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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