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DC Motors

DC Motors
In the dc motor the iron losses occur in

Brushes
Commutator
Field
Armature

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DC Motors
If a dc motor is to be selected for conveyors, which motor would be preferred?

Differentially compound motor
Shunt motor
Cummulative compound motor
Series motor

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DC Motors
The starting resistance of a DC motor is generally

Around 500 Ω
Infinitely large
1000 Ω
Low

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DC Motors
When the speed of dc motor increases, its armature current

Decreases
None of the listed here
Increases
Remains same

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DC Motors
The main disadvantage of the Ward-Leonard control method is

High maintenance cost
High initial cost
All of these
Low efficiency at high loads

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DC Motors
In D.C. motor which of the following can sustain the maximum temperature rise?

Armature winding
Field winding
Slip rings
Commutator

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