Switchgear Protections MCQ Practice Tests - Set 02 - ObjectiveBooks

Switchgear Protections MCQ Practice Tests - Set 02

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

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