With conventional hydrogen cooling it is possible to increase the rating of a single unit to___________?

Related Mcqs:

1. 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...

2. 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...

3. In self cooled motors the cooling time constant is about ___________ than the heating time constant because cooling conditions are worse at standstill?

   A. 2 to 3 times greater B. 3 to 4 times greater C. 4 to 5 times greater D. none of the above...

4. Transformers with a capacity of up to __________ have a cooling radiator system with natural cooling?

   A. 2 MVA B. 5 MVA C. 7.5 MVA D. 10 MVA...

5. 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...

6. With direct water cooling it is possible to have ratings of about_____________?

   A. 200 MW B. 300 MW C. 400 MW D. 600 MW...

7. By which of the following methods motor rating for variable load drives can be determined ?

   A. Method of average losses B. Equivalent current method C. Equivalent torque method D. Equivalent power method E. All of the above...

8. 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...

9. Which of the following methods is used for air cooling of turbo-alternators ?

   A. One sided axial ventilation B. Two sided axial ventilation C. Multiple inlet system D. All of the above...

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

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