No-load speed of which of the following motor will be highest ?

Related Mcqs:

1. The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is______________?

   A. 2.36%
   B. 4.76%
   C. 6.77%
   D. 8.84%

2. 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

3. The speed of a D.C. shunt motor is required to be more than full load speed. This is possible by______________?

   A. reducing the field current
   B. decreasing the armature current
   C. increasing the armature current
   D. increasing the excitation current
   E. none of the above methods

4. For the same H.P. rating and full load speed, following motor has poor starting torque_____________?

   A. shunt
   B. series
   C. differentially compounded
   D. cumulativelyc’ompounded

5. D.C. motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select this______________?

   A. series motor
   B. shunt motor
   C. compound motor
   D. any of the above

6. As -the load is increased the speed of D.C. shunt motor will____________?

   A. reduce slightly
   B. increase slightly
   C. increase proportionately
   D. remains unchanged

7. If the load on a DC shunt motor is increases, its speed is slightly reduced due to______________?

   A. increase in armature current
   B. increase in flux
   C. decrease in reactance
   D. decrease in back emf

8. 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

9. 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

10. One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven_______________?

    A. runs as a generator
    B. does not run as a generator
    C. also runs as a motor comes to stop after sometime