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.
Answer: D
Share your understanding of this question with the correct explanation.
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).