DRDO CEPTAM Electrician Paper on Basic Wiring for Jan 2023 exam
Objective Questions on Basic Wiring for Electrician Trade
| Sr. No. | Questions with options |
| 1 | How the conduit pipes are specified?
(a) Length in meter (b) Wall thickness in mm (c) Inner diameter in mm (d) Outer diameter in mm Ans _ (d) |
| 2 | What is the fusing factor for rewireable fuse?
(a) 1.1 (b) 1.4 (c) 2.1 (d) 2.5 Ans- (b) |
| 3 | What is the purpose of underwriter’s knot for pendent holder connection?
(a) Avoid loose connections (b) Increase mechanical strength (c) Prevent excessive cap cover pressure (d) Reduce the strain from the terminals of accessories Ans – (d) |
| 4 | Which type of load in protected by the L-series MCB?
(a) Motors (b) Geyser (c) Hand tools (d) Air conditioner Ans- (b) |
| 5 | What is the effect of low current rated cable used to connect higher current load?
(a) Voltage drop increases (b) Load current increases (c) Voltage drop decreases (d) Cable damage due to heat Ans – (d) |
| 6 | How many two way switches with intermediate switch are used to control one lamp from three different places?
(a) 1 (b) 2 (c) 3 (d) 4 Ans-(b) |
| 7 | What is the advantage of concealed wiring?
(a) Easy to maintain (b) Less voltage drop (c) High insulation resistance (d) Protection against moisture Ans- (d) |
| 8 | What is the fusing factor for high rupturing capacity fuses (HRC)?
(a) 1.0 (b) 1.1 (c) 1.4 (d) 1.7 Ans –(b) |
| 9 | Which type of relay can be operated at both A.C and D.C?
(a) Ferred relay (b) Thermal relay (c) Impulse relay (d) Dry reed relay Ans –(c) |
| 10 | What is the purpose of the flexible cords in domestic wiring?
(a) Concealed wiring (b) Permanent connection (c) Run cable through holes in ceiling (d) Connection transportable appliances Ans – (d) |
| 11 | Which type of circuit breaker is used above 100 A current rating?
(a) Miniature circuit breaker (MCB) (b) Earth leakage circuit breaker (ELCB) (c) Moulded case circuit breaker (MCCB) (d) Residual current circuit breaker (RCCB) Ans – (c) |
| 12 | What is the purpose of tin coating on copper fuse wire?
(a) Withstand high temperature (b) Increase the fusing factor (c) Prevent oxidation of copper wire (d) Increase the mechanical strength Ans –(c) |
| 13 | What is the name of the four insulated conductors group?
(a) Pair (b) Core (c) Quad (d) Layer Ans – (c) |
| 14 | How many two way switches are required in godown wiring circuit to control four lamps?
(a) 2 (b) 3 (c) 4 (d) 5 Ans – (b) |
| 15 | Why tree system of wiring most suitable for multistoried building?
(a) Easy load balancing (b) Constant voltage distribution (c) Offers minimum voltage drop (d) Easy in fault finding with many fuses Ans – (d) |
| 16 | Which is used as a filter material for fixing screw hole on ceiling?
(a) Paper (b) Nylon (c) Cement (d) Poly vinyl chloride Ans – (b) |
| 17 | Where the iron clad double pole (ICDP) main switch is used?
(a) Large industrial installations (b) Control main or branch circuits (c) Single phase domestic installations (d) Three phase power circuit installations Ans – (c) |
| 18 | Which electrical accessory belongs to general classification of accessories?
(a) Fuse (b) Ceiling roses (c) Intermediate switch (d) Pendent lamp holder Ans –(b) |
| 19 | Which is the application of DC series MCB?
(a) AC motor (b) DC motor (c) Locomotives (d) Air conditioners Ans – (c) |
| 20 | What is the term for the time taken by a fuse to interrupt the circuit in fault?
(a) Time factor (b) Fusing factor (c) Cut-off factor (d) Fusing current Ans- (c) |
| Published On – 6th June 2022 | |
Leave a Reply