D.C. series motors are used______________?

Related Mcqs:

1. 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...

2. 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...

3. Which of the following tests will be suitable for testing two similar D.C. series motors of large capacity ?

   A. Swinburne’s test B. Hopkinson’s test C. Field test D. Brake test...

4. Differentially compound D.C. motors can find applications requiring___________?

   A. high starting torque B. low starting torque C. variable speed D. frequent on-off cycles...

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...

6. In D.C. shunt motors as load is reduced__________________?

   A. the speed will increase abruptly B. the speed will increase in proportion to reduction in load C. the speed will remain almost/constant D. the speed will reduce...

7. 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...

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

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

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...