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.Management Sciences
Category: Switchgear and Protection
In a single bus-bar system there will be complete shut down when____________?
A. fault occurs on the bus itself
B. fault occurs on neutral line
C. two or more faults occur simultaneously
D. fault occurs with respect to earthing
Resistance grounding is used for voltage between_________________?
A. 33kVto66kV
B. HkVto33kV
C. 3.3kVandllkV
D. none of the above
D.C. shunt relays are made of_____________?
A. few turns of thin wire
B. few turns of thick wire
C. many turns of thin wire
D. many turns of thick wire
A.C. network analyser is used to solve problems of_______________?
A. load flow
B. load flow and short-circuit
C. load flow and stability
D. load flow, short-circuit and stability
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 inductive interference between power and communication line can be minimized by__________?
A. transposition of the power line
B. transposition of the communication line
C. both (A) and (B)
D. increasing the distance between the conductors
Admittance relay is __________ relay?
A. impedance
B. directional
C. non-directional
D. none of the above
A fuse is never inserted in____________?
A. neutral wire
B. negative of D.C. circuit
C. positive of D.C. circuit
D. phase dine
What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?
A. Zero
B. Unity
C. Infinity
D. None of the above
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