DGVCL EXAM PAPER (11-12-2011) QUIZ

In a power plant, a reserve generating capacity which is not in service but is in operation is known as

Cold reserve

Spinning reserve

Firm power

Hot reserve

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What type of insulator is used if the direction of the transmission line is to be changed?

Pin type

Suspebsion type

Strain type

Shakle type

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A fuse wire should have

High specific resistance and low melting point

Low specific resistance and low melting point

Low specific resistance and high melting point

High specific resistance and high melting point

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First zone distance relay protects the transmission line section upto

80 % of its full length

Its full length

25 % of its full length

50 % of its full length

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The bus bar zone faults are generally

Double line to ground faults

Phase to phase faults

Single line to ground faults

Three phase short ciruits

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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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Which of the following power distribution system gives better reliabity ?

DC 3 wire system

None of these

Ring main system

Radial system

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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

Open isolator close circuit breaker-open earthing switch

Close circuit breaker-close isolator - open earthing switch

Close earthing switch - open ciruit- breaker-open islotor

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DC series motors are best suited for traction work because

Its torque is proportional to the square of the armature current and speed is directional proporational to torque

Torque and speed are inversely proportional to the square of the armature current

Its torque is proportional to the square of the armature current and speed is inversely proportional to torque

Torque and speed are proportional to the square of the armature current

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The purpose of providing a choke in a tube light is

To avoid radio interference

To eliminate corona effect

To improve the power factor

To limit the current to an appropriate value

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