Electrical Wiring and Installation 9

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Objectives for Electrician and Wireman: Electrical Wiring and Installation 9

Part 9: Objective questions and answers of Electrical Wiring and Installation


Q1. The thread on conduit pipes in all cases should have a length of range:

a) 10 to 20 mm

b) 11 to 27 mm

c) 12 to 25 mm

d) 15 to 35 mm


Q2. What is the wall thickness of 25 mm heavy gauge metal conduit pipe?

a) 2.24 mm

b) 2.00 mm

c) 1.80 mm

d) 1.60 mm


Q3. The best suitable fish wire to be used in conduit runs is……..

a) GI wire

b) PVC wire

c) VIR wire

d) Aluminium wire


Q4. The length of the PVC channel for wiring is available:

a) 2 meter

b) 2.5 meter

c) 3.0 meter

d) 4.0 meter


Q5. The only wiring which can be taken through shortest route is the roof and required less right angle bends is:

a) Conduit surface wiring

b) Conduit concealed wiring

c) Casing and capping wiring

d) Batten wiring


Q6. Concealed PVC conduit wiring requires:

a) Inspection elbows, bends and Tee's

b) Solid elbows, bends and Tee's

c) Conduit saddles

d) Metal coupling with check nut


Q7. In which one of the following wirings, three two way switches only are required to operate three lamps?

a) Staircase wiring

b) Corridor wiring

c) Tunnel wiring

d) Godown wiring


Q8. A staircase point can be operated:

a) With one one-way and one two-way switches

b) With two one-way switches

c) With two two-way switches

d) With two intermediate switches


Q9. While fixing batten, the distance between the fixing screws should not exceed:

a) 75 cm

b) 7.5 cm

c) 75 mm

d) 7.5 mm


Q10. In wiring installation system tree system is most suitable for:

a) Multi storey building

b) Single storey building

c) Guest house accommodation

d) Multi room bungalows


Q11. PVC channel wiring is suitable for:

a) Godown wiring

b) Industrial wiring

c) Outdoor wiring

d) Indoor surface wiring


Q12. The number of wires of 4 sq. Mm drawn in a 20 mm x 10 mm casing and capping is:

a) 1

b) 2

c) 3

d) 4


Q13. Which type of wiring system shall not be used in places exposed to sun and rain?

a) Cleat wiring

b) Batten wiring

c) P.V.C. casing and capping

d) Metal conduit wiring


Q14. Though four branch circuits are planned for a domestic installation, only one cable was connected from the four circuits to the neutral link. This will result in:

a) All lamps give more than normal brightness

b) Over loading of the phase cable

c) Saving of cable for the customer

d) Neutral conductor gets over heated


Q15. The leakage current flowing in an installation is due to:

a) Improper earthing

b) High earth loop impedance

c) Insulation failure

d) Low earth resistance


Q16. As per BIS the measured insulation resistance of any wiring installation should not be less than:

a) 100 ohm

b) 1000 ohm

c) 100 k.ohm

d) 1000 k.ohm


Q17. Line clips are made out of:

a) Iron

b) Zinc

c) Nickel

d) Tin


Q18. The thickness of link clips of 30 SWG is:

a) 0.28 mm

b) 0.30 mm

c) 0.31 mm

d) 0.32 mm


Q19. What is the name of the material used for harnessing cables while making wiring connection of motor?

a) P.V.C. saddles

b) P.V.C. straps

c) P.V.C. trays

d) P.V.C. casting


Q20. Normal current capacity of a certain cable is 16 amperes. If the circuit is protected by the coarse excess current protection, then the current capacity of the cable will be:

a) 12 A

b) 13 A

c) 16 A

d) 20 A


Part 9: Objective questions and answers of Electrical Wiring and Installation


Q1. Answer b


Q2. Answer c


Q3. Answer a


Q4. Answer c


Q5. Answer b


Q6. Answer d


Q7. Answer c


Q8. Answer c


Q9. Answer c


Q10. Answer a


Q11. Answer d


Q12. Answer c


Q13. Answer b


Q14. Answer a


Q15. Answer c


Q16. Answer d


Q17. Answer d


Q18. Answer d


Q19. Answer b


Q20. Answer b

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