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Power Systems

Power Systems
The amount of ash content in Indian coal

  45 %.
 20 %.
 35 %.
  60 %.

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Power Systems
For symmetrical network, the neutral current is

 infinity
 zero
 maximum
 any of the above

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Power Systems
A sort line with R/X ratio 1, the zero regulation is obtained when the power factor of the load is

 0 leading
 0.5
 unity
 0.707 leading

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Power Systems
The positive, negative and zero sequence per unit impedance of two generators connected in parallel are X1 = 0.12 pu, X2 = 0.096 pu and X0 = 0.036 pu. For LG fault at generator terminals (with 1 pu voltage) the positive sequence current will be

 10.936 pu
 9.936 pu
 8.936 pu
 7.936 pu

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Power Systems
A 50 Hz, 17.32 kV generator is connected to a power system. The system reactance and capacitance per phase are 10 mH and 0.2 mF respectively. What is the maximum voltage across the contacts of the circuit breaker at an instant when it passes through zero?

 28.28 kV
 30.28 kV
 31.28 kV
 29.28 kV

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Power Systems
The total number of strands in a ACSR conductor are 7, then find the layer number?

 5
 7
 2
 3

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