Switchgear and Protection Electrical Engineering MCQ Questions - Set 05 - ObjectiveBooks

Switchgear and Protection Electrical Engineering MCQ Questions - Set 05

Practice Test: Question Set - 05

1. Which of the following is the least expensive protection for over-current is low voltage system?
    (A) Rewirable fuse
    (B) Isolator
    (C) Oil circuit breaker
    (D) Air break circuit breaker

2. The interaction between a transmission line and communication line is minimized by
    (A) Transposing transmission as well as communication lines
    (B) Increasing the height of the transmission line tower
    (C) Increasing the distance between the two lines
    (D) All of the above

3. To reduce short circuit fault currents are used.
    (A) Reactors
    (B) Resistors
    (C) Capacitors
    (D) None of the above

4. The under voltage relay can be used for
    (A) Generators
    (B) Bus-bars
    (C) Transformers
    (D) All of the above

5. Over-fluxing protection is recommended for
    (A) Distribution transformer
    (B) Generator transformer of the power plant
    (C) Autotransformer of the power plant
    (D) Station transformer of the power plant

6. The fuse rating is expressed in terms of
    (A) Current
    (B) Voltage
    (C) VAR
    (D) kVA

7. By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated?
    (A) Radiation
    (B) Convection
    (C) Conduction
    (D) All of the above

8. SF6 gas
    (A) Is yellow in color
    (B) Is lighter than air
    (C) Is nontoxic
    (D) Has pungent small

9. Thermal overload relays are used to protect the motor against over current due to
    (A) Short-circuits
    (B) Heavy loads
    (C) Grounds
    (D) All of the above

10. Large internal faults are protected by
    (A) Merz-price percentage differential protection
    (B) Mho and ohm relays
    (C) Horn gaps and temperature relays
    (D) Earth fault and positive sequence relays

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