MCQs of Insulation co-ordination (Power System Planning and Design - 2180903)

Power System Planning and Design (2180903) MCQs

MCQs of Insulation co-ordination

Showing 31 to 40 out of 43 Questions

31.

A lightning arrestor is usually located nearer to

(a)	Busbar
(b)	Transformer
(c)	Circuit breaker
(d)	Isolator

32.

Which system will need the lightning arrester of least voltage rating?

(a)	Solid grounded neutral system
(b)	Resistance grounded neutral system
(c)	Reactance grounded neutral system
(d)	None of above

33.

Which of the following is used for providing protection against incoming surges?

(a)	Silicon oxide varistor
(b)	Germanium oxide varistor
(c)	Metal oxide varistor
(d)	All of above

34.

Angle of zone of protection of lightning protection system is approximately

(a)	10^o
(b)	20^o
(c)	45^o
(d)	70^o

35.

The property of surge protection device is to have __________________ V-I characteristics

(a)	Linear
(b)	Highly linear
(c)	Non-linear
(d)	Highly non-linear

36.

A grounding connection to earth from lightning protection system should be made at ______________________ corners of the structure

(a)	Any one
(b)	Any two
(c)	Diagonal
(d)	None of above

37.

The zone of protection i.e. surrounding area that a lightning protection system protects is approximately _______________ times the height of building protected.

(a)	2 times
(b)	3 times
(c)	4 times
(d)	5 times

38.

An air termination should exceed a minimum of ______________ above the object that is to be protected.

(a)	10 Inches
(b)	15 Inches
(c)	20 Inches
(d)	25 Inches

39.

Electrical arc occurs when the insulation is damaged and there is sufficient______________ between the conductors

(a)	Potential
(b)	Current
(c)	Power
(d)	All of above

40.

The arc will have ______________ on the nearby equipment

(a)	Thermal stresses only
(b)	Mechanical stresses only
(c)	Both (a) and (b)
(d)	None of above

Showing 31 to 40 out of 43 Questions