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Power Systems

Power Systems
Condition for maximum voltage regulation

 tanφ = X/R
 cosφ = R/X
 cosφ = X/R
 tanφ = R/X

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Power Systems
Transmission lines are transposed to reduce

 skin effect
 ferranti effect
 interference with neighbouring communication lines
 proximity effect

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Power Systems
For which one of the following types of motors, is the equal area criterion for stability applicable?

 DC shunt motor
 Three phase induction motor
 DC series motor
 Three phase synchronous motor

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Power Systems
Surge impedance loading can be increased by

 increasing of voltage level
 both 1 and 2
 increasing of capacitance value
 increasing of inductance value

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Power Systems
In transmission lines distribution constants are

 inductance and resistance
 resistance
 both 1 and 2
 inductance and capacitance

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Power Systems
Cheapest plant in operation and maintenance is

  nuclear.
  diesel power.
  steam power.
  hydroelectric.

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