The weight of copper of both armature and field windings decreases with __________ in number of poles?

Related Mcqs:

1. The insulation between windings and grounded core and the insulation between the windings of the same phase is called__________________?

   A. minor insulation B. major insulation C. either of the above D. none of the above...

2. 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...

3. cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall______________?

   A. Direct B. Indirect C. Conventional D. Any of the above...

4. __________ has a low relative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable?

   A. Cast steel B. Aluminium C. Soft steel D. Cast iron...

5. By which of the following methods the temperature rise of windings and other parts may be determined ?

   A. Thermometer method B. Resistance method C. Embedded temperature detector method D. Any of the above...

6. The cylindrical windings using circular conductors are used for current rating of____________?

   A. upto 20 A B. upto 40 A C. upto 60 A D. upto 80 A...

7. A practical formula for determining the thickness of insulation between low voltage and high voltage windings is__________________?

   A. 1 + 0.2 kVmm B. 2 + 0.5 kVmm C. 4 + 0.7 kV mm D. 5 + 0.9 kV mm...

8. D.C. windings are____________?

   A. sometimes 2-layer type B. never 2-layer type C. always 2-layer type D. none of the above...

9. Helical windings are used in________________?

   A. distribution transformers B. power transformers C. shell type transformers D. none of the above...

10. Cylindrical windings using circular conductors, employed in transformers, are_____________?

    A. single layered B. double layered C. multi-layered D. none of the above...