Helical windings are used in________________?

Related Mcqs:

1. 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

2. 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

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. 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

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

   A. increase
   B. decrease
   C. either of the above
   D. none 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. Disc windings are primarily used in_____________-?

   A. short capacity transformers
   B. medium capacity transformers
   C. high capacity transformers
   D. any 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