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?

LL

LLL

LLG

LG

LL

LLL

LLG

LG

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Power Systems
For n bus power system size of Y bus matrix is

(n-1)×(n-1)

(n-1)×(n-2)

(n-2)×(n-2)

n×n

(n-1)×(n-1)

(n-1)×(n-2)

(n-2)×(n-2)

n×n

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Power Systems
The function of a surge tank is to

supply water at constant pressure.

relieve water hammer pressure in the penstock.

produce surge in the pipeline.

none of above.

supply water at constant pressure.

relieve water hammer pressure in the penstock.

produce surge in the pipeline.

none of above.

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Power Systems
Which one of the following relays has the capability of anticipating the possible major fault in a transformer?

Differential relay

Over current relay

Over fluxing relay

Buchholz relay

Differential relay

Over current relay

Over fluxing relay

Buchholz relay

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Power Systems
The inertia constant of 100 MVA, 50 Hz, 4 pole generator is 10 MJ/MVA. If the mechanical input to the machine is suddenly raised from 50 MW to 75 MW, the rotor acceleration will be equal to

125 electrical degrees/s²

22.5 electrical degrees/s²

225 electrical degrees/s²

12.5 electrical degrees/s²

125 electrical degrees/s²

22.5 electrical degrees/s²

225 electrical degrees/s²

12.5 electrical degrees/s²

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Power Systems
Condition for zero voltage regulation is

tanφ = X/R

cosφ = X/R

tanφ = R/X

cosφ = R/X

tanφ = X/R

cosφ = X/R

tanφ = R/X

cosφ = R/X

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Power Systems

Power Systems For n bus power system size of Y bus matrix is

Power Systems The function of a surge tank is to

Power Systems Which one of the following relays has the capability of anticipating the possible major fault in a transformer?

Power Systems The inertia constant of 100 MVA, 50 Hz, 4 pole generator is 10 MJ/MVA. If the mechanical input to the machine is suddenly raised from 50 MW to 75 MW, the rotor acceleration will be equal to

Power Systems Condition for zero voltage regulation is

Power Systems
For n bus power system size of Y bus matrix is

Power Systems
The function of a surge tank is to

Power Systems
Which one of the following relays has the capability of anticipating the possible major fault in a transformer?

Power Systems
The inertia constant of 100 MVA, 50 Hz, 4 pole generator is 10 MJ/MVA. If the mechanical input to the machine is suddenly raised from 50 MW to 75 MW, the rotor acceleration will be equal to

Power Systems
Condition for zero voltage regulation is