A generator has reactances of sub transient (X")= 0.5 pu, transient (X') = 0.8 pu and synchronous reactance (X) = 5 pu. The voltages at these reactances are 1.2 V, 1.1 V and 1 V respectively. Find the corresponding sub transient fault current in pu?

Power Systems
A generator has reactances of sub transient (X")= 0.5 pu, transient (X') = 0.8 pu and synchronous reactance (X) = 5 pu. The voltages at these reactances are 1.2 V, 1.1 V and 1 V respectively. Find the corresponding sub transient fault current in pu?

3.975 pu

1.375 pu

0.2 pu

2.4 pu

3.975 pu

1.375 pu

0.2 pu

2.4 pu

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Power Systems
The main objectives of electrical power transmission is/are

nether 1 nor 2

both 1 and 2

Transmission system must be more efficient with minimum line losses

Voltage regulation of the transmission line must be zero or minimum

nether 1 nor 2

both 1 and 2

Transmission system must be more efficient with minimum line losses

Voltage regulation of the transmission line must be zero or minimum

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Power Systems
An impulse turbine

always operates submerged.

makes use of a draft tube.

is most suited for low head and high discharge power plants.

operates by initial complete conversion to kinetic energy.

always operates submerged.

makes use of a draft tube.

is most suited for low head and high discharge power plants.

operates by initial complete conversion to kinetic energy.

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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
Which of the following will take least time in starting from cold condition to full load operation

Hydro electric power plant.

Thermal power plant.

Nuclear power plant.

Gas turbine plant.

Hydro electric power plant.

Thermal power plant.

Nuclear power plant.

Gas turbine plant.

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Power Systems
Which of the following statements is/are true? Due to corona,

charging current increases

interference increases

power loss increases

All of these

charging current increases

interference increases

power loss increases

All of these

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Power Systems

Power Systems A generator has reactances of sub transient (X")= 0.5 pu, transient (X') = 0.8 pu and synchronous reactance (X) = 5 pu. The voltages at these reactances are 1.2 V, 1.1 V and 1 V respectively. Find the corresponding sub transient fault current in pu?

Power Systems The main objectives of electrical power transmission is/are

Power Systems 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 Which of the following will take least time in starting from cold condition to full load operation

Power Systems Which of the following statements is/are true? Due to corona,

Power Systems
A generator has reactances of sub transient (X")= 0.5 pu, transient (X') = 0.8 pu and synchronous reactance (X) = 5 pu. The voltages at these reactances are 1.2 V, 1.1 V and 1 V respectively. Find the corresponding sub transient fault current in pu?

Power Systems
The main objectives of electrical power transmission is/are

Power Systems
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
Which of the following will take least time in starting from cold condition to full load operation

Power Systems
Which of the following statements is/are true? Due to corona,