2. A d.c. shunt generator gave the following open-circuit characteristic when driven at 750 r.p.m. Field current, A : 0.5 1 1.5 2 2.5 E.m.f., V 50 84 105 120 131 (i) If the machine is run as a shunt generator at 750 r.p.m., to what voltage will it excite with shunt field resistance equal to 70 2? (ii) What is the critical value of shunt field resistance? (iii) What is the critical speed when the shunt field resistance is 70 2? (iv) With shunt field resistance equal to 55 , what reduction in speed be made to make the open-circuit voltage equal to 100 V?
2. A d.c. shunt generator gave the following open-circuit characteristic when driven at 750 r.p.m. Field current, A : 0.5 1 1.5 2 2.5 E.m.f., V 50 84 105 120 131 (i) If the machine is run as a shunt generator at 750 r.p.m., to what voltage will it excite with shunt field resistance equal to 70 2? (ii) What is the critical value of shunt field resistance? (iii) What is the critical speed when the shunt field resistance is 70 2? (iv) With shunt field resistance equal to 55 , what reduction in speed be made to make the open-circuit voltage equal to 100 V?
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Transcribed Image Text:2. A d.c. shunt generator gave the following open-circuit characteristic
when driven at 750 r.p.m.
Field current, A:
0.5
1
1.5
2
2.5
E.m.f., V
:
50
84
105
120
131
(i) If the machine is run as a shunt generator at 750 r.p.m., to what
voltage will it excite with shunt field resistance equal to 70 N?
(ii) What is the critical value of shunt field resistance?
(iii) What is the critical speed when the shunt field resistance is 70 2?
(iv) With shunt field resistance equal to 55 2, what reduction in speed be
made to make the open-circuit voltage equal to 100 V?
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