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

Related Mcqs:

1. When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of_____________?

   A. short pitch
   B. full pitch
   C. either of the above
   D. none of the above

2. The winding where dummy coils are used is sometimes called______________?

   A. duplex winding
   B. triplex winding
   C. forced winding
   D. none of the above

3. A current density of __________ is ilsed for large power transformers with forced circulation of oil or with water cooling coils?

   A. 1.5 to 2.5 A/mm2
   B. 3.5 to 4.5 A/mm2
   C. 4.0 to 5.0 A/mm2
   D. 5.4 to 6.2 A/mm2

4. Dummy coil should not be used in_________________?

   A. small machines
   B. large machines
   C. either A. or B.
   D. none of the above

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

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

6. The time taken by the machine to attain 0.632 of its final steady temperature rise is called_____________?

   A. heating time constant
   B. cooling time constant
   C. either A. or B.
   D. none of the above

7. 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

8. 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

9. Which of the following is an advantage of hydrogen cooling ?

   A. Increase in efficiency
   B. Increase in ratings
   C. Increase in life
   D. Smaller size of coolers
   E. All of the above

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

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