Power Systems Mcq

01. Length of the cable is doubled, its capacitance C will be

one-fourth.

one-half.

doubled.

unchanged.


02. Tarapur nuclear power plant has which type of reactor?

Pressurized water reactors.

Boiling water type.

CANDU type reactors.

None of these.


03. Which of the following rotor is used in thermal power plants?

cylindrical rotor

salient pole rotor

either of these

squirrel cage rotor


04. India’s largest thermal power station is located at

Kota.

Sarni.

Chandrapur.

Neyveli.


05. What should be the minimum depth (in metre)of cable trench to dug for laying of 1.1 kV?

0.75.

0.90.

1.05.

1.20.


06. NTPC (National Thermal Power Cooperation) has its only thermal power generating unit in West Bengal at

Durgapur.

Bakreshwar.

Farakka.

Katwa.


07. Galvanised steel is generally used as

stray wire.

earth wire.

structural components.

all of the above.


08. Plug setting of a relay can be altered by varying

air gap of magnetic path.

no. of ampere-turns.

adjustable back up stop.

none of these.


09. Objectives of power system is/are

Cost of electrical energy per KWh is to be minimum

Rated voltage and frequency has to be supplied to the consumers

both 1 and 2

nether 1 nor 2


10. Advantages of higher transmission voltage is/are

Power transfer capability of the transmission line is increased

Transmission line losses are reduced

Area of cross section and volume of the conductor is reduced

all of the above


11․ Which of the following statement is true

At higher voltage, cost of transmission is reduced

At higher voltage, cost of transmission is increased

efficiency decreased

all of the above


12. Maximum power transfer capability of transmission line can be increased by

Parallel transmission lines

Using series capacitance

Using bundled conductors

all of the above


13. For flat voltage profile system, voltage regulation is

0%

100%

50%

any of the above


14. Maximum power transfer in a transmission line can be obtained by

increasing voltage level

reducing reactance

either 1 or 2

none of the above


15. Ferranti effect will not occur in which of the following transmission lines

long transmission lines

short transmission lines

medium transmission lines

all of the above


16. Which of the following methods is/are used for reactive or voltage compensation

shunt capacitor

series capacitor

generation excitation control

all of the above


17. Ferranti effect can be compensated by which of the following

shunt capacitor

shunt reactor

series capacitor

both 1 and 2


18. Stability of a transmission line can be increased by

shunt capacitor

series capacitor

shunt reactor

both 1 and 2


19. Which of the following method is used for changing power factor from leading to lagging

shunt capacitor

series capacitor

shunt reactor

any of the above


20. Under over excitation synchronous phase modifier works as

shunt capacitor

series capacitor

shunt reactor

any of the above


21. Under excited Synchronous phase modifier works as

shunt capacitor

series capacitor

shunt reactor

any of the above


22. Specified quantities of load bus are

P and Q

V and δ

P and δ

Q and V


23. Specified quantities of slack bus are

P and Q

V and δ

P and δ

P and V


24. Telecommunication lines are transposed to reduce the

efficiency

radio interference in communication lines

voltage level

all of the above


25. Which of the following produces the radio interference in communication lines?

electro magnetic induction

electro static induction

both 1 and 2

none of the above


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