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DC Generators

DC Generators
The current in armature conductors of a dc machine is ______

Pure dc
Pure dc plus pulsating dc
Ac
Pulsating dc

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DC Generators
If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to

increase the field resistance
increase the speed of primemover
check armature insulation resistance
reverse the field connections

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DC Generators
In a short shunt compound wound generator, the shunt field is connected in parallel with

Armature
Series field
Parallel combination of armature and series field
Series combination of armature and series field

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DC Generators
The resistance of armature winding depends on

Number of conductors
All of the listed here
Length of conductor
Cross sectional area of the conductor

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DC Generators
The commutator pitch for simplex lap winding is equal to

Numbers of poles in the machine
1
None of the listed here
Number of pairs of poles

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DC Generators
Magnetic field in a D.C. generator is produced by

None of these
Permanent magnets
Electromagnets
Both (A) and (B)

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