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Power Systems

Power Systems
Condition for maximum voltage regulation

 tanφ = X/R
 cosφ = R/X
 tanφ = R/X
 cosφ = X/R

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Power Systems
What is the correct expression for the electrical power developed by

 75 × 0.736 × WQHη.
 ( 75 / 0.736 ) × WQHη.
 ( 7 / 75 ) × WQHη.
  ( 0.763 / 75 ) × WQHη.

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Power Systems
A cable has the following characteristics, L = 0.201 µH/m and C = 196.2 pF/m. The velocity of wave propagation through cable is

 159.24 m/µs
 32 m/s
 0.0312 m/s
 159.24 m/s

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

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

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Power Systems
Plug setting of a relay can be altered by varying

 none of these.
 no. of ampere-turns.
 air gap of magnetic path.
 adjustable back up stop.

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Power Systems
The corona loss on a particular system at 60 Hz is 1 kW/km per phase. What is the corona loss at 50 Hz in kW/km per phase?

 0.882
 1
 1.13
 0.93

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