A) 1 to 2 cycles B) 5 to 10 cycles C) 10 to 15 cycles D) Less than 50 cycles. Ans : (A)
A) minimum B) 0.5 C) 0.707 D) maximum. Ans : (D)
A) Operating mechanism B) Conservator C) Fixed and moving contacts D) Explosion pot. Ans : (B)
A) voltage at the faulty point B) total impedance up to the fault C) both (A) and (B) above D) none of the above. Ans: (C)
A) simplified design of earth fault protection B) over-voltages due to lighting can be discharged to the earth C) freedom from persistent arcing grounds D) all of the above. Ans : (D)
A) Air blast circuit breaker B) Minimum oil circuit breaker C) Plain oil circuit breaker D) All will produce same energy. Ans : (A)
A) When the power is to be supplied B) Whenever fault in the line occurs C) When the line is to be checked D) When the switch is put on Ans : (B)
A) low resistivity B) higher softening temperature C) low cost D) all of the above. Ans : (D)
A) Isolator B) Limit switch C) Earthing switch D) All of the above. Ans : (D)
A) thermal ionization of gas B) thermal emission from surface of contacts C) field emission from the surface of contacts D) any of the above. Ans : (D)