DGVCL EXAM PAPER (11-12-2011) QUIZ

In which of the following motors, the stator and rotor magnetic fields rotate at the same speed?

Universal motor

Reluctance motor

Synchronous motor

Induction motor

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A Mho relay is a

Directional restrained over current relay

Voltage restrained directional relay

Directional restrained over voltage relay

Voltage controlled over current relay

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The advantage of slipring induction motor over the squirrel cage induction motor is

It is suitable for higher speeds

It has a higher efficiency

It can be started with the help of rotor resistances

It's power factor is higher

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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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Two parallel conductors are carrying the current in the same direction. Which of the following statements is correct?

The force increases when the distance between the conductors is increased

There is an attracting force between the conductors

The force increases when the distance between the conductors is decreased

There is a repelling force between the conductors

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Transposition of transmission line is done to

Reduce skin effect

Reduce corona

Reduce line loss

Balance line voltage drop

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The motor used in celling fans is

Capacitor start motor

Capacitor start capacitor run motor

Universal motor

Split phase motor

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Bulk power transmission over long HVDC lines are preferred on account of

Minimum line power losses

No harmonic problems

Low cost of HVDC terminals

Simple protection

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The main advantage of using fractional pitch winding is to refuce

Size of the machine

Harmonics in the generated emf

Cost of the machine

Amount of copper in the winding

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If a 5 A fuse is blown frequently in a house lighting circuit, it is required to

Reduce the load

Insert a fuse of higher voltage rating

Check the load

Insert a fuse of higher current rating

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