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Power Systems

Power Systems
The amount of ash content in Indian coal

  45 %.
 20 %.
  60 %.
 35 %.

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Power Systems
Length of the cable is doubled, its capacitance C will be

 unchanged.
 one-fourth.
 one-half.
 doubled.

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Power Systems
The maximum efficiency of modern coal fired steam steam raising thermal power plants is restricted to about 0.35( a low value), mainly because of

 high energy loss in boilers
 low steam turbine mechanical efficiency
 low alternator efficiency
 high energy loss in condenser

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Power Systems
The SWR on a lossless transmission line of the characteristic impedance 100 ohm is 3. The line is the terminated by

 A resistance of 100/3 ohm.
 A resistance of j300 ohm.
 A resistance of j100/3 ohm.
 A resistance of 100 ohm.

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Power Systems
The characteristic impedance of a transmission on line is

 Directly proportional to square root of its length.
 Inversely proportional to its length.
 Directly proportional to its length.
  Independent of its length.

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Power Systems
Objectives of power system is/are

 Cost of electrical energy per KWh is to be minimum
 both 1 and 2
 nether 1 nor 2
 Rated voltage and frequency has to be supplied to the consumers

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