Related Mcqs:

1. In a differentially compounded D.C. motor, if shunt field suddenly opens____________?

   A. the motor will first stop and then run in opposite direction as series motor
   B. the motor will work as series motor and run at slow speed in the same direction
   C. the motor will work as series motor and run at high speed in the same direction
   D. the motor will not work and come to stop

2. Why are the D.C. motors preferred for traction applications ?

   A. Torque and speed are inversely proportional to armature current
   B. Torque is proportional to armature current
   C. Torque is proportional to square root of armature current
   D. The speed is inversely proportional to the torque and the torque is proportional to square of armature current

3. Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be_____________?

   A. level compounded
   B. under compounded
   C. cumulatively compounded
   D. differentially compounded

4. In which of the following applications D.C. series motor is invariably tried?

   A. Starter for a car
   B. Drive for a water pump
   C. Fan motor
   D. Motor operation in A.C. or D.C

5. For which of the following applications a D.C. motor is preferred over an A.C. motor ?

   A. Low speed operation
   B. High speed operation
   C. Variable speed operation
   D. Fixed speed operation

6. 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

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

   A. pumping sets
   B. air compressors
   C. electric traction
   D. machine shops

8. In case of conductively compensated D.C. series motors, the compensating winding is provided______________?

   A. as separately wound unit
   B. in parallel with armature winding
   C. in series with armature winding
   D. in parallel with field winding

9. Which of the following motors one will choose to drive the rotary compressor ?

   A. D.C. shunt motor
   B. D.C. series motor
   C. Universal motor
   D. Synchronous motor

10. Which of the following motors is most suitable for signalling devices and many kinds of timers ?

    A. D.C. shunt motor
    B. D.C. series motor
    C. Induction motor
    D. Reluctance motor