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Power Systems

Power Systems
For n bus power system size of Y bus matrix is

 (n-2)×(n-2)
 n×n
 (n-1)×(n-1)
 (n-1)×(n-2)

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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 boilers
 low steam turbine mechanical efficiency
 high energy loss in condenser

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Power Systems
Which of the following is low specific speed turbine?

 Pelton
None of these
 Kaplan
 Francis

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Power Systems
A 3 - Φ, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 s. The symmetrical breaking current is

 1200 A.
 3600 A.
 104.8 kA.
  35 kA.

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Power Systems
Under excited Synchronous phase modifier works as

 any of the above
 shunt capacitor
 shunt reactor
 series capacitor

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Power Systems
Oxide film arrestor has which of the following properties?

 Installed at points of transmission line where daily visit is difficult.
 Does not require daily charging.
 It is expensive.
 Both A and B.

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