Testing And Commissioning Of Electrical Equipment’S Set 10

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 10

Q1 | Large internal faults are protected by
  • Merz price percentage differential protection
  • Mho and ohm relays
  • Horan gaps and temperature relays
  • Earth fault and positive sequence relays
Answer: Merz price percentage differential protection
Q2 | Which of the following is the least expensive protection for over current in lowvoltage system ?
  • Rewireable fuse
  • Isolator
  • Oil circuit breaker
  • Air break circuit breaker
Answer: Rewireable fuse
Q3 | For the protection of power station buildings against direct strokes therequirements are
  • Interception
  • Interception and conduction
  • Interception, conduction and dissipation
  • Interception,conduction,dissipation and reflection
Answer: Interception, conduction and dissipation
Q4 | The line insulation is............. the insulation level at the station equipment
  • Less than
  • Same as
  • More than
  • Not directly related with
Answer: Not directly related with
Q5 | Short-circuit currents are due to
  • Single phase to ground faults
  • Phase to phase faults
  • Three phase faults
  • Any of these
Answer: Any of these
Q6 | For which of the following protection from negative sequence current is provided?
  • Generators
  • Motors
  • Transmission line
  • Transformers
Answer: Generators
Q7 | For which of the following ratings of the transformer differential protection isrecommended?
  • Above 30 KVA
  • Equal to and above 5 MVA
  • Equal two and above 25 MVA
  • None of the above
Answer: Equal to and above 5 MVA
Q8 | Over voltage protection is recommended for
  • Hydro electric generators
  • Steam turbine generators
  • Gasturbine generators
  • All of the above
Answer: All of the above
Q9 | 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
Q10 | Hey switchgear is device used for
  • Interrupting an electrical circuit
  • Switching an electrical circuit
  • Reaching and controlling an electrical circuit
  • Switching, controlling and protecting the electrical circuit and equipment
Answer: Switching, controlling and protecting the electrical circuit and equipment
Q11 | Switching over voltage arc are more hazardous than lighting surges in case of
  • Unbalanced systems
  • Low-voltages
  • 11 KV systems
  • EHV and UHV systems
Answer: EHV and UHV systems
Q12 | Least number of faults are generally reported for
  • Transmission lines
  • Cables
  • Switchgears
  • Transformers
Answer: Cables
Q13 | Minimum working voltage will be least in case of
  • Silver
  • Graphite
  • Carbon
  • Tungsten
Answer: Silver
Q14 | In a contactor, interrupting medium may be
  • Air
  • Oil
  • Sf6 gas
  • Any of the above
Answer: Any of the above
Q15 | The transient voltages that appears across the contacts at the instant of arcextinction is called ..............voltage
  • Supply
  • Recovery
  • Restriking
  • Peak
Answer: Restriking
Q16 | The power loss is an important factor for the design of
  • Transmission line
  • Motor
  • Generator
  • Feeder
Answer: Motor
Q17 | SF6 gas
  • Is yellow in colour
  • Is lighter than air
  • Is non-toxic
  • Has pungent small
Answer: Is non-toxic
Q18 | SF6 gas is transported in
  • Air cylinders
  • Gas cylinders
  • Liquid from in cylinders
  • Solid form in boxes
Answer: Liquid from in cylinders
Q19 | The short-circuit in any winding of the transformer is the result of
  • Mechanical vibration
  • Insulation failure
  • Loose connection
  • Impulse voltage
Answer: Impulse voltage
Q20 | The actuating quantity for the relays may be
  • Magnitude
  • Frequency
  • Phase angle
  • Any of the above
Answer: Any of the above
Q21 | The operating speed of a relay depends upon the
  • Rate of flux built up
  • Armature core air gap
  • Spring tension
  • All of these
Answer: All of these
Q22 | Inverse time current relays are used for the protection of
  • Feeders
  • Transformers
  • Alternators
  • Both A and B
Answer: Both A and B
Q23 | IDMT relays are used to protect the power transformers against
  • External short-circuit
  • Over loads
  • Internal short-circuits
  • Both A and B
Answer: Both A and B
Q24 | In distance protection, the relay measures
  • Negative sequence impedance of the light from relay up to the fault point
  • Positive sequence impedance of the line from relay up to the fault point
  • Self impedance of the line from relay up to the fault point
  • Zero sequence impedance of the line from relay up to the fault point
Answer: Positive sequence impedance of the line from relay up to the fault point
Q25 | The relay used for phase fault protection of short transmission lines is
  • Reactance relay
  • Impedance relay
  • Mho relay
  • IDMT relay
Answer: Reactance relay
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