DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
The transient stability of a power system can be improved by

Single pole switching of circuit breakers

Increasing the turbine valve opening

Excitation control

Phase shifting transformer

Single pole switching of circuit breakers

Increasing the turbine valve opening

Excitation control

Phase shifting transformer

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DGVCL Exam Paper (11-12-2011)
The motor used in celling fans is

Split phase motor

Capacitor start capacitor run motor

Universal motor

Capacitor start motor

Split phase motor

Capacitor start capacitor run motor

Universal motor

Capacitor start motor

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DGVCL Exam Paper (11-12-2011)
A fuse wire should have

High specific resistance and high melting point

High specific resistance and low melting point

Low specific resistance and high melting point

Low specific resistance and low melting point

High specific resistance and high melting point

High specific resistance and low melting point

Low specific resistance and high melting point

Low specific resistance and low melting point

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DGVCL Exam Paper (11-12-2011)
The form factor in AC means the ration of

Peak value to r.m.s value

R.M.S. value to average value

Peak value to average value

R.M.S. value to peak value

Peak value to r.m.s value

R.M.S. value to average value

Peak value to average value

R.M.S. value to peak value

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DGVCL Exam Paper (11-12-2011)
Which lightning stroke is most dangerous?

Indirect stroke on conductor

Direct stroke on ground wire

Direct stroke on line conductor

Direct stoke on tower top

Indirect stroke on conductor

Direct stroke on ground wire

Direct stroke on line conductor

Direct stoke on tower top

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DGVCL Exam Paper (11-12-2011)
The purpose of providing a choke in a tube light is

To limit the current to an appropriate value

To improve the power factor

To avoid radio interference

To eliminate corona effect

To limit the current to an appropriate value

To improve the power factor

To avoid radio interference

To eliminate corona effect

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