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Power Systems - Interview Questions and Answers

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96. The percentage resistance and percentage reactance of a 10 kVA, 400 V/200 V, 3-phase transformer are 2% and 10% respectively. If the constant losses in the machine are 1 %, the maximum possible percentage efficiency of the transformer is
A. 98.32
B. 97.25
C. 96.85
D. 96.12
Explanation:
97. A synchronous generator connected to an infinite bUB delivers power at a lag p.r. If its excitation is increased
A. the terminal voltage increases
B. voltage angle 8 increases
C. current delivered increases
D. all of the above
Explanation:
98. If the reference bUB is changed in two load flow runs with same Bystena data and power obtained for reference bur taken a. specified P and Q in the latter run
A. the system losses will be unchanged but complex bus voltage will change
B. the system losses will be changed but complex bus voltages remain unchanged
C. the system losses as well be as complex bus voltage will change
D. the system losses as well be as complex bus voltage will unchange
Explanation:
99. A 100 kVA transformer has 4% impedance and 50 k VA transformer has 3% impedance when they are operated in parallel, which 6 transformer will reacb full load first
A. 3%
B. 4%
C. data is insufficient
D. none of the above
Explanation:
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