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MCQ of D.C generators page-2

11. In the commutation process in a dc machine, which of the following quantity reverses?

a) Both voltage and current
b) The voltage
c) The current
d) None of these

Ans: (c)

12. A conductor is rotating within a magnetic field. At which of the following positions do the zero voltages occur?

a) At right angles to the axis of the magnetic field
b) Along the axis of the magnetic field
c) At 45° with the axis of the magnetic field
d) None of these

Ans: (b)

13. Increase in the number of commutator segments of dc machine results in

a) Decrease in the total output power
b) Increase in the total output power
c) Smoothening of the shape of output dc wave
d) Increase in the magnitude of output voltage

Ans: (c)

14. In a dc machine, the laminated parts are the armature core and

a) Pole shoes
b) Yoke
c) Shaft
d) base

Ans: (a)

15. The commutator in dc machine works as

a) mechanical rectifier
b) mechanical inverter
c) energy converter
d) either (a) or (b)

Ans: (a)

16. Which of the following forms an energy converter ?

a) magnetor-striction effect
b) piezo-electric effect
c) hall effect
d) all of these

Ans: (d)

17. Each commutator segment is connected to the armature conductor by means of

a) resistance wire
b) carbon brush
c) insulator
d) copper lug

Ans: (d)

18.Brushes for commutator are made of

a) carbon
b) copper
c) aluminium
d) synthetic rubber

Ans: (a)

19. In a dc generator, brushes are always placed

a) along bisector of GNA and MNA
b) along magnetic neutral axis (MNA)
c) along geometrical neutral axis (GNA)
d) arbitrarily
Ans: (b)

20. In dc generators, brushes remain in contact with the conductors which lie

a) under south pole
b) under north pole
c) arbitrarily
d) in the interpolar region

Ans: (d)

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