MCQ Knowledge Test on Switchgear Protections - Set 01

Practice Test: Question Set - 01


1. In order that current should flow without causing excessive heating or voltage drop, the relay contacts should
    (A) Have low contact resistance
    (B) Be clean and smooth
    (C) Be of sufficient size and proper shape
    (D) Have all above properties

2. A transmission line is protected by
    (A) Inrush protection
    (B) Distance protection
    (C) Time graded and current graded over current protection
    (D) Both (B) and (C)

3. The arc voltage produced in A.C. circuit breaker is always
    (A) In phase with the arc current
    (B) Lagging the arc current by 90°
    (C) Leading the arc current by 90°
    (D) None of the above

4. To protect most of the electrical equipment handling low power, the types of relays used are
    (A) Thermocouple
    (B) Electronic and bimetallic
    (C) Both (A) and (B)
    (D) None of the above

5. A.C. network analyzer is used to solve problems of
    (A) Load flow
    (B) Load flow and short-circuit
    (C) Load flow and stability
    (D) Load flow, short-circuit and stability

6. ________ relay is preferred for phase fault on short transmission line.
    (A) Induction type
    (B) Reactance
    (C) Impedance
    (D) None of the above

7. Which of the following parameter can be neglected for a short line?
    (A) Inductance
    (B) Capacitance
    (C) Resistance
    (D) Reactance

8. Air blast circuit breakers for 400 kV power system are designed to operate in
    (A) 100 microsecond
    (B) 50 millisecond
    (C) 0.5 sec
    (D) 0.1 sec

9. The steady state stability of the power system can be increased by
    (A) Connecting lines in parallel
    (B) Connecting lines in series
    (C) Using machines of high impedance
    (D) Reducing the excitation of machines

10. On which of the following effects of electric current a fuse operates?
    (A) Photoelectric effect
    (B) Electrostatic effect
    (C) Heating effect
    (D) Magnetic effect

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Item Reviewed: MCQ Knowledge Test on Switchgear Protections - Set 01 Rating: 5 Reviewed By: Pranab Debnath
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