The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected?

Power Systems
The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected?

85%

88.2%

11.8%

15%

85%

88.2%

11.8%

15%

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Power Systems
The average thermal efficiency of a modern nuclear power plant is about

40 %.

60 %.

80 %.

30 %.

40 %.

60 %.

80 %.

30 %.

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Power Systems
The sequence components of the fault current are as follows: IR1 = j1.5 pu, IR2 = -j0.5 pu, IR0 = -j1. The type of fault is

LLL

LL

LG

LLG

LLL

LL

LG

LLG

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Power Systems
When bundle conductor are used in place of single conductor the effective inductance and capacitance will respectively

decrease and remain unaffected.

decrease and increase.

increase and remain unaffected.

increase and decrease.

decrease and remain unaffected.

decrease and increase.

increase and remain unaffected.

increase and decrease.

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Power Systems
Which of the following statements is/are true? The elements of each row of a Y bus matrix for load flow studies in power system add up to zero

always

if the shunt admittances at the buses are ignored

if both 2 and 3 are satisfied

if the mutual couplings between transmission lines are absent

always

if the shunt admittances at the buses are ignored

if both 2 and 3 are satisfied

if the mutual couplings between transmission lines are absent

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Power Systems
The function of draft tube is reaction turbine is to

reduce water hammer.

increase flow rate of water.

convert kinetic energy of water.

all of above.

reduce water hammer.

increase flow rate of water.

convert kinetic energy of water.

all of above.

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Power Systems

Power Systems The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected?

Power Systems The average thermal efficiency of a modern nuclear power plant is about

Power Systems The sequence components of the fault current are as follows: IR1 = j1.5 pu, IR2 = -j0.5 pu, IR0 = -j1. The type of fault is

Power Systems When bundle conductor are used in place of single conductor the effective inductance and capacitance will respectively

Power Systems Which of the following statements is/are true? The elements of each row of a Y bus matrix for load flow studies in power system add up to zero

Power Systems The function of draft tube is reaction turbine is to

Power Systems
The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected?

Power Systems
The average thermal efficiency of a modern nuclear power plant is about

Power Systems
The sequence components of the fault current are as follows: IR1 = j1.5 pu, IR2 = -j0.5 pu, IR0 = -j1. The type of fault is

Power Systems
When bundle conductor are used in place of single conductor the effective inductance and capacitance will respectively

Power Systems
Which of the following statements is/are true? The elements of each row of a Y bus matrix for load flow studies in power system add up to zero

Power Systems
The function of draft tube is reaction turbine is to