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Power Systems

Power Systems
Pipes carrying steam are generally of

 cast iron.
  steel.
 aluminium.
 cobalt.

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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

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

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Power Systems
Bundled conductors are used for EHV transmission lines primarily for reducing the

 copper loss
 surge impedance of the line
 voltage drop across the line
 corona loss

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Power Systems
The essential requirement(s) for power plants to be operated as peak load plants are

 Quick response to load variation.
All of these
 Capability of quick starts.
 Low capital cost.

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Power Systems
The specific speed of water turbine is the speed at which the turbine develops

 a minimum horse power.
 maximum horse power.
  unit horse power at unit head.
 unit horse power at all heads.

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Power Systems
A 100 MVA alternator operating at full load at 50 Hz. H = 4 MWsec/MVA, Td = 0.5 sec. One of the transmission line is tripped. So that output of generator is reduced to 70 MW. Find the frequency deviation during this time?

 0.92
 0.56
 -0.92
 -0.56

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