1. The code of practice for earthing is governed by [ a ]
(a) IS: 3043
(b) IS: 4340
(c) IS: 4340
(d) IS: 4430
Answer:(a) IS: 3043
2. The length of pipe electrode used for earthing should not be less than [ b ]
(a) 3.5 m
(b) 2.5 m
(c) 4.5 m
(d) 5 m
Answer : (d) 5 m
3. As per IS, the earthing electrode shall not be within a distance of ______ mtrs from any building being earthed. [ c ]
(a) 0.5 m
(b) 1 m
(c) 1.5 m
(d) 2 m
Answer : (c) 1.5 m
4. Maximum permissible earth resistance at large power stations is [ a ]
(a) 0.5 ohm
(b) 1 ohm
(c) 2 ohms
(d) 8 ohms
Answer :(a) 0.5 ohm
5. Maximum permissible earth resistance at major Sub-stations is [ b ]
(a) 0.5 ohm
(b) 1 ohm
(c) 2 ohms
(d) 8 ohms
Answer :(b) 1 ohm
6. Maximum permissible earth resistance at small Sub-stations is [ c ]
(a) 0.5 ohm
(b) 1 ohm
(c) 2 ohms
(d) 8 ohms
Answer :(c) 2 ohms
7. Maximum permissible earth resistance for buildings is [ d ]
(a) 0.5 ohm
(b) 1 ohm
(c) 2 ohms
(d) 8 ohms
Answer :(d) 8 ohms
8. Earth continuity inside an installation i.e. from plate earth to any point in installation should be [ b ]
(a) 0.5 ohm
(b) 1 ohm
(c) 2 ohms
(d) 8 ohms
Answer :(b) 1 ohm
9 The plate electrode of copper used for earthing should be with minimum size of [ c ]
(a) 50cm x 50cm x 3.15mm
(b) 50cm x 50cm x 6.3mm
(c) 60cm x 60cm x 3.15mm
(d) 60cm x 60cm x 6.3mm
Answer :(c) 60cm x 60cm x 3.15mm
10 The plate electrode of GI or steel used for earthing should be with minimum size of [ d ]
(a) 50cm x 50cm x 3.15mm
(b) 50cm x 50cm x 6.3mm
(c) 60cm x 60cm x 3.15mm
(d) 60cm x 60cm x 6.3mm
Answer :(d) 60cm x 60cm x 6.3mm
11 In pipe earthing, the minimum internal diameter for GI pipe should be [ b ]
(a) 30 mm
(b) 40 mm
(c) 50 mm
(d) 60 mm
Answer :(b) 40 mm
12 In pipe earthing, the minimum internal diameter for cast iron pipe should be [ c ]
(a) 80 mm
(b) 90 mm
(c) 100 mm
(d) 60 mm
Answer : (c) 100 mm
13 Copper strip electrodes used for earthing should not be less than [ c ]
(a) 22.5 mm x 1.60 mm
(b) 20 mm x 2.5 mm
(c) 25 x 1.60 mm
(d) 25 mm x 2.5 mm
Answer : (c) 25 x 1.60 mm
14 GI or Steel strip electrodes used for earthing should not be less than [ a ]
(a) 25 mm x 4mm
(b) 20 mm x 3 mm
(c) 25mm x 3mm
(d) 20mm x 4mm
Answer : (a) 25 mm x 4mm
15 Earthing arrangement for HT installations, substations and generating stations should be inspected at an interval of [ d ]
(a) 3 months
(b) 6 months
(c) 9 months
(d) 12 months
Answer : (d) 12 months
16 Earthing arrangement for low voltage installations such as service buildings, public buildings should be inspected at an interval of [ b ]
(a) 3 months (b) 6 months (c) 9 months (d) 12 months
Answer :(b) 6 months
17 Earthing arrangement for residential buildings should be inspected at an interval of [ b ]
(a) 3 months
(b) 6 months
(c) 9 months
(d) 12 months
Answer :(b) 6 months
18 Earthing arrangement for medium voltage installations should be inspected at an interval of [ d ]
(a) 3 months
(b) 6 months
(c) 9 months
(d) 12 months
Answer :(d) 12 months
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