Test: Power Systems - 4


25 Questions MCQ Test Electrical Engineering SSC JE (Technical) | Test: Power Systems - 4


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QUESTION: 1

A distribution transformer is normally a transformer with primary and secondary winding sconnected in

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QUESTION: 2

High tension cables can be used for transmission of voltage upto

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QUESTION: 3

With the increase in transmission voltage, the volume of the conductor will

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QUESTION: 4

Alternator are rated in

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QUESTION: 5

A thermal plant has an efficiency of about

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QUESTION: 6

High voltage transmission is recommended because it

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QUESTION: 7

To detect inter-phase fault of three phase line, the number of relays needed will be

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QUESTION: 8

The sag in a transmission line conductors depends upon
 

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QUESTION: 9

Surge impedance of a transmission line is given by

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QUESTION: 10

The purpose of a circuit breaker is to

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QUESTION: 11

The permissible variation in supply frequency is

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According to
CENTRAL ELECTRICITY REGULATORY COMMISSION OF INDIA

Ideal Range of frequency variation

f = 50 ± 1%

49.5 to 50.5 Hz

Practical permissible Range of frequency variation

f = 50 ± 3%

48.5 to 51.5 Hz

The grid frequency should be maintained at 48.6 Hz. and above at all times.

QUESTION: 12

Series reactors are used to :

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QUESTION: 13

When a line-to-ground fault occurs, the current in the faulted phase is 100 A. The zero-sequence current in this case will be :

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QUESTION: 14

The zero-sequence current of a generator for line-to ground fault is j2.4 pu. Then the current through the neutral during the fault is

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QUESTION: 15

SF6 gas is transported in

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QUESTION: 16

The minimum oil circuit breaker has less volume of oil because

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QUESTION: 17

For rural electrification in a country like India with complex network, the circuit breaker preferred is ....... one.

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QUESTION: 18

In a 220 kV system, the inductance and capacitance up the circuit breaker location are 25 mH and 0.025mF respectively. The value of resistor required to be connected across the  breaker contacts which will give no transient oscillations, is

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The value of resistor required to be connected across the breaker contacts which will give no transient oscillations R is
R = 0.5* √(L/C)
R = 0.5 * √(25*10-3/(0.025*10-6))
R = 500 Ω

QUESTION: 19

Routine tests are conducted on

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QUESTION: 20

Current rating is not necessary in case of

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QUESTION: 21

Which of the following sequence of operation is correct for operation of circuit breaker, isolator and earthing switch while opening a circuit ?

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QUESTION: 22

Plug setting of an electromagnetic relay can be altered by varying

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QUESTION: 23

The most efficient torque– producing actuating structure for induction-type relays is

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QUESTION: 24

Buchholz relay to

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QUESTION: 25

The Buchholz protects a transformer from

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