DGVCL EXAM PAPER (11-12-2011) QUIZ

Induction generator

Induction motor

Synchronous generator

Synchronous motor

Modem

Telephone line

Interface card

Special wires

Three phase short ciruits

Double line to ground faults

Single line to ground faults

Phase to phase faults

0.6 lagging

0.6 leading

0.8 lagging

0.5 leading

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

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

Its torque is proportional to the square of the armature current and speed is directional proporational to torque

Close circuit breaker-close isolator - open earthing switch

Close earthing switch - open ciruit- breaker-open islotor

Open circuit breaker-open isolator-close earthing switch

Open isolator close circuit breaker-open earthing switch

More than 90%

90 %

Less than 90%

80 %

There is a repelling force between the conductors

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

50

10

25

15

It is safe to human beings

It protects the secondary ciruits

It avoids core saturation and high voltage induction

It protects the primary ciruits