Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A.
Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current.
Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current.
The output voltage of each generator will be
A. 240 V.
B. 238.2 V.
C. 271.7 V.
D. 256.4 V.
Show Answer
Answer: D
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Mike
June 18, 2023, 4:19pm
2
To determine the output voltage of each generator, we can use the concept of voltage regulation. Voltage regulation is the percentage change in terminal voltage from no-load to full-load conditions, expressed as a percentage of the no-load voltage.
For Generator G1:
Voltage regulation = (Vno-load - Vfull-load) / Vno-load * 100%
= (280 - 240) / 280 * 100%
= 40 / 280 * 100%
= 14.29%
For Generator G2:
Voltage regulation = (Vno-load - Vfull-load) / Vno-load * 100%
= (300 - 240) / 300 * 100%
= 60 / 300 * 100%
= 20%
The output voltage of each generator can be calculated as follows:
Output voltage of G1 = Vno-load - (Voltage regulation of G1 * Vno-load)
= 280 - (14.29% * 280)
= 280 - (0.1429 * 280)
= 280 - 40
= 240 V
Output voltage of G2 = Vno-load - (Voltage regulation of G2 * Vno-load)
= 300 - (20% * 300)
= 300 - (0.2 * 300)
= 300 - 60
= 240 V
Therefore, the output voltage of each generator will be 240 V (option A).