(a) Triple pole iron clad switch
(b) Intermediate switch
(c) Miniature circuit breaker
(d) Earth leakage circuit breaker
Ans. (c) Miniature circuit breaker
Q.2. ELCB stands for ......
(a) Electrical Leakage Circuit Breaker
(b) Earth Leakage Current Breaker
(c) Earth Leakage Circuit Breaker
(d) Electrical Line Circuit Breaker
Ans. (a) Earth Leakage Circuit Breaker
Q.3. Earth Leakage Circuit Breaker (ELCB) works on the principle of ......
(a) Over load current
(b) Short circuit current
(d) Residual current
(c) Neutral current
Ans. (d) Residual current
Q.4. The ELCB expansion from is ......
(a) Earth Leakage Circuit Breaker
(b) Earth Leakage Control Breaker
(c) Earth Leakage Current Breaker
(d) Earth Leakage Component Breaker
Ans. (a) Earth Leakage Circuit Breaker
Q.5. An ELCB must always be connected in the circuit ......
(a) Before energy meter
(b) After energy meter
(c) At the entry of supply to load after energy meter
(d) Tail end of the installation
Ans. (c) At the entry of supply to load after energy meter
Q.6. ELCBs are specially used to disconnect the supply under ......
(a) Short circuit condition
(b) Ground fault condition
(c) Open circuit condition
(d) Over load condition
Ans. (b) Ground fault condition
Q.7. The expansion form of RCCB is ......
(a) Residual Current Circuit Breaker
(b) Residual Circuit Current Breaker
(c) Residual Current Control Breaker
(d) Residual Control Circuit Breaker
Ans. (a) Residual Current Circuit Breaker
Q.8. Expansion of MCCB is ......
(a) Moulded Case Circuit Breaker
(b) Main Case Circuit Breaker
(c) Main Control Circuit Breaker
(d) Main Current Circuit Breaker
Ans. (a) Moulded Case Circuit Breaker
Q.9. What is the purpose of earth leakage circuit breaker in building wiring installation?
(a) It protects the appliances from excess current
(b) It prevents the waste of electrical energy consumption
(c) It establishes the supply voltage
(d) It protects the energy meter from short circuit
Ans. (b) It prevents the waste of electrical energy consumption
Q.10. The main disadvantage of ELCB is ......
(a) Less reliable in operation
(b) Not easy to install
(c) Not easy to maintain
(d) More costly
Ans. (d) More costly
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