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Power Systems

Power Systems
Specified quantities of slack bus are

 V and δ
 P and Q
 P and V
 P and δ

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Power Systems
A 100 Km long transmission line is loaded at 110 kV. If the loss of line is 5 MW and the load is 150 VA the resistance of the line is

 4.65 Ω / phase.
 2.26 Ω / phase.
  8.06 Ω / phase.
 6.06 Ω / phase.

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Power Systems
The steam power plant efficiency can be improved by

 using large quantity of water.
 burning large amount of coal.
  using high temperature and high pressure steam.
 decreasing the load on the plant.

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Power Systems
The power output from an hydroelectric plants depend on

 type of dam, type of catchment area and discharge.
 type of dam, head, system efficiency.
 type of turbine, type of dam and type of catchment area.
  discharge, system efficiency.

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Power Systems
Equal area criteria is used for

 nether 1 nor 2
 absolute stability of the system
 relative stability of the system
 either 1 or 2

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Power Systems
Maximum efficiency of modern coal fired steam raising thermal power plants is restricted to about 035 (a low value), mainly because of

 high energy loss in boiler.
 low steam turbine mechanical efficiency.
 low alternative efficiency.
  high energy loss from turbine exhaust to condenser.

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