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POWER SYSTEMS

Power Systems
Two identical synchronous machines having same inertia constant are connected in parallel and swinging together. The effective inertia constant is 4 MJ/MVA. Then each machine has inertia constant of

 8 MJ/MVA
 2 MJ/MVA
 16 MJ/MVA
 4 MJ/MVA

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Power Systems
Maximum power capacity of a transmission line can be increased by

 nether 1 nor 2
 increasing voltage level
 either 1 or 2
 decreasing reactance value

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Power Systems
Which of the following is/are the disadvantages of phase modifiers?

 It consumes both active and reactive power
All of these
 It requires more maintenance because of running equipment
 Initial cost of synchronous phase modifier is higher

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Power Systems
In thermal power stations, economiser will

 reduce the heat
 both 2 and 3
 reduce the thermal efficiency
 increase the thermal efficiency

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Power Systems
Stock bridge dampers are used in case hill areas to over come the which problem?

 unequal ice loading
 increase string efficiency
All of these
 increase power factor

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