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EE/SLP-EleTroTwo

Quiz by Dr. Joseph

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286 questions
Show answers
  • Q1
    A relay in which the measurement is performed by a stationary circuit and which has no moving parts is called
    static relay
    different relay
    instantaneous relay
    time relay
    30s
  • Q2
    For high voltage ac circuit breakers, the rated short circuit current is passed for ___ seconds
    20
    3
    0.1
    30
    30s
  • Q3
    Which of the following is not a type of contractor for circuit breakers?
    pneumatic
    electro-pneumatic
    electro-pneumatic
    vacuum
    30s
  • Q4
    Interrupting medium in a contactor for circuit breakers may be
    any of these
    oil
    SF6gas
    air
    30s
  • Q5
    Which of the following circuit breakers has the lowest voltage range?
    air blast
    air break
    SF6
    tank type oil
    30s
  • Q6
    Which of the following materials is not used in extinguishingthe arc in case of a circuit breaker?
    air
    water
    vacuum
    SF6
    30s
  • Q7
    The transient voltage that appears across the contacts of a circuit breaker at the instant of arc extinction is called
    restriking voltage
    recovery voltage
    supply voltage
    peak voltage
    30s
  • Q8
    A relay used for protection of motors against overload
    impedance relay
    Buchholz relay
    magnetic relay
    thermal relay
    30s
  • Q9
    The number of cycles in which a high speed circuit breaker can complete its operation is
    40 to 50
    10 to 18
    20 to 30
    3 to 8
    30s
  • Q10
    A material best suited for manufacturing of fuse wire is
    copper
    silver
    aluminum
    lead
    30s
  • Q11
    In a circuit breaker, the current which exist at the instant of contact separation is called
    surge current
    recovery current
    restriking current
    interrupting current
    30s
  • Q12
    A Merz-Price protection is suitable for
    feeders
    tranmission lines
    transformer
    alternators
    30s
  • Q13
    Interrupting capacity of a circuit breaker is usually expressed in
    MVA
    amperes
    volts
    MW
    30s
  • Q14
    Which of the following contact point metals has the highest melting point?
    copper
    gold
    silver
    tungsten
    30s
  • Q15
    Sparking occurs when a load is switched off because the circuit has
    none of these
    high resistance
    high capacitance
    high inductance
    30s

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