Practice Test: Question Set - 09
1. 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 resistance
in the field circuit
- (D) None of the above
2. In a commutator
- (A) Copper is harder than mica
- (B) Mica and copper are equally hard
- (C) Mica is harder than copper
- (D) None of the above
3. Iron losses in a D.C. machine are independent of variations in
- (A) Speed
- (B) Load
- (C) Voltage
- (D) Speed and voltage
4. Magnetic field in a D.C. generator is produced by
- (A) Electromagnets
- (B) Permanent magnets
- (C) Both (A) and (B)
- (D) None of the above
5. D.C. generator generally preferred for charging automobile batteries is
- (A) Series generator
- (B) Shunt generator
- (C) Long shunt compound generator
- (D) Any of the above
6. In case of a flat compounded generator
- (A) Voltage generated is less than the rated
voltage
- (B) Generated voltage is proportional to the load on
the generator
- (C) Voltage remains constant irrespective of the load
- (D) Speed varies in proportion to the load on the
generator
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
8. In case of D.C. machines, mechanical losses are primary function of
- (A) Current
- (B) Voltage
- (C) Speed
- (D) None of above
9. Equalizer rings are required in case armature is
- (A) Wave wound
- (B) Lap wound
- (C) Delta wound
- (D) Duplex wound
10. Following D.C. generator will be in a position to build up without any residual magnetism in the poles
- (A) Series generator
- (B) Shunt generator
- (C) Compound generator
- (D) Self-excited generator
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