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38 questions
Show answers
  • Q1
    Three phase voltage in Bahrain is
    240V
    415 V
    NONE OF THEM
    220 V
    30s
  • Q2
    Single phase voltage in Bahrain is
    240V
    NONE OF THEM
    415 A
    415 V
    30s
  • Q3
    ………….. , ………….. two types of rotor in S.G
    Non Salient pole rotor cylindrical Rotor
    Both (a) and (b)
    Salient pole rotor
    None of them
    30s
  • Q4
    The meaning of balanced load is
    VPH1 = VPH2 = VPH 3
    VL= VPH
    None of them
    Rph1 = Rph2 = Rph3
    30s
  • Q5
    The main advantages of using AC over DC for power generation
    possibility to use transformer
    possibility to use generator
    possibility to use motor
    possibility to use diode
    30s
  • Q6
    The current that passes through the neutral in balance load is:
    5V
    0A
    3A
    0 v
    30s
  • Q7
    In Delta connections, the line voltage is 415Vand the phase current is 15A. What is the line current ?
    IL= 1.73*15 = 25.9 A
    None of them
    VPH = 415 V
    I ph= 15 A
    30s
  • Q8
    For the three phase balanced star connected system shown in VL= 380 V, Rph = 20 Ω What is the Phase voltage
    219.6 V
    380V
    19A
    19V
    30s
  • Q9
    For the three phase balanced star connected system shown in Vph= 220 V, Rph = 20 Ω What is the Phase current
    19A
    IPH = Vph /Rph=220/20=11A
    19V
    219.6 V
    30s
  • Q10
    The Reactive power is……………..
    The real power dissipated in AC system((useful power )
    The voltage between 2 lines
    The power return to supply(not useful power )
    The power appears in load
    30s
  • Q11
    The meaning of connection of three-phase transformer ( Dy1)
    Primary connected delta, secondary connected star and angle=-30◦
    Primary connected delta, secondary connected star and angle=180◦
    Primary connected delta ,secondary connected delta and angle=0
    Primary connected delta ,secondary connected star and angle=+30◦
    30s
  • Q12
    the Formula of Active power in three phase system
    √3 VL IL sin⁡θ
    3 VL IL cos⁡θ
    both a & b
    √3 VL IL cos⁡θ
    30s
  • Q13
    What types of the figures show 3 phase transformer, Name it?
    Step up TRANSFORMER
    three single- phase transformers
    Step down TRANSFORMER
    SINGLE 3-PHASE TRANSFORMER
    30s
  • Q14
    Which type of transformer shown in the figure ?
    Question Image
    three single- phase transformers
    Step up TRANSFORMER
    SINGLE 3-PHASE TRANSFORMER
    Step down TRANSFORMER
    30s
  • Q15
    the main advantage of three single phase transformer is
    MORE EFFICIENT
    every unit in the bank could be replaced individually
    SMALLER
    CHEAPER
    30s

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