Testing And Commissioning Of Electrical Equipment’S Set 4

Electrical Engineering

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This set of Testing and Commissioning of Electrical Equipment’s Multiple Choice Questions & Answers (MCQs) focuses on Testing And Commissioning Of Electrical Equipment’S Set 4

Q1 | Over voltage protection is recommended for
  • hydro-electric generators
  • steam turbine generators
  • gas turbine generators
  • all of the above
Answer: all of the above
Q2 | Air blast circuit breakers for 400 kV power system are designed to operate in
  • 100 microsecond
  • 50 millisecond
  • 0.5 sec
  • 0.1 sec
Answer: 50 millisecond
Q3 | Overfluxing protection is recommended for
  • distribution transformer
  • generator transformer of the power plant
  • auto-transformer of the power plant
  • station transformer of the power plant
Answer: generator transformer of the power plant
Q4 | Series capacitors are used to
  • compensate for line inductive reactance
  • compensate for line capacitive reactance
  • improve line voltage
  • none of the above
Answer: compensate for line inductive reactance
Q5 | Admittance relay is _______ relay.
  • impedance
  • directional
  • non-directional
  • none of the above
Answer: directional
Q6 | The material used for fuse must have
  • low melting point and high specific resistance
  • low melting point and -low specific resistance
  • high melting point and low specific resistance
  • low melting point and any specific resistance
Answer: low melting point and high specific resistance
Q7 | If the fault occurs near the impedance relay, the VII ratio will be
  • constant for all distances
  • lower than that of if fault occurs away from the relay
  • higher than that of if fault occurs away from the relay
  • none of the above
Answer: lower than that of if fault occurs away from the relay
Q8 | The torque produced in induction type relay (shaded pole structure) is
  • inversely proportional to the current
  • inversely proportional to the square of the current
  • proportional to the current
  • proportional to square of the current
Answer: inversely proportional to the square of the current
Q9 | The steady state stability of the power system can be increased by
  • connecting lines in parallel
  • connecting lines in series
  • using machines of high impedance
  • reducing the excitation of machines
Answer: connecting lines in parallel
Q10 | The inductive interference between power and communication line can beminimized by
  • transposition of the power line
  • transposition of the communication line
  • both (A) and (B)
  • increasing the distance between the conductors
Answer: both (A) and (B)
Q11 | The power loss is an important factor for the design of
  • transmission line
  • motor
  • generator
  • feeder
Answer: transmission line
Q12 | A fuse is connected
  • in series with circuit
  • in parallel with circuit
  • either in series or in parallel with circuit
  • none of the above
Answer: in series with circuit
Q13 | H.R.C. fuse, as compared to a rewirable fuse, has
  • no ageing effect
  • high speed of operation
  • high rupturing capacity
  • all of the above
Answer: all of the above
Q14 | The fuse rating is expressed in terms of
  • current
  • voltage
  • VAR
  • kVA
Answer: current
Q15 | The fuse blows off by
  • burning
  • arcing
  • melting
  • none of the above
Answer: melting
Q16 | On which of the following effects of electric current a fuse operates ?
  • Photoelectric effect
  • Electrostatic effect
  • Heating effect
  • Magnetic effect
Answer: Heating effect
Q17 | An isolator is installed
  • to operate the relay of circuit breaker
  • as a substitute for circuit breaker
  • always independent of the position of circuit breaker
  • generally on both sides of a circuit breaker
Answer: generally on both sides of a circuit breaker
Q18 | A fuse in a motor circuit provides protection against
  • overload
  • short-circuit and overload
  • open circuit, short-circuit and overload
  • none of the above
Answer: short-circuit and overload
Q19 | Protection by fuses is generally not used beyond
  • 20 A
  • 50 A
  • 100 A
  • 200 A
Answer: 100 A
Q20 | A fuse is never inserted in
  • neutral wire
  • negative of D.C. circuit
  • positive of
  • C. circuit
Answer: neutral wire
Q21 | Which of the following circuit breakers is used for the railway electrification?
  • Air blast circuit breaker
  • SF6 circuit breaker
  • Bulk oil circuit breaker
  • Minimum oil circuit breaker
Answer: Air blast circuit breaker
Q22 | The stability of arc in vacuum depends on _________.
  • The contact material only.
  • The circuit parameters only.
  • The contact materials and its vapour pressure.
  • Both (b) and (c)
Answer: Both (b) and (c)
Q23 | SF6 is which type of gas?
  • Electro positive
  • Electro negative
  • Both (a) and (b)
  • None of these
Answer: Both (a) and (b)
Q24 | What is the average rate of rise of restriking voltage upto the first peak?
  • 525 * 103kV / sec
  • 453 * 103kV / sec
  • 582 * 103 kV / sec
  • 467 * 103 kV / sec
Answer: 453 * 103kV / sec
Q25 | Circuit breakers usually operate under
  • Steady short circuit current
  • Sub transient state of short circuit current
  • Transient state of short circuit current
  • None of these
Answer: Sub transient state of short circuit current
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