Question

A DC generator is operating at 1200 [RPM). With an externally applied shunt field current of 0.8 (A); the unloaded generator output voltage is 245 [V]. a. Draw the system diagram on the bottom of this page. b. What will the output voltage be if the prime mover speed is increased by 15%? c. What will happen to the output voltage if the field current is reduced to 0.5 (A) while maintaining 1200 [RPM]? d. What will happen to the output voltage if a load is applied which draws 2 [A] while maintaining the field current at 0.8 [A] and speed at 1200 [RPM]? Answers: 3.b. 3.c. 3.d. a. Drawing here (use a straight edge): 2.4. 393.9 (A) 3.c. $V_{out}$ will decrease.

          A DC generator is operating at 1200 [RPM). With an externally applied shunt field current of
0.8 (A); the unloaded generator output voltage is 245 [V].
a. Draw the system diagram on the bottom of this page.
b. What will the output voltage be if the prime mover speed is increased by 15%? 
c. What will happen to the output voltage if the field current is reduced to 0.5 (A) while
maintaining 1200 [RPM]? 
d. What will happen to the output voltage if a load is applied which draws 2 [A] while
maintaining the field current at 0.8 [A] and speed at 1200 [RPM]? 
Answers:
3.b.
3.c.
3.d.
a. Drawing here (use a straight edge):
2.4. 393.9 (A)
3.c. $V_{out}$ will decrease.

A DC generator is operating at 1200 [RPM). With an externally applied shunt field current of
0.8 (A); the unloaded generator output voltage is 245 [V].
a. Draw the system diagram on the bottom of this page.
b. What will the output voltage be if the prime mover speed is increased by 15%?
c. What will happen to the output voltage if the field current is reduced to 0.5 (A) while
maintaining 1200 [RPM]?
d. What will happen to the output voltage if a load is applied which draws 2 [A] while
maintaining the field current at 0.8 [A] and speed at 1200 [RPM]?
Answers:
3.b.
3.c.
3.d.
a. Drawing here (use a straight edge):
2.4. 393.9 (A)
3.c. Vout will decrease.

Added by Vanesa L.

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