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Power Systems

Power Systems
The angular moment of 10 MVA generator is 0.2. Find the new value of angular moment for 20 MVA base?

 0.25 pu
 0.2 pu
 0.1 pu
 0.4 pu

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Power Systems
A transmission line has a surge impedance of 400 Ω is connected with the cable having surge impedance of 40 Ω, a surge magnitude of 100 kV is travelling from the transmission line towards the cable. Find the transmitted voltage?

 100 kV
 36. 36 kV
 18.18 kV
 30.6 Kv

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Power Systems
What is the function of economiser in steam boilers

 collect ash particals
 cooling
 improving thermal efficiency
All of these

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Power Systems
Resistance switching in normally employed in

 all breakers.
 minimum oil breakers.
 bulk oil breakers.
  air blast circuit breaker.

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Power Systems
The fact that current density is higher at the surface when compared to centre is known as

All of these
 proximity effect
 skin effect
 carona

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Power Systems
A power system network has n nodes, Z33 of its bus impedance matrix is j0.5 pu. The voltage at node 3 is 1.3∠ -10°. If capacitor is having reactance of -j3.5 pu is now added to the network between node 3 and reference node, the current drawn by the capacitor in pu is

 0.725∠ 80°
 0.433∠ 80°
 0.371∠ -100°
 0.325∠ -100°

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