A. short-circuit
B. temperature
C. overload
D. over voltage
Related Mcqs:
- 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 - To protect most of the electrical equipment handling low power, the types of relays used are______________?
A. thermocouple
B. electronic and bimetallic
C. both (A) and (B)
D. none of the above - For the protection of power station buildings against direct strokes the requirements are___________?
A. interception
B. interception and conduction
C. interception, conduction and dissipation
D. interception, conduction, dissipation and reflection
E. none of the above - The delay fuses are used for the protection of ___________?
A. motors
B. power outlet circuits
C. fluorescent lamps
D. light circuits - Which of the following is the least expensive protection for overcurrent is low voltage system ?
A. Rewireable fuse
B. Isolator
C. Oil circuit breaker
D. Air break circuit breaker
E. None of the above - The inverse definite mean time relays are used for over current and earth fault protection of transformer against_________________?
A. heavy loads
B. internal short-circuits
C. external short-circuits
D. all of the above - 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 - 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 - A fuse in a motor circuit provides protection against__________?
A. overload
B. short-circuit and overload
C. open circuit, short-circuit and overload
D. none of the above - Protection by fuses is generally not used beyond__________?
A. 20 A
B. 50 A
C. 100 A
D. 200 A
