MCQs on Switchgear and Protection - Set 06 - ObjectiveBooks

MCQs on Switchgear and Protection - Set 06

Practice Test: Question Set - 06

1. Shunt capacitance is neglected while considering
    (A) Short transmission line
    (B) Medium transmission line
    (C) Long transmission line
    (D) Medium and long transmission lines

2. Wave trap is used to trap waves of
    (A) Power frequencies
    (B) Higher frequencies entering generator or transformer units
    (C) Either of the above
    (D) None of the above

3. Which of the following statements is incorrect?
    (A) Lightning arrestors are used before the switchgear
    (B) Shunt reactors are used as compensation reactors
    (C) The peak short current is (1.8 × V2) times the A.C. component
    (D) The MVA at fault is equal to base MVA divided by per unit equivalent fault reactance

4. The single phasing relays are used for the protection of
    (A) Single phase motors only
    (B) Two phase motors only
    (C) Two single phase motors running in parallel
    (D) Three phase motors

5. Admittance relay is ________ relay.
    (A) Impedance
    (B) Directional
    (C) Non-directional
    (D) None of the above

6. An isolator is installed
    (A) To operate the relay of circuit breaker
    (B) As a substitute for circuit breaker
    (C) Always independent of the position of circuit breaker
    (D) Generally on both sides of a circuit breaker

7. The information to the circuit breaker under fault conditions is provided by
    (A) Relay
    (B) Rewirable fuse
    (C) H.R.C. only
    (D) All of the above

8. The arcing contacts in a circuit breaker are made of
    (A) Copper tungsten alloy
    (B) Porcelain
    (C) Electrolytic copper
    (D) Aluminium alloy

9. Relays can be designed to respond to changes in
    (A) Resistance, reactance or impedance
    (B) Voltage and current
    (C) Light intensity
    (D) All above

10. A differential relay measures the vector difference between
    (A) Two currents
    (B) Two voltages
    (C) Two or more similar electrical quantities
    (D) None of the above

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