Objective Test Paper on DC Generators- Set 03 - ObjectiveBooks

Objective Test Paper on DC Generators- Set 03

Practice Test: Question Set - 03

1. A separately excited generator as compared to a self-excited generator
    (A) Is amenable to better voltage control
    (B) Is more stable
    (C) Has exciting current independent of load current
    (D) Has all above features

2. In D.C. generators, the brushes on commutator remain in contact with conductors which
    (A) Lie under South Pole
    (B) Lie under North Pole
    (C) Lie under interpolar region
    (D) Are farthest from the poles

3. For a D.C. machines laboratory following type of D.C. supply will be suitable
    (A) Rotary converter
    (B) Mercury are rectifier
    (C) Induction motor D.C. generator set
    (D) Synchronous motor D.C. generator set

4. Compensating windings are used in D.C. generators
    (A) Mainly to reduce the eddy currents by providing local short-circuits
    (B) To provide path for the circulation of cooling air
    (C) To neutralize the cross-magnetizing effect of the armature reaction
    (D) None of the above

5. Open circuited armature coil of a D.C. machine is
    (A) Identified by the scarring of the commutator segment to which open circuited coil is connected
    (B) Indicated by a spark completely around the commutator
    (C) Both (A) and (B)
    (D) None of the above

6. Inter-pole flux should be sufficient to
    (A) Neutralize the commutating self induced e.m.f.
    (B) Neutralize the armature reaction flux
    (C) Neutralize both the armature reaction flux as well as commutating e.m.f. induced in the coil
    (D) Perform none of the above functions

7. In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when
    (A) There is no load on the generator
    (B) The generator runs on full load
    (C) The generator runs on overload
    (D) The generator runs on designed speed

8. In a D.C. generator the critical resistance refers to the resistance of
    (A) Brushes
    (B) Field
    (C) Armature
    (D) Load

9. Lap winding is composed of
    (A) Any even number of conductors
    (B) Any odd number of conductors
    (C) That even number which is exact multiple of poles + 2
    (D) That even number which is exact multiple of poles

10. In a D.C. generator
    (A) External resistance = internal characteristic armature reaction
    (B) Internal characteristic = magnetization characteristic ohmic drop
    (C) External characteristic = magnetization characteristic ohmic drop armature reaction
    (D) Magnetization characteristic = external characteristic

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