DGVCL EXAM PAPER (11-12-2011) QUIZ

Hysteresis in an instrument means

The repeatability of the instrument

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

The inaccuracy due to change in temperature

The reliability of the instrument

TRUE ANSWER : ?
YOUR ANSWER : ?

Ybus used in power flow studies and Zbus used in short circuit studies

Are the same

Have no inter relation

Are inverse of each other

Are transpose of each other

TRUE ANSWER : ?
YOUR ANSWER : ?

The transient stability of a power system can be improved by

Single pole switching of circuit breakers

Increasing the turbine valve opening

Phase shifting transformer

Excitation control

TRUE ANSWER : ?
YOUR ANSWER : ?

A Mho relay is a

Voltage controlled over current relay

Directional restrained over current relay

Directional restrained over voltage relay

Voltage restrained directional relay

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YOUR ANSWER : ?

First zone distance relay protects the transmission line section upto

25 % of its full length

50 % of its full length

80 % of its full length

Its full length

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YOUR ANSWER : ?

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

Negative cycle of sine wave

Positive cycle of sine wave

DC

TRUE ANSWER : ?
YOUR ANSWER : ?

Permittivity is expressed in terms of

farad/sq. m.

Farad/m

N/m

Weber /m

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Algorithm

Logic

Software

Hardware

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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

TRUE ANSWER : ?
YOUR ANSWER : ?

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

60 MVA

10 MVA

50 MVA

20 MVA

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YOUR ANSWER : ?

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