRUE ANSWER : ?
YOUR ANSWER : ?

Reactance relay is used to protect against

Over voltage faults

Earth faults only

Phase faults only

Both phase and earth faults

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If the voltage at the two ends of a line are 132 kV, and its reactance is 40 Ω, the stability limit of the line is

435.6 MW

217.8 MW

500 MW

251.5 MW

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If the excitation of a synchronous generator fails, it acts as a

Synchronous motor

Synchronous generator

Induction generator

Induction motor

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It is difficult interrupt a capacitive current because

Current magnitude is very small

It has a leading power factor

The restriking voltage can be high

Stored energy in the capacitor is very high

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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?

AC

Positive cycle of sine wave

DC

Negative cycle of sine wave

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The main criterion for the design of a distributor is

Temperature rise

Corona loss

Radio interference

Voltage drop

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Hysteresis in an instrument means

The reliability of the instrument

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

The repeatability of the instrument

The inaccuracy due to change in temperature

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YOUR ANSWER : ?

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