Multiple Choice
Which of the following medium is employed for extinction of arc in air circuit breaker ?
A) Water
B) Oil
C) Air
D) SF6
Correct Answer:
Verified
Correct Answer:
Verified
Q11: Circuit breakers are essentially<br>A)current carrying contacts called
Q12: Fault diverters are basically<br>A)fuses<br>B)relays<br>C)fast switches<br>D)circuit breakers
Q13: The relay operating speed depends upon<br>A)the spring
Q14: Circuit breakers usually operate under<br>A)transient state of
Q15: Thermal circuit breaker has<br>A)delayed trip action<br>B)instantaneous trip
Q17: Magnetic circuit breaker has _ trip action.<br>A)delayed<br>B)instantaneous<br>C)both
Q18: A transmission line is protected by<br>A)inrush protection<br>B)distance
Q19: Thermal overload relays are used to protect
Q20: A thermal protection switch can protect against<br>A)short-circuit<br>B)temperature<br>C)overload<br>D)over
Q21: Burden of a protective relay is the