DGVCL EXAM PAPER (11-12-2011) QUIZ

The purpose of interpoles in DC machines is to nullify

The demagnetizing effect of armature mmf

Both the cross-magnetizing mmf and the reactance voltage

The reactance voltage

The cross-magnetizing effect of armature mmf

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

20 MVA

50 MVA

60 MVA

10 MVA

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YOUR ANSWER : ?

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

Icons

Pixels

Points

Spots

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Which of the following power distribution system gives better reliabity ?

DC 3 wire system

Ring main system

None of these

Radial system

TRUE ANSWER : ?
YOUR ANSWER : ?

The main criterion for the design of a distributor is

Corona loss

Radio interference

Temperature rise

Voltage drop

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What happens to the contents of RAM (Random Access Memory) when the power of the computer is turned off?

Content gets corrupted

Content is transferred to other memory

Content is lost

Content remains intact

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YOUR ANSWER : ?

The circuit breaker generally used in railway traction is

Vacuum CB

Minimum Oil CB

Bulk Oil CB

Air break CB

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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

25

10

50

15

TRUE ANSWER : ?
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Buchholz relay causes

Tripping for minor faults and alarm for major faults

Tripping for both major and minor faults

Tripping for major faults and alarm for minor faults

Alarm for both major and minor faults

TRUE ANSWER : ?
YOUR ANSWER : ?

The form factor in AC means the ration of

Peak value to average value

R.M.S. value to average value

Peak value to r.m.s value

R.M.S. value to peak value

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