A. heavy loads
B. internal short-circuits
C. external short-circuits
D. all of the above
Related Mcqs:
- The single phasing relays are used for the protection of_____________?
A. single phase motors only
B. two phase motors only
C. two single phase motors running in parallel
D. three phase motors - Thermal overload relays are used to protect the motor against over current due to____________?
A. short-circuits
B. heavy loads
C. grounds
D. all of the above - For which of the following ratings of the transformer differential protection is recommended ?
A. above 30 kVA.
B. equal to and above 5 MVA
C. equal to and above 25 MVA
D. none of the above - The relay with inverse time characteristic will operate within____________?
A. 1.5 sec
B. 5 to 10 sec
C. 5 to 20 sec
D. 20 to 30 sec
E. none of the above - Overload relays are of_______________type
A. induction
B. solid state
C. thermal
D. electromagnetic
E. all above - D.C. shunt relays are made of_____________?
A. few turns of thin wire
B. few turns of thick wire
C. many turns of thin wire
D. many turns of thick wire - Directional relays are based on flow of____________?
A. power
B. current
C. voltage wave
D. all of the above - 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 - Relays can be designed to respond to changes in________________?
A. resistance, reactance or impedance
B. voltage and current
C. light intensity
D. temperature
E. all above - relays are used for phase faults on long line?
A. Impedance
B. Reactance
C. Either of the above
D. None of the above
