A fault occurring at the terminals of an unloaded synchronous generator operating at its rated voltage has resulted in the following values of currents and voltages. IR0 = j 2.37 pu IR1 = -j 3.05 pu IR2 = j 0.68 pu VR0 = VR1 = VR2 = 0.237 pu. Which of the following faults has occurred?

Power Systems
A fault occurring at the terminals of an unloaded synchronous generator operating at its rated voltage has resulted in the following values of currents and voltages. IR0 = j 2.37 pu IR1 = -j 3.05 pu IR2 = j 0.68 pu VR0 = VR1 = VR2 = 0.237 pu. Which of the following faults has occurred?

LLL

LL

LG

LLG

LLL

LL

LG

LLG

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Power Systems
The power level of nuclear reactor can be increase by ( K = multiplication factor )

lowering the value of K below and keeping at that lowered value.

raising the value of K above 1, but later bringing it back to K = 1.

lowering the value of K below 1 but later bringing it back to K = 1.

raising the value of K above 1 and keeping it at raised value.

lowering the value of K below and keeping at that lowered value.

raising the value of K above 1, but later bringing it back to K = 1.

lowering the value of K below 1 but later bringing it back to K = 1.

raising the value of K above 1 and keeping it at raised value.

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Power Systems
Which of the following is an impulse turbine

Pelton turbine.

Francis turbine.

Kaplan turbine.

None of above.

Pelton turbine.

Francis turbine.

Kaplan turbine.

None of above.

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Power Systems
An unloaded generator with a pre-fault voltage 1 pu has the following sequence impedance: Z0 = j 0.15 pu, Z1 = Z2 = j 0.25 pu The neutral is grounded with a reactance of 0.05 pu. The fault current in pu for single line to ground fault is

3.75 pu

2.5 pu

4.28 pu

7.25 pu

3.75 pu

2.5 pu

4.28 pu

7.25 pu

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Power Systems
A penstock is used as a condition between

none of above.

the turbine and discharge drain.

the heat ex-changer and the turbine in nuclear power plant.

the dam and the turbine in a hydro station.

none of above.

the turbine and discharge drain.

the heat ex-changer and the turbine in nuclear power plant.

the dam and the turbine in a hydro station.

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Power Systems
A diesel power plant is generally used as a/an

Standby/emergency plant.

Base load.

Peak loads.

Any of above.

Standby/emergency plant.

Base load.

Peak loads.

Any of above.

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Power Systems

Power Systems The power level of nuclear reactor can be increase by ( K = multiplication factor )

Power Systems Which of the following is an impulse turbine

Power Systems An unloaded generator with a pre-fault voltage 1 pu has the following sequence impedance: Z0 = j 0.15 pu, Z1 = Z2 = j 0.25 pu The neutral is grounded with a reactance of 0.05 pu. The fault current in pu for single line to ground fault is

Power Systems A penstock is used as a condition between

Power Systems A diesel power plant is generally used as a/an

Power Systems
The power level of nuclear reactor can be increase by ( K = multiplication factor )

Power Systems
Which of the following is an impulse turbine

Power Systems
An unloaded generator with a pre-fault voltage 1 pu has the following sequence impedance: Z0 = j 0.15 pu, Z1 = Z2 = j 0.25 pu The neutral is grounded with a reactance of 0.05 pu. The fault current in pu for single line to ground fault is

Power Systems
A penstock is used as a condition between

Power Systems
A diesel power plant is generally used as a/an