A. 1.5 sec
B. 5 to 10 sec
C. 5 to 20 sec
D. 20 to 30 sec
E. none of the above
Related Mcqs:
- Admittance relay is __________ relay?
A. impedance
B. directional
C. non-directional
D. 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 - In order that current should flow without causing excessive heating or voltage drop, the relay contacts should_________________?
A. have low contact resistance
B. be clean and smooth
C. be of sufficient size and proper shape
D. have all above properties - The relay operating speed depends upon_________________?
A. the spring tension
B. the rate of flux built up
C. armature core air gap
D. all of the above - 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 - Induction cup relay is operated due to changes in________________?
A. current
B. voltage
C. impedance
D. all of the above - The under voltage relay can be used for______________?
A. generators
B. busbars
C. transformers
D. motors
E. all of the above - relay is preferred for phase fault on short transmission line?
A. Induction type
B. Reactance
C. Impedance
D. None of the above - If the fault occurs near the impedance relay, the VII ratio will be____________?
A. constant for all distances
B. lower than that of if fault occurs away from the relay
C. higher than that of if fault occurs away from the relay
D. none of the above - The torque produced in induction type relay (shaded pole structure) is_____________?
A. inversely proportional to the current
B. inversely proportional to the square of the current
C. proportional to the current
D. proportional to square of the current
