Test: Power Systems - 7


25 Questions MCQ Test Electrical Engineering SSC JE (Technical) | Test: Power Systems - 7


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QUESTION: 1

Match List-I with List-II and select the correct answer using the codes given below the lists:

Solution:
QUESTION: 2

Consider the following statement :
1. The insulation resistance of cable will increase if the length of the cable is increased
2. For the same overall diameter of cable, the grading of cable will increases the safe working voltage
3. The normal operating temperature of PVC cable is 70ºC
4. The thermal resistance of soil increase as the moisture content of soil increase
Of these statement

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QUESTION: 3

Consider the following for line conductors:
1. Hard drawn copper
2. Cadmium copper
3. Aluminum
4. Galvanized steel
The correct sequence of the descending order of their electrical conductivities is

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QUESTION: 4

Lighting arresters are used in power systems to protect electrical equipments against

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QUESTION: 5

The voltages across the various discs of a string of suspension insulators having identical discs is different due to

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QUESTION: 6

A Bucholz relay is used for

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QUESTION: 7

To prevent maloperation of differentially relay while energizing a transformer, the relay restraining coil is biased with

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QUESTION: 8

In a medium or high head hydroelectric power station, a surge tank is provided to

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QUESTION: 9

Transmission lines are transported to

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QUESTION: 10

The impedance value of generator is 0.2 pu on a base value of 11 kV, 50 MVA. The impedance value for a base value of 22 KV, 150 MVA is

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QUESTION: 11

A surge voltage of 1000 kV is applied to an overhead line with its receiving -end open. If the surge impedance of the line is 500W, then the total surge power in the line is

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QUESTION: 12

Impulse ratio of insulators and lightning arresters should be

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QUESTION: 13

Bundled conductors in EHV transmission system provide

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QUESTION: 14

The charging current in a transmission line increases due to corona effect because corona increases

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QUESTION: 15

If the fault current is 2 kA, the relay setting is 50% and the C.T. ratio is 400/5, then the plug setting multiplier of a relay will be

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QUESTION: 16

The load curve of system is shown in the figure.

The load factor of the system is

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QUESTION: 17

Control rods used in neuclear reactors are made of

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QUESTION: 18

In a 3-core extra-high voltage cable, a metallic screen around each core-insulation is provided to

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QUESTION: 19

Galloping in transmission line conductors arises generally due to

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QUESTION: 20

Hollow conductors are used in transmission line to

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QUESTION: 21

Zero sequence current can flow from a line into a transformer bank if the windings are in

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QUESTION: 22

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

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QUESTION: 23

"Expanded ACSR" are conductors composed of

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QUESTION: 24

The non-uniform distribution of voltage across the units in a string of suspension type insulators is due to

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QUESTION: 25

Whenever the conductors are dead-ended or there is a change in the direction of transmission line, the insulators used are of the

Solution:

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