A. single phase to ground faults
B. phase to phase faults
C. two phase to ground faults
D. three phase faults
E. any of these
Related Mcqs:
- To reduce short circuit fault currents are used_____________?
A. reactors
B. resistors
C. capacitors
D. none of the above - Interruption of large currents by relay requires______________?
A. arc suppressing blow out coils
B. wide separation of the opened contacts
C. high speed opening of contacts
D. all of the above - For which of the following protection from negative sequence currents is provided ?
A. Generators
B. Motors
C. Transmission line
D. Transformers - The short circuit in any winding of the transformer is the result of______________?
A. mechanical vibration
B. insulation failure
C. loose connection
D. impulse voltage - The short circuit in any winding of the transformer is the result of_______________?
A. mechanical vibration
B. insulation failure
C. loose connection
D. impulse voltage - A short-circuit is identified by_____________?
A. no current flow
B. heavy current flow
C. voltage drop
D. voltage rise - To limit short-circuit current in a power system are used______________?
A. earth wires
B. isolators
C. H.R.C. fuses
D. reactors - 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 - Circuit breakers are essentially______________?
A. current carrying contacts called electrodes
B. arc extinguishers
C. circuits to break the system
D. transformers to isolate the two systems
E. any 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
