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Power Systems

Power Systems
At slack bus, which one of the following combinations of variables is not specified?

 Q and V
 P and Q
 P and V
 V and δ

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Power Systems
Which following statement are not true for line parameters R, L, G and C of transmission line

 G = 1/R where G is conductance of line.
 LC = μ ε and RG = σ ε.
 All of above.
 Both R and G depend on the conductivity of conductor forming the line.

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Power Systems
In a long transmission line, if we increase the length of the line, the parameters A and B respectively

 decreases and decreases
 decreases and increases
 increases and decreases
 increases and increases

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Power Systems
A load centre is at an equidistant from the two thermal generating stations G1 and G2. The fuel cost characteristics of the generating stations are given by F1 = a + bP1 + cP²1 F2 = a + b P2 + 2cP²2 Where P1 and P2 are the generation in MW of G1 and G2, respectively. For most economic generation to meet 300 MW of load, P1 and P2 respectively, are

 150, 150
 200, 100
 100, 200
 175, 125

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Power Systems
A steam power generation has an overall efficiency of 20 %. 0.6 Kg of coal is burnt per kWh of electrical energy generated. Calculated the calorific value of fuel

 7562 KCal / Kg.
  7166.67 KCal / Kg.
 7000 KCal / Kg.
 7268.45 KCal / Kg.

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Power Systems
Pump storage schemes are used to improve

 the load factor.
 the diversity factor.
  the plant capacity factor as well as the load factor of the power system.
 the power factor.

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