DC Generators - Interview Questions | Exam2Win

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6. A shunt generator can self-excite

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 resis-tance in the field circuit

D. only if the resistance of the field circuit is less than critical value

Explanation:

7. A series generator can self-excite

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

Explanation:

8. In a D.C. generator the critical resistance can be increased by

A. increasing its field resistance

B. decreasing its field resistance

C. increasing its speed

D. decreasing its speed

Explanation:

9. The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is

A. 2

B. 4

C. 6

D. 8

Explanation:

10. The main factor which leads to unstable parallel operation of flat and over compounded generators is

A. their rising voltage characteristics

B. unequal number of turns in their series field windings

C. unequal speed regulation of their primemovers

D. unequal series field resistances

Explanation: