DC Motors – Exercise – 1

DC Motors » Exercise – 1

1. The direction of rotation of a D.C. series motor can be changed by :

(a) interchanging supply terminals
(b) interchanging field terminals
(c) either of (a) and (b) above
(d) None of the above

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

(a) Series motor
(b) Shunt motor
(c) Differentially compound motor
(d) Cumulative compound motor

3. Which D.C. motor will be preferred for machine tools ?

(a) Series motor
(b) Shunt motor
(c) Cumulative compound motor
(d) Differential compound motor

4. Differentially compound D.C. motors can find applications requiring :

(a) high starting torque
(b) low starting torque
(c) variable speed
(d) frequent on-off cycles

5. Which D.C. motor is preferred for elevators ?

(a) Shunt motor
(b) Series motor
(c) Differential compound motor
(d) Cumulative compound motor

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