Which D.C. motor is preferred for elevators ?

Related Mcqs:

1. 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...

2. 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...

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. 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...

5. Which method of braking is generally used in elevators ?

   A. Plugging B. Regenerative braking C. Rheostatic braking D. None of the above...

6. If a D.C. motor is to be selected for conveyors, which rriotor would be preferred ?

   A. Series motor B. Shunt motor C. Differentially compound motor D. Cumulative compound motor...

7. Which D.C. motor will be preferred for machine tools ?

   A. Series motor B. Shunt motor C. Cumulative compound motor D. Differential compound motor...

8. Which of the following motor is preferred for operation in highly explosive atmosphere ?

   A. Series motor B. Shunt motor C. Air motor D. Battery operated motor...

9. Which D.C. motor is generally preferred for cranes and hoists ?

   A. Series motor B. Shunt motor C. Cumulatively compounded motor D. Differentially compounded motor...

10. 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%...