(A) Rule 30
(B) Rule 33
(C) Rule 77
(D) All these
Answer - (D)
2. Which of the following is a demerit of the underground Service Main?
(A) ugly form
(B) Repeated mistake
(C) expensive
(D) All these
Answer - (C)
3. To what extent is the Underground Service Line used?
(A) Distance more than 25 meters
(B) Distance more than 100 meters
(C) Distance less than 1 km
(D) Distance more than 1 km
Answer- (A)
4. What is the diameter of the GI pipe through which the earth wire needs to be ejected?
(A) 13 mm diameter
(B) 15 mm diameter
(C) 19 mm diameter
(D) 6 mm diameter
Answer- (A)
5. What should be the value of earthing resistance for large power stations?
(A) 1 Ω
(B) 0.5 Ω
(C) 2 Ω
(D) 5 Ω
Answer (B)
6. What type of earthing is used by transmission lines?
(A) Earthing of Plate
(B) Rod earthing
(C) strip earthing
(D) Both (A) and (C)
Answer - (C)
7. What is the size of copper strips used for strip earthing?
(A) 25 mm * 4 mm
(B) 25 mm * 3 mm
(C) 30 mm * 4 mm
(D) 30 mm * 3 mm
Answer- (A)
8. Which type of earthing is also called 'fire earthing'?
(A) Earthing of Plate
(B) Rod earthing
(C) strip earthing
(D) All these
Answer (B)
9. Factors on which soil resistance depends:
(A) electrode depth
(B) moisture
(C) Nacl
(D) All of the above
Answer - (D)
10. Grounding is generally provided for:
(A) For the protection of equipment only
(B) For the safety of operating personnel only
(C) Both (A) and (B)
(D) None of the above
Answer - (C)