Electrical machines having a power output up to about 750 W may be called__________machines?

Related Mcqs:

1. Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as_____________?

   A. small size machines
   B. medium size machines
   C. large size machines
   D. any of the above

2. In D.C. machines, the ________ in field mmf results in increase in size and cost of machines?

   A. increase
   B. decrease
   C. either of the above
   D. none of the above

3. _______________is universally used for windings of electrical machines because it is easily workable without any possibility of fracture?

   A. Silver
   B. Steel
   C. Aluminium
   D. Copper

4. Machines cooled by direct cooling method may be called_____________?

   A. “supercharged”
   B. “inner cooled”
   C. “conductor cooled”
   D. any of the above

5. The design of mechanical parts is particularly important in case of __________ speed machines?

   A. low
   B. medium
   C. high
   D. any of the above

6. The action of electromagnetic machines can be related to which of the following basic principles __________?

   A. Induction
   B. Interaction
   C. Alignment
   D. All of the above

7. Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto_______________?

   A. 10 MW
   B. 30 MW
   C. 60 MW
   D. 150 MW

8. In D.C. machines the width of the duct is usually_____________?

   A. 4 mm
   B. 6 mm
   C. 8 mm
   D. 10 mm

9. In D.C. machines, ir order to prevent excessive distortion of field form by the armature reaction, the field mmf must be made____________?

   A. equal to that of armature mmf
   B. less in comparison with the armature mmf
   C. large in comparison with the armature mmf
   D. none of the above

10. In D.C. machines the usual limit of slot pitch is________________?

    A. between 5 to 10 mm
    B. between 10 to 15 mm
    C. between 15 to 20 mm
    D. between 25 to 35 mm