POWER SYSTEMS QUIZ

The specific speed ( NS ) of turbine is given by

none of these.

P√( N ) / H3/2.

N√( P ) / H2/3.

N√( P ) / H1.25.

TRUE ANSWER : ?
YOUR ANSWER : ?

In nuclear power plants which material is/are used as coolant?

graphite

All of these

liquid sodium

beryllium

TRUE ANSWER : ?
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Counter poise is used for

more surge impedance

reduce losses

proper discharging of lighting surges

less surge impedance

TRUE ANSWER : ?
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What is the function of economiser in steam boilers

improving thermal efficiency

cooling

collect ash particals

All of these

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The most commonly used material for insulators of overhead lines is

mica

PVC

glass

porcelain

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following represents the sag(S) of a transmission line?

S = wl²/2T

S = wl²/16T

S = wl²/8T

S = wl²/4T

TRUE ANSWER : ?
YOUR ANSWER : ?

A transmission line has impedance of (0.005 + j0.05) pu. Find the line at which maximum value of negative DC off set current is produced, if it is applied with Vm cosωt?

4.68 msec

1.47 msec

2.63 msec

9.68

TRUE ANSWER : ?
YOUR ANSWER : ?

Condition for maximum voltage regulation

tanφ = X/R

cosφ = R/X

tanφ = R/X

cosφ = X/R

TRUE ANSWER : ?
YOUR ANSWER : ?

Find the number of insulator discs required in string insulator, if operating voltage is 220 kV and maximum voltage of each disc is 11 kV?

13

10

21

20

TRUE ANSWER : ?
YOUR ANSWER : ?

The angular moment of 10 MVA generator is 0.2. Find the new value of angular moment for 20 MVA base?

0.4 pu

0.25 pu

0.2 pu

0.1 pu

TRUE ANSWER : ?
YOUR ANSWER : ?

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