DGVCL EXAM PAPER (11-12-2011) QUIZ

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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Distribution transformers have good all day efficiency due to

Low copper as well as iron loss

Low voltage

Low iron loss

Low copper loss

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The motor used in celling fans is

Split phase motor

Capacitor start capacitor run motor

Capacitor start motor

Universal motor

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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

50 MVA

60 MVA

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Which type of back up protection is widely used for the protection of transmission lines?

Remote backup

Relay backup

Breaker backup

Control backup

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DC series motors are best suited for traction work because

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

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

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If the dielectric strength of the medium between the contacts builds up more rapidly than the restriking voltage the arc will

Decrease in size

Restrike

Extinguish

Increase in size

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Which motor is used to start heavy loads?

Cumulatively compounded motor

Series motor

Differentially compounded motor

Shunt motor

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

It's power factor is higher

It is suitable for higher speeds

It can be started with the help of rotor resistances

It has a higher efficiency

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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 earthing switch - open ciruit- breaker-open islotor

Close circuit breaker-close isolator - open earthing switch

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