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DC MOTORS

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

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

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DC Motors
D.C. series motors are used

Where constant operating speed is needed
Where load changes frequently
Where load is constant
None of these

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DC Motors
Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors?

Low cost
High starting torque
Wide speed range
Stability

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DC Motors
Three point starter can be used for

Shunt motor only
Compound motor only
Series motor only
Both shunt and compound motor

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DC Motors
In D.C. shunt motors as load is reduced

The speed will remain almost/constant
The speed will increase abruptly
The speed will reduce
The speed will increase in proportion to reduction in load

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