D.C. Motors Multiple Choice Questions

D.C. Motors

Question 1.

The condition for maximum efficiency for a D.C. generator is

A.

 Eddy current losses = stray losses

B.

 Hysteresis losses = eddy current losses

C.

 Copper losses = 0

D.

 Variable losses = constant losses

Explanation :

Explanation Not Provided

Question 2.

If a D.C. motor is connected across the A.C. supply it will

A.

 Run at normal speed

B.

 Not run

C.

 Run at lower speed

D.

 Burn due to heat produced in the field winding by eddy currents

Explanation :

Explanation Not Provided

Question 3.

The speed of a D.C. shunt motor can be increased by

A.

 Increasing the resistance in armature circuit

B.

 Increasing the resistance in field circuit

C.

 Reducing the resistance in the field circuit

D.

 Reducing the resistance in the armature circuit

Explanation :

Explanation Not Provided

Question 4.

The armature voltage control of D.C. motor provides

A.

 Constant torque drive

B.

 Constant voltage drive

C.

 Constant current drive

D.

 None of the above

Explanation :

Explanation Not Provided

Question 5.

Starters are used with D.C. motors because

A.

 These motors have high starting torque

B.

 These motors are not self-starting

C.

 Back e.m.f. of these motors is zero initially

D.

 To restrict armature current as there is no back e.m.f. while starting

Explanation :

Explanation Not Provided

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