Practice Test: Question Set - 02
1. 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
2. A short-circuit is identified by
- (A) No current flow
- (B) Heavy current flow
- (C) Voltage drop
- (D) Voltage rise
3. 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
4. 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
5. Over voltage protection is recommended for
- (A) Hydroelectric generators
- (B) Steam turbine generators
- (C) Gas turbine generators
- (D) All of the above
6. Series reactors should have
- (A) Low resistance
- (B) High resistance
- (C) Low impedance
- (D) High impedance
7. _________ relays are used for phase faults on long line.
- (A) Impedance
- (B) Reactance
- (C) Either of the above
- (D) None of the above
8. Induction cup relay is operated due to changes in
- (A) Current
- (B) Voltage
- (C) Impedance
- (D) All of the above
9. For the protection of power station buildings against direct strokes the requirements are
- (A) Interception
- (B) Interception and conduction
- (C) Interception, conduction and dissipation
- (D) Interception, conduction, dissipation and
reflection
10. The time of closing the cycle, in modern circuit breakers is
- (A) 0.003 sec
- (B) 0.001 sec
- (C) 0.01 sec
- (D) 0.10 sec