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DC Motors

DC Motors
The starting resistance of a DC motor is generally

Low
1000 Ω
Around 500 Ω
Infinitely large

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DC Motors
D.C. generators are normally designed for maximum efficiency around

Rated voltage
Full load
Rated r.p.m.
All of these

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DC Motors
The dirction of rotation of a dc series motor can be changed by

Either of Interchanging field or Interchanging supply
Interchanging supply terminals
None of the listed here
Interchanging field terminals

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DC Motors
If a D.C. motor is to be selected for conveyors, which rriotor would be preferred ?

Shunt motor
Series motor
Differentially compound motor
Cumulative compound motor

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DC Motors
The armature torque of the D.C. shunt motor is proportional to

None of these
field flux only
both (A) and (B)
armature current only

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DC Motors
In a dc machines the residual magnetism is of the order of

10 to 15 percent
50 to 75 percent
20 to 25 percent
2 to 3 percent

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