POWER SYSTEMS QUIZ

The ratio of reset to pick up current for an induction cup relay is approximately

1.0.

1.35.

0.75.

0.99.

TRUE ANSWER : ?
YOUR ANSWER : ?

The economics of power plant is greatly influenced by

diversity factor

nether 1 nor 2

both 1 and 2

load factor

TRUE ANSWER : ?
YOUR ANSWER : ?

The voltage and current instantaneous values are given as 5 sin (ωt + 30°) pu and 2 sin (ωt - 15°) pu respectively. Find the per unit active power?

5 pu

7 pu

5.353 pu

3.535 pu

TRUE ANSWER : ?
YOUR ANSWER : ?

The arc voltage produced in an AC circuit breaker is always

in phase with the arc current.

lagging the arc current by 90°.

leading the arc current by 90°.

in phase opposition with the arc current.

TRUE ANSWER : ?
YOUR ANSWER : ?

Advantage/s of per unit system as compare to absolute system?

only one equation is required

memory required is less

All of these

calculation time is less

TRUE ANSWER : ?
YOUR ANSWER : ?

A power station supplies the peak load of 50 MW, 40 MW and 70 MW to three localities. The annual load factor is 0.50 p.u. and the diversity factor of the load at the station is 1.55 the maximum demand on the station and average load respectively will be

53 MW.

52 MW.

51.61 MW.

57.5 MW.

TRUE ANSWER : ?
YOUR ANSWER : ?

The insulation of modern EHV is designed based on

lightning voltage.

switching voltage.

corona.

RI.

TRUE ANSWER : ?
YOUR ANSWER : ?

At slack bus, which one of the following combinations of variables is not specified?

Q and V

P and V

P and Q

V and δ

TRUE ANSWER : ?
YOUR ANSWER : ?

Earthing switch is used for

All of these

protection of equipment from ground faults

measuring of safety voltage

discharging residual energies

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following contributes to the Rankine cycle efficiency improvement in a thermal power plant

Reheat of steam an intermediate stages.

All of these

Use of steam for heating of boiler feed water.

Use of high pressure.

TRUE ANSWER : ?
YOUR ANSWER : ?

↑