a) Bulk oil circuit breakers b) Minimum oil circuit breakers c) Air break circuit breakers d) None of these Ans: (c)
a) Over voltage b) Short circuit c) Temperature rise d) Overload Ans: (d)
a) Away from the circuit breaker b) Near the transformer c) Away from the transformer d) Near the circuit breaker Ans: (b)
a) 2.11 kV rms/cm b) 21.1 kV rms/m c) 211 kV rms/cm d) 2110 kV rms/m Ans: (b)
a) Inverse shunt trip b) Shunt trip c) Time delay trip d) Both (a) and (c) above Ans: (b)
a) In phase opposition to the arc current b) In phase with the arc current c) Iagging the arc current by 45° d) Leading the arc current by 90° Ans: (b)
a) 2 to 3 cycles b) 6 to 12 cycles c) 3 to 8 cycles d) 10 to 20 cycles Ans: (c)
a) 1 kA b) 5 kA c) 10 kA d) 50 kA Ans: (c)
a) Zero leading b) Zero lagging c) Unity d) Any value from zero to unity Ans: (c)
a) Short duty b) Repeated duty c) Intermittent duty d) None of these Ans: (b)
MCQ of Transformer page-20:91. All day efficiency of a distribution transformer is ………. its commercial efficiency.
MCQ of Transformer page-19:81. Which of the following is not a fitting on the transformer ?
MCQ of Transformer page-18:71. The short circuit test on a transformer gives its