A Best Way To Crack Gorenment Job Exams

Electrical Engineering Objective Questions { Power System }

197. In a circuit breaker, arc is initiated by the process of
A. thermal emission
B. field emission
C. alternators
D. transmission lines
Discuss in Forum

198. Buchholz relay is used for the protection of
A. switch yard
B. transformers
C. alternators
D. transmission lines
Discuss in Forum

199. The basic problem in a circuit breaker is to
A. maintain the arc
B. extinguish the arc
C. emit ionization electrons
D. none of these
Discuss in Forum

200. In oil and air blast circuit breakers, the current zero interruption is attained by
A. lengthening of arc
B. cooling and blast effect
C. deionizing the oil with forced air
D. both A and B above
Discuss in Forum

201. Air blast circuit breaker is operated at a pressure of
A. 5 to 10 kg/cm2
B. 10 to 15 kg/cm2
C. 15 to 20 kg/cm2
D. 20 to 30 kg/cm2
Discuss in Forum

202. The voltage appearing across the contacts after the opening of the circuit breaker is called
A. surge voltage
B. recovery voltage
C. arc voltage
D. break open voltage
Discuss in Forum

203. Buchholz relays are used for transformers of ratings above
A. 100 kV
B. 200 kV
C. 500 kV
D. 1000 kV
Discuss in Forum

Page 29 of 54

« 27 28  29  3031 »