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Power System Protection MCQ page-1

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1.Current copping tendency is minimized by using the SF6 gas at relatively

a) High pressure and low velocity.
b) High pressure and high velocity.
c) Low pressure and low velocity.
d) Low pressure and high velocity.

Ans: (c)

2. Order of the lightning discharge current is

a) 10,000 amp
b) 100 amp
c) 1 amp
d) 1 microampere

Ans: (a)

3. For the same rupturing capacity, the actual current to be interrupted by an HRC fuse is

a) Much less than any CB.
b) Mush more than any CB.
c) Equal to the CB.
d) None of the above is necessary.

Ans: (a)

4. Arcing on transmission lines is prevented by connecting a suitable

a) Circuit breaker.
b) Protective relay.
c) Inductor in the neutral.
d) Capacitor in the neutral.

Ans: (c)

5. For rural electrification in a country like India with complex network it is preferable to use

a) Air break C.B.
b) Oil C.B.
c) Vacuum C.B.
d) M.O. C.B.

Ans: (c)

6. Shape of the disc of an induction disc relay is

a) Circular
b) Spiral
c) Elliptic

Ans: (b)

7. A Mho relay is a

a) Voltage restrained directional relay.
b) Voltage controlled over current relay.
c) Directional restrained over current relay.
d) Directional restrained over voltage relay.

Ans: (a)

8. Number of pilot wires required for protecting 3-phase transmission lines using translay system of protection is

a) 6
b) 4
c) 3
d) 2

Ans: (d)

9. Mho relay is normally used for the protection of

a) Long transmission lines.
b) Medium length lines.
c) Short length lines.
d) No length criterion.

Ans: (a)

10. Resistance switching is normally resorted in case of

a) Bulk oil circuit breakers.
b) Minimum oil circuit breakers.
c) Air blast circuit breakers.
d) All types of breakers.

Ans: (c)

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