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Revesion 2

Quiz by Ali

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44 questions
Show answers
  • Q1
    Three phase transformer has................. Terminal
    6
    12
    10
    3
    30s
  • Q2
    The single phase transformer has ………………. Coil
    8
    1
    2
    12
    30s
  • Q3
    The coil which connected to load in transformer Name ……………. Coil.
    primary coil
    current coil
    secondary coil
    voltage coil
    30s
  • Q4
    The coil which connected to power supply in Transformer name ………. Coil
    Secondary coil.
    Main coil
    Primary coil
    Extra coil
    30s
  • Q5
    30s
  • Q6
    The picture shows …………… connection of 3 phase transformer
    Question Image
    D / Y
    Y / Y
    D / D
    Y / D
    30s
  • Q7
    the main parts of a synchronous generator
    stator frame
    stator core
    rotor
    All
    30s
  • Q8
    The correct tool to be used to replace the bearing of a motor is
    Pliers
    Bearing Puller
    Screw Driver
    Hammer and chisel
    30s
  • Q9
    Find the number of poles required on the rotor of generator whose output frequency is 50 HZ if ns=3000 R.P.M______
    2 HZ
    4pole
    2 pole
    6pole
    120s
  • Q10
    At what speed must be rotor of generator rotate to generate 50 HZ power in a four pole machine _____
    N=1800 R.P.M
    N= 3000 R.P.M
    N= 1500 R.P.M
    N= 15OO HZ
    120s
  • Q11
    the figure refers to________
    Question Image
    full load characteristic
    flow power diagram
    open circuit characteristic
    non of them
    120s
  • Q12
    The purpose of excitation …………..
    to use high speed
    to give the energy
    all of the
    To provide the field current for magnetizing the machine
    120s
  • Q13
    The relationship between speed, frequency and number of poles.
    f=(N*P)/120
    f=Ns-Nr
    F=1/T
    All of them
    30s
  • Q14
    The formula for voltage regulation is.......
    =[(VnL-VfL)/VfL]*100
    =VnL/VfL
    =[(VfL-VnL)/VfL]*100
    =[(VnL-VfL)/VnL]*100
    45s
  • Q15
    Three-phase induction motor is_________
    a machine, which convert the heating energy into mechanical energy.
    all the above
    a machine, which convert the mechanical energy into electrical energy.
    a machine, which convert the electrical energy into mechanical energy.
    45s

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