Multiple Choice
Overheating of relay contacts or contact born out is due to
A) slow making and breaking of load circuit contacts
B) foreign matter on the contact surface
C) too low contact pressure
D) all of the above
Correct Answer:
Verified
Correct Answer:
Verified
Q1: The voltage appearing across the contacts after
Q2: The time of closing the cycle, in
Q4: Large internal faults are protected by<br>A)merz price
Q5: Interruption of large currents by relay requires<br>A)arc
Q6: Resistance grounding is used for voltage between<br>A)33kVto66kV<br>B)HkVto33kV<br>C)3.3kVandllkV<br>D)none
Q7: In a circuit breaker the basic problem
Q8: H.R.C. fuses provide best protection against<br>A)overload<br>B)reverse current<br>C)open-circuits<br>D)short-circuits
Q9: Shunt capacitance is neglected while considering<br>A)short transmission
Q10: Protective relays are devices that detect abnormal
Q11: Ungrounded neutral transmission system is not recommended