Revesion 2
Quiz by Ali
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44 questions
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- Q1Three phase transformer has................. Terminal61210330s
- Q2The single phase transformer has ………………. Coil8121230s
- Q3The coil which connected to load in transformer Name ……………. Coil.primary coilcurrent coilsecondary coilvoltage coil30s
- Q4The coil which connected to power supply in Transformer name ………. CoilSecondary coil.Main coilPrimary coilExtra coil30s
- Q530s
- Q6The picture shows …………… connection of 3 phase transformerD / YY / YD / DY / D30s
- Q7the main parts of a synchronous generatorstator framestator corerotorAll30s
- Q8The correct tool to be used to replace the bearing of a motor isPliersBearing PullerScrew DriverHammer and chisel30s
- Q9Find the number of poles required on the rotor of generator whose output frequency is 50 HZ if ns=3000 R.P.M______2 HZ4pole2 pole6pole120s
- Q10At what speed must be rotor of generator rotate to generate 50 HZ power in a four pole machine _____N=1800 R.P.MN= 3000 R.P.MN= 1500 R.P.MN= 15OO HZ120s
- Q11the figure refers to________full load characteristicflow power diagramopen circuit characteristicnon of them120s
- Q12The purpose of excitation …………..to use high speedto give the energyall of theTo provide the field current for magnetizing the machine120s
- Q13The relationship between speed, frequency and number of poles.f=(N*P)/120f=Ns-NrF=1/TAll of them30s
- Q14The formula for voltage regulation is.......=[(VnL-VfL)/VfL]*100=VnL/VfL=[(VfL-VnL)/VfL]*100=[(VnL-VfL)/VnL]*10045s
- Q15Three-phase induction motor is_________a machine, which convert the heating energy into mechanical energy.all the abovea machine, which convert the mechanical energy into electrical energy.a machine, which convert the electrical energy into mechanical energy.45s