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DC Motors

DC Motors
The starting resistance of a DC motor is generally

Infinitely large
Around 500 Ω
Low
1000 Ω

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DC Motors
Compensating winding in a dc machine is placed

On yoke in the interpolar gap
None of the listed here
On yoke in the pole faces
On armature

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DC Motors
A series motor will over speed when

Load is removed
The armature circuit is opened.
The load is increase
The field is opened

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DC Motors
A dc motor can be easily identified by

Winding
Yoke
Commutator
Size of conductor

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DC Motors
Which D.C. motor is generally preferred for cranes and hoists?

Differentially compounded motor
Shunt motor
Cumulatively compounded motor
Series motor

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DC Motors
If a dc motor is comnected across the AC supply it will

Run at normal speed
Burn due to heat produced in the field winding by eddy currents
Run at lower speed
Not run

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