DGVCL EXAM PAPER (11-12-2011) QUIZ

A Mho relay is a

Directional restrained over current relay

Voltage controlled over current relay

Directional restrained over voltage relay

Voltage restrained directional relay

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Different computers are connected to a LAN by a cable and a

Telephone line

Modem

Interface card

Special wires

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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 is safe to human beings

It protects the primary ciruits

It protects the secondary ciruits

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The picture on the monitor of a computer is made up of tiny coloured dots called

Spots

Points

Pixels

Icons

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The purpose of providing a choke in a tube light is

To improve the power factor

To eliminate corona effect

To limit the current to an appropriate value

To avoid radio interference

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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

10 MVA

20 MVA

60 MVA

50 MVA

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Distribution transformers have good all day efficiency due to

Low voltage

Low iron loss

Low copper as well as iron loss

Low copper loss

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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

Insert a fuse of higher current rating

Check the load

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Which motor is used to start heavy loads?

Shunt motor

Differentially compounded motor

Cumulatively compounded motor

Series motor

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The mutual inductance between two unity coupled coils of 9 H and 4 H is

13 H

6 H

2.2 H

36 H

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