DC Generators Objective Type Questions and Answers - ObjectiveBooks

DC Generators Objective Type Questions and Answers

Practice Test: Question Set - 11

1. The bearings used to support the rotor shafts are generally
    (A) Ball bearings
    (B) Bush bearings
    (C) Magnetic bearings
    (D) Needle bearings

2. The material for commutator brushes is generally
    (A) Mica
    (B) Copper
    (C) Cast iron
    (D) Carbon

3. Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator?
    (A) Dummy coils
    (B) Commutator
    (C) Eye bolt
    (D) Equalizer rings

4. The armature core of a D.C. generator is usually made of
    (A) Silicon steel
    (B) Copper
    (C) Nonferrous material
    (D) Cast-iron

5. Permeance is the reciprocal of
    (A) Flux density
    (B) Reluctance
    (C) Ampere turns
    (D) Resistance

6. A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly
    (A) 150 V
    (B) 175 V
    (C) 240 V
    (D) 290 V

7. A D.C. generator can be considered as
    (A) Rectifier
    (B) Prime mover
    (C) Rotating amplifier
    (D) Power pump

8. The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except
    (A) Armature reaction
    (B) Armature resistance drop
    (C) Field weakening due to armature reaction and armature
    (D) Commutation

9. Which of the following generating machine will offer constant voltage on all loads?
    (A) Self-excited generator
    (B) Separately excited generator
    (C) Level compounded generator
    (D) All of the above

10. If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by
    (A) Blv
    (B) Blv2
    (C) Bl2v
    (D) Bl2v2

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