Multiple Choice Questions with Answers on DC Generators - Set 08 - ObjectiveBooks

Multiple Choice Questions with Answers on DC Generators - Set 08

Practice Test: Question Set - 08

1. Armature reaction in a generator results in
    (A) Demagnetization of leading pole tip and magnetization of trailing pole tip
    (B) Demagnetization of trailing pole tip and magnetization of leading pole tip
    (C) Demagnetizing the center of all poles
    (D) Magnetizing the center of all poles

2. The essential condition for parallel operation of two D.C. generators is that they have
    (A) Same kW rating
    (B) The same operation r.p.m.
    (C) The same drooping voltage characteristics
    (D) Same percentage regulation

3. The commutator segments are connected to the armature conductors by means of
    (A) Copper lugs
    (B) Resistance wires
    (C) Insulation pads
    (D) Brazing

4. Copper brushes in D.C. machine are used
    (A) Where low voltage and high currents are involved
    (B) Where high voltage and small currents are involved
    (C) In both of the above cases
    (D) In none of the above cases

5. Armature reaction of an unsaturated D.C. machine is
    (A) Cross-magnetizing
    (B) Demagnetizing
    (C) Magnetizing
    (D) None of above

6. In D.C. generators, lap winding is used for
    (A) High voltage, high current
    (B) Low voltage, high current
    (C) High voltage, low current
    (D) Low voltage, low current

7. If a D.C. generator fails to build up the probable cause could not be
    (A) Imperfect brush contact
    (B) Field resistance less than the critical resistance
    (C) No residual magnetism in the generator
    (D) Faulty shunt connections tending to reduce the residual magnetism

8. An exciter for a turbo generator is a
    (A) Separately excited generator
    (B) Shunt generator
    (C) Series generator
    (D) Compound generator

9. The critical resistance of the D.C. generator is the resistance of
    (A) Field
    (B) Brushes
    (C) Armature
    (D) Load

10. 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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