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Power Systems

Power Systems
Which of the following is used in thermal plants

 Joule cycle
 Rankine cycle
All of these
 Otto cycle

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Power Systems
On which one of the following cycles does a modern steam power plant work?

 Carnot cycle
 Otto cycle
 Rankine cycle
 Bell-Coleman cycle

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Power Systems
Find the relation between sub transient (X"), transient (X') and synchronous reactance (X) ?

 X" < X' < X
 X" > X' >X
 X" > X' < X
 X" < X' > X

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Power Systems
A generator has reactances of sub transient (X")= 0.5 pu, transient (X') = 0.8 pu and synchronous reactance (X) = 5 pu. The voltages at these reactances are 1.2 V, 1.1 V and 1 V respectively. Find the corresponding sub transient fault current in pu?

 1.375 pu
 0.2 pu
 3.975 pu
 2.4 pu

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Power Systems
The specific speeds of Kaplan, Francis and Pelton turbines are in

 neither increasing nor decreasing order.
 the increasing order.
  the decreasing order.
None of these

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Power Systems
A transmission line has impedance of (0.005 + j0.05) pu. Find the line at which maximum value of negative DC off set current is produced, if it is applied with Vm cosωt?

 1.47 msec
 2.63 msec
 4.68 msec
 9.68

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