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Electrical Engineering Objective Questions { DC Motors }

386.  In case of D.C. generators, the armature voltage control is considered as suitable if the machine is driven
A. at constant load
B. at constant current
C. at constant torque
D. at constant VA
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387.  With a D.C. generator which of the following regulation is preferred?
A. 100% regulation
B. infinite regulation
C. 50% regulation
D. 1% regulation
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388. Two generators A and B running in parallel are supplying power to a common load of 500 kW. Generator A has armature resistance equal to half that of B. Which of the following statements is correct?
A. Both generators will share load equally
B. Generator A will take load less than the load taken by generator B
C. Generator B will take more load as compared to generated A
D. None of the above
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389. As a result of armature reaction, the reduction in the total mutual air gap flux in a D.C. generator is approximately
A. 40 percent
B. 25 percent
C. 10 percent
D. 5 percent
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390. Shunt generators are most suited for stable parallel operation because of their
A. rising voltage characteristics
B. identical voltage characteristics
C. drooping voltage characteristics
D. linear voltage characteristics
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