Power System Planning and Design (2180903) MCQs

MCQs of Power system earthing

Showing 11 to 20 out of 30 Questions
1 2 3
11.
Ground resistance value for sensitive installations is
(a) Less than 5 Ω
(b) More than 5 Ω
(c) Equal to 50 Ω
(d) Any of above
Answer:

Option (a)

12.
Doubling the length of the ground electrode will cause resistance to
(a) Increase by 10%
(b) Increase by 40%
(c) Decrease by 10%
(d) Decrease by 40%
Answer:

Option (d)

13.
The easiest method for earth resistance measurement
(a) Selective measurement
(b) Fall of potential
(c) Stake-less measurement
(d) Any of above
Answer:

Option (c)

14.
Earth pit is filled with
(a) Aluminum and Iron
(b) Graphite and Silver
(c) Graphite and magnesium
(d) Salt and charcoal
Answer:

Option (d)

15.
What is the specification of GI earth plate?
(a) 60 cm × 60 cm × 3 mm
(b) 60 cm × 60 cm × 4 mm
(c) 60 cm × 60 cm × 5 mm
(d) 60 cm × 60 cm × 6 mm
Answer:

Option (d)

16.
What is the amount of charcoal and salt needed for GI Pipe earthing?
(a) Charcoal 5 kg, salt 8 kg
(b) Charcoal 5 kg, salt 5 kg
(c) Charcoal 10 kg, salt 10 kg
(d) Charcoal 10 kg, salt 8 kg
Answer:

Option (c)

17.
Which IE rule is applicable to service mains?
(a) Rule 30
(b) Rule 33
(c) Rule 77
(d) All of above
Answer:

Option (d)

18.
What is the diameter of the GI pipe through which the earth wire needs to be taken out?
(a) 6 mm
(b) 13 mm
(c) 15 mm
(d) 19 mm
Answer:

Option (b)

19.
What should be the value of earthing resistance for large power stations?
(a) 0.5 Ω
(b) 1.0 Ω
(c) 2.0 Ω
(d) 5.0 Ω
Answer:

Option (a)

20.
_________________earthing is used for transmission lines
(a) Pipe
(b) Plate
(c) Strip
(d) All of above
Answer:

Option (c)

Showing 11 to 20 out of 30 Questions
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