Virtual Labs

a: Armature control method b: Field control method c: Combination of armature control method and field control method d: Totally different from armature and field control method

In Ward Leonard speed control method for lowering the speed of the motor ________.

a: Reduce armature voltage b: Increase armature voltage c: Increase field current d: Decrease field current

Reducing the field current will give us _______.

a: Constant torque and variable power speed control b: Constant torque speed control c: Variable power speed control d: Constant power speed control

Speed control by Ward Leonard method, can give uniform speed variation _______.

a: In both directions b: In one direction c: Below normal speed only d: Above normal speed only

Efficiency of Ward Leonard method is?

a: Higher than rheostatic control method but lower than shunt field control method b: Lower than rheostatic control method c: Higher than rheostatic control method and shunt field control method d: Depends on load

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