By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?

A. Frame
B. Shaft
C. Commutator
D. Stator

These days D.C. motors are widely used in____________?

A. Pumping sets
B. Air compressors
C. Electric traction
D. Machine shops

In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be_____________?

A. Almost negligible
B. Rated full-load current
C. Less than full-load current
D. More than full-load current

In case of D.C. shunt motors the speed is dependent on back e.m.f. only because____________?

A. Back e.m.f. is equal to armature drop
B. Armature drop is negligible
C. Flux is proportional to armature current
D. Flux is practically constant in d:c. shunt motors

What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?

A. The motor will stop
B. The motor will continue to run
C. The armature may burn
D. The motor will run nosiy

A direct on line starter is used: for starting motors___________?

A. Up to 5 h.p
B. Up to 10 h.p
C. Up to 15 h.p
D. Up to 20 h.p

In a D.C. shunt motor, speed is______________?

A. Independent of armature current
B. Directly proportional to the armature current
C. Proportional to the square of the current
D. Inversely proportional to the armature current

The speed of a D.C. shunt motor more than its full-load speed can be obtained by_____________?

A. Decreasing the field current
B. Increasing the field current
C. Decreasing the armature current
D. Increasing the armature current

When two D.C. series motors are connected in parallel, the resultant speed is____________?

A. More than the normal speed
B. Loss than the normal speed
C. Normal speed
D. Zero

To get the speed of D.C, motor below the normal without wastage of electrical energy is used?

A. Ward leonard control
B. Rheostatic control
C. Any of the above method
D. None of the above method