Multiple Choice
Protective relays are devices that detect abnormal conditions in electrical circuits by measuring
A) current during abnormal condition
B) voltage during abnormal condition
C) constantly the electrical quantities which differ during normal and abnormal conditions
D) none of the above
Correct Answer:

Verified
Correct Answer:
Verified
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
Q11: Ungrounded neutral transmission system is not recommended
Q12: To protect most of the electrical equipment
Q13: Which of the following is the least
Q14: For the protection of power station buildings
Q15: Insulation resistance of high voltage circuit breakers