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.Management Sciences
Category: Switchgear and Protection
Series reactors should have________________?
A. low resistance
B. high resistance
C. low impedance
D. high impedance
Distance relays are generally_____________?
A. split-phase relays
B. reactance relays
C. impedance relays
D. none of the above
The reflection co-efficient at the open circuited end of a transmission line___________?
A. zero
B. infinity
C. unity
D. 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
transmission line has reflection coefficient as one?
A. Open circuit
B. Short-circuit
E. Long
D. None of the above
Bus coupler is very essential in arrangement______________?
A. single bus
B. double bus, double breaker
C. main and transfer bus
D. all of the above
Shunt capacitance is neglected while considering______________?
A. short transmission line
B. medium transmission line
C. long transmission line
D. medium and long transmission lines
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
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
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