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Power Systems

Power Systems
What should be the minimum depth (in metre)of cable trench to dug for laying of 1.1 kV?

 0.90.
 1.05.
  0.75.
 1.20.

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Power Systems
A generated station has a maximum demand of 30 MW, a load factor of 60% and a plant capacity factor of 50%. The reserve capacity of the plant is

 10 MW
 5 MW
 12 MW
 6 MW

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Power Systems
For symmetrical network, the neutral current is

 zero
 infinity
 maximum
 any of the above

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Power Systems
For harnessing low variable water heads, the suitable hydraulic turbine with reaction and adjustable vanes is

 Pelton.
 Francis.
 Impeller.
  Kaplan.

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Power Systems
The per unit impedance Z(pu) is given by

 ZΩ* (kVA)b/(KV)²b
 ZΩ* (MVA)b/(KV)²b
 ZΩ* (MVA)b/((KV)²b *100)
 ZΩ* (MVA)b*100/(KV)²b

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Power Systems
For transmission line which one of the following relation is true?

 AD - BC = 1
 AD - BC = -1
 AD - BC = 0
 AD + BC = 0

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