DC Generators Objective Questions with Answers - Set 09 - ObjectiveBooks

DC Generators Objective Questions with Answers - Set 09

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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