DGVCL EXAM PAPER (11-12-2011) QUIZ

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

Logic

Hardware

Software

Algorithm

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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 inaccuracy due to change in temperature

The repeatability of the instrument

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If the fault current is 2000 A, the relay plug setting is 50% and the CT ratio is 400/5, the plug setting multiple will be

10

25

15

50

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Transposition of transmission line is done to

Balance line voltage drop

Reduce line loss

Reduce corona

Reduce skin effect

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

Insert a fuse of higher current rating

Check the load

Insert a fuse of higher voltage rating

Reduce the load

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Reactance relay is used to protect against

Over voltage faults

Phase faults only

Both phase and earth faults

Earth faults only

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The main advantage of using fractional pitch winding is to refuce

Amount of copper in the winding

Cost of the machine

Size of the machine

Harmonics in the generated emf

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An AC series circuit has R = 6 Ω, XL = 20 Ω and Xc = 12 Ω. The ciruit power factor will be

0.5 leading

0.6 lagging

0.6 leading

0.8 lagging

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The main criterion for the design of a distributor is

Voltage drop

Corona loss

Radio interference

Temperature rise

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

It avoids core saturation and high voltage induction

It protects the primary ciruits

It is safe to human beings

It protects the secondary ciruits

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