Switchgear Protections Online Test - Set 04 - ObjectiveBooks

Switchgear Protections Online Test - Set 04

Practice Test: Question Set - 04

1. 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

2. The relay with inverse time characteristic will operate within
    (A) 1.5 sec
    (B) 5 to 10 sec
    (C) 5 to 20 sec
    (D) 20 to 30 sec

3. What will be the reflection coefficient 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

4. The torque produced in induction type relay (shaded pole structure) is
    (A) Inversely proportional to the current
    (B) Inversely proportional to the square of the current
    (C) Proportional to the current
    (D) Proportional to square of the current

5. Protection by fuses is generally not used beyond
    (A) 20 A
    (B) 50 A
    (C) 100 A
    (D) 200 A

6. A balanced 3-phase system consists of
    (A) Zero sequence currents only
    (B) Positive sequence currents only
    (C) Negative and zero sequence currents
    (D) Zero, negative and positive sequence currents

7. On which of the following routine tests are conducted?
    (A) Oil circuit breakers
    (B) Air blast circuit breakers
    (C) Minimum oil circuit breakers
    (D) All of the above

8. Overload relays are of _________ type.
    (A) Induction
    (B) Solid state
    (C) Thermal
    (D) All above

9. Burden of a protective relay is the power
    (A) Required to operate the circuit breaker
    (B) Absorbed by the circuit of relay
    (C) Developed by the relay circuit
    (D) None of the above

10. Interruption of large currents by relay requires
    (A) Arc suppressing blow out coils
    (B) Wide separation of the opened contacts
    (C) High speed opening of contacts
    (D) All of the above

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