Objective Questions on Circuit Breakers and Relaystion for Electrician Trade
| Sr. No. | Questions with options |
| 1 | Which circuit breaker is installed along with wiring circuit against leakage current protection?
(a) OCB (b) MCB (c) ELCB (d) MCCB Ans –(c) |
| 2 | Which relay hold their contacts in position after power is cutoff?
(a) Read relay (b) Current relay (c) Voltage relay (d) Latching relay Ans – (d) |
| 3 | How the rupturing capacity of circuit breaker is rated?
(a) KV (b) KW (c) MVA (d) KVAR Ans – (c) |
| 4 | What is the pick-up voltage in a over voltage relay indicated?
(a) Working voltage of relay (b) Maximum voltage rating of relay (c) Minimum voltage rating of relay (d) Minimum voltage to start the relay Ans –(d) |
| 5 | What si the function of Buchholz relay in power transformer?
(a) Over load and short circuit protection (b) Over voltage and earth fault protection (c) Open circuit and earth fault protection (d) Open circuit and over voltage protection Ans – (a) |
| 6 | Which type of load is protected by G’ series MCB?
(a) Ovens (b) Geysers (c) Air conditioners (d) General lighting systems Ans – (c) |
| 7 | Which type of relay is used in both A.C and D.C supply?
(a) Reed relay (b) Impulse relay (c) Thermal relay (d) Clapper-type armature relay Ans – (b) |
| 8 | Which circuit breaker is used as a switch and protective device in the domestic writing circuit?
(a) Air circuit breaker (b) Miniature circuit breaker (c) Moulded case circuit breaker (d) Earth leakage circuit breaker Ans – (b) |
| 9 | What is the purpose of trip coil used in circuit breakers?
(a) Easy operation (b) Remote operation (c) Accurate operation (d) Emergency operation Ans – (b) |
| 10 | What is the function of relay to the breaking operation of circuit breaker in control unit?
(a) Sensing the fault quantities (b) Analyzing the condition of breaker (c) Controlling the speed in case of fault (d) Interpreting the fault situation to operate Ans – (d) |
| Published On – 15th June 2022 | |
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