D.C. Generators

A. only if the load current is zero
B. only if the load current is not zero
C. irrespective of the value of load current
D. none of the above

A. Lenz’s law
B. Ohm’s law
C. Faraday’s law of electromagnetic induction
D. none of the above

A. will be less than 250 V
B. will always be 250 V
C. may be greater or less than 250 V
D. none of the above

A. 150 V
B. less than 150 V
C. greater than 150 V
D. none of the above

A. only if the resistance of the field circuit is less than critical value
B. only if the resistance of the field circuit is greater than critical value
C. irrespective of the value of the resistance in the field circuit
D. none

A. 100% regulation
B. infinite regulation
C. 50% regulation
D. 1% regulation

A. 270 V
B. 267.5 V
C. 265 V
D. 257.4 V

A. same kW rating
B. the same operation r.p.m.
C. the same drooping voltage characteristics
D. same percentage regulation

A. to increase the series flux
B. to increase the generated e.m.f.
C. to reduce the combined effect of ar-mature reaction of both the machines
D. so that the two identical machines will pass approximately equal cur¬rents to the load

A. The direction of that generator is reversed
B. The speed of that generator is increased
C. The field of that generator is weakened
D. That generator takes large share of loads