Get ready for exam success with these wiring system MCQs based on domestic and industrial wiring practices.
11. In domestic wiring, the fuse or switch is always inserted in:
A) Series with the phase of supply ✅
B) Series with the neutral of supply
C) Parallel with the phase of supply
D) Series with the earthing of supply
Answer: A) Series with the phase of supply
Explanation: This ensures complete circuit disconnection during faults.
12. Grooves in cleat wiring are made of:
A) Porcelain ✅
B) Copper
C) Glass
D) Steel
Answer: A) Porcelain
Explanation: Porcelain insulates and provides mechanical support in cleat wiring.
13. In the CTS wiring system, CTS stands for:
A) Cable type sheathed
B) Core type sheathed
C) Cable tyre sheathed ✅
D) Core tyre sheathed
Answer: C) Cable tyre sheathed
Explanation: CTS cables are protected with a tough sheathing for insulation.
14. Which of the following is not used in domestic electrical wiring?
A) Fuse
B) Oil circuit breaker ✅
C) Lamp holder
D) Switch
Answer: B) Oil circuit breaker
Explanation: Oil circuit breakers are meant for high-voltage applications.
15. The material of wires used for making resistance standards is usually:
A) Manganin ✅
B) Nichrome
C) Copper
D) Phosphor bronze
Answer: A) Manganin
Explanation: Manganin’s low temperature coefficient ensures consistent resistance.
16. The wiring diagram shown represents:
A) Staircase wiring ✅
B) Go-down wiring
C) Hostel wiring
D) Tunnel wiring
Answer: A) Staircase wiring
Explanation: Staircase wiring allows controlling a light from two locations.
17. In CTS wiring, the cables are:
A) Laid on the surface of walls ✅
B) Buried underground
C) Suspended from ceilings
D) Embedded in concrete
Answer: A) Laid on the surface of walls
Explanation: Cables are fixed on wooden battens using clips.
18. Which type of wiring is considered the most expensive?
A) Cleat wiring
B) Conduit wiring ✅
C) CTS wiring
D) Casing and capping wiring
Answer: B) Conduit wiring
Explanation: Conduit wiring is costlier due to materials and labor involved.
19. The most suitable wiring system for temporary installations is:
A) Conduit wiring
B) Cleat wiring ✅
C) Casing and capping wiring
D) CTS wiring
Answer: B) Cleat wiring
Explanation: Cleat wiring is easy to install and ideal for temporary setups.
20. In conduit wiring, the conduits are made of:
A) Plastic
B) Lead
C) Steel or PVC ✅
D) Aluminum
Answer: C) Steel or PVC
Explanation: These materials offer durability and protection to wires.
21. The advantage of conduit wiring is:
A) Low cost
B) Easy to install
C) Protection against mechanical damage ✅
D) Suitable for temporary wiring
Answer: C) Protection against mechanical damage
Explanation: Wires are well protected against external forces.
22. In casing and capping wiring, the casing is usually made of:
A) Metal
B) Plastic
C) Wood ✅
D) Rubber
Answer: C) Wood
Explanation: Traditionally, wooden casings were used; some systems now use PVC.
23. The main disadvantage of cleat wiring is:
A) High cost
B) Complex installation
C) Poor appearance and less safety ✅
D) Not suitable for temporary wiring
Answer: C) Poor appearance and less safety
Explanation: Cleat wiring is exposed and not visually appealing.
24. Which wiring system is best suited for industrial areas?
A) Cleat wiring
B) Conduit wiring ✅
C) Casing and capping wiring
D) CTS wiring
Answer: B) Conduit wiring
Explanation: Conduit wiring provides superior protection and durability for industrial environments.
25. The standard color code for the earth wire is:
A) Red
B) Black
C) Green ✅
D) Yellow
Answer: C) Green
Explanation: Green is universally used to indicate the earth connection.
26. The standard color code for the neutral wire is:
A) Red
B) Black ✅
C) Green
D) Yellow
Answer: B) Black
Explanation: Black is the standard color for neutral wires in most wiring systems.