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38 questions
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- Q1Three phase voltage in Bahrain is240V415 VNONE OF THEM220 V30sEditDelete
- Q2Single phase voltage in Bahrain is240VNONE OF THEM415 A415 V30sEditDelete
- Q3………….. , ………….. two types of rotor in S.GNon Salient pole rotor cylindrical RotorBoth (a) and (b)Salient pole rotorNone of them30sEditDelete
- Q4The meaning of balanced load isVPH1 = VPH2 = VPH 3VL= VPHNone of themRph1 = Rph2 = Rph330sEditDelete
- Q5The main advantages of using AC over DC for power generationpossibility to use transformerpossibility to use generatorpossibility to use motorpossibility to use diode30sEditDelete
- Q6The current that passes through the neutral in balance load is:5V0A3A0 v30sEditDelete
- Q7In Delta connections, the line voltage is 415Vand the phase current is 15A. What is the line current ?IL= 1.73*15 = 25.9 ANone of themVPH = 415 VI ph= 15 A30sEditDelete
- Q8For the three phase balanced star connected system shown in VL= 380 V, Rph = 20 Ω What is the Phase voltage219.6 V380V19A19V30sEditDelete
- Q9For the three phase balanced star connected system shown in Vph= 220 V, Rph = 20 Ω What is the Phase current19AIPH = Vph /Rph=220/20=11A19V219.6 V30sEditDelete
- Q10The Reactive power is……………..The real power dissipated in AC system((useful power )The voltage between 2 linesThe power return to supply(not useful power )The power appears in load30sEditDelete
- Q11The 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=0Primary connected delta ,secondary connected star and angle=+30◦30sEditDelete
- Q12the Formula of Active power in three phase system√3 VL IL sinθ3 VL IL cosθboth a & b√3 VL IL cosθ30sEditDelete
- Q13What types of the figures show 3 phase transformer, Name it?Step up TRANSFORMERthree single- phase transformersStep down TRANSFORMERSINGLE 3-PHASE TRANSFORMER30sEditDelete
- Q14Which type of transformer shown in the figure ?three single- phase transformersStep up TRANSFORMERSINGLE 3-PHASE TRANSFORMERStep down TRANSFORMER30sEditDelete
- Q15the main advantage of three single phase transformer isMORE EFFICIENTevery unit in the bank could be replaced individuallySMALLERCHEAPER30sEditDelete
- Q16The advantages of using single three phase transformer isAllSMALLERMORE EFFICIENCYCHEAPER30sEditDelete
- Q17Transformers can be connected together in .............seriesParallelAll the aboveCompound30sEditDelete
- Q18The efficiency of the transformer is inversely proportional to …………………..Transformer ratiothe electrical lossesNone of themThe phase angle30sEditDelete
- Q19Hysteresis losses and Eddy current losses it called………….Stray lossesCore lossesMechanical lossesCopper losses30sEditDelete
- Q20The Copper losses in transformer depends onType of coreAllThe resistances of coilsTime30sEditDelete
