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.Management Sciences
Category: Switchgear and Protection
H.R.C. fuses provide best protection against________________?
A. overload
B. reverse current
C. open-circuits
D. short-circuits
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
Which of the following parameter can be neglected for a short line ?
A. Inductance
B. Capacitance
C. Resistance
D. Reactance
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
Ionization in circuit breaker is facilitated by___________?
A. high temperature
B. increase of mean free path
C. increasing field strength
D. all of the above
A _________ is used to measure the stator % winding temperature of the generator?
A. thermocouple
B. pyrometer
C. resistance thermometer
D. thermometer
Which of the following devices will receive voltage surge first travelling on the transmission line ?
A. Lightning arresters
B. Relays
C. Step-down transformer
D. Switchgear
A thermal protection switch can protect against_____________?
A. short-circuit
B. temperature
C. overload
D. over voltage
Over voltage protection is recommended for______________?
A. hydro-electric generators
B. steam turbine generators
C. gas turbine generators
D. all of the above
E. none of the above
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