____________are always double layer type?

Related Mcqs:

1. ____________are used for construction of core of electromagnets?

   A. Soft magnetic materials B. Hard magnetic materials C. Either A. or B. D. None of the above...

2. For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used?

   A. 1.0 to 1.2 A/mm2 B. 1.5 to 2.0 A/mm2 C. 2.2 to 3.2 A/mm2 D. 3.2 to 4.2 A/mm2...

3. Multi-layer helical windings are commonly used in the transformers as high voltage windings_______________?

   A. upto 20 kV B. upto 50 kV C. upto 80 kV D. for 110 kV and above...

4. Which of the following is the commonly used type of electromagnets ?

   A. Flat-faced armature type B. Horse shoe type C. Flat-faced plunger type D. All of the above...

5. The high voltage winding is usually which of the following type ?

   A. Cylindrical winding with circular conductors B. Cross-over winding with either circular or small rectangular conductors C. Continuous disc type winding with rectangular conductors D. All of the above types...

6. Which of the following is the major consideration to evolve a good design ?

   A. Cost B. Durability C. Compliance with performance criteria as laid down in specifications D. All of the above...

7. The heated parts of an electrical machine dissipate heat into their surroundings by which of the following modes of heat dissipation ?

   A. Conduction B. Convection C. Radiation D. All of the above...

8. In direct cooled system using hydrogen both stator and rotor conductors are made____________?

   A. solid B. hollow C. perforated D. any ofthe above...

9. The distance between the starts of two consecutive coils measured in terms of coil sides is called_____________?

   A. front pitch B. winding pitch C. commutator pitch D. back pitch...

10. The operation of a D.C. machine with large air gap lengths is comparatively_____________?

    A. quiet B. noisy C. either of the above D. none of the above...