A. 2 to 3 times greater
B. 3 to 4 times greater
C. 4 to 5 times greater
D. none of the above
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Related Mcqs:
- Machines cooled by direct cooling method may be called_____________?
- A. “supercharged” B. “inner cooled” C. “conductor cooled” D. any of the above...
- 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...
- 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...
- 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...
- The noise produced by a ___________ cooled machine is less as the rotor moves in a medium of smaller density?
- A. air B. hydrogen C. either A. or B. D. none of the above...
- In direct cooled system using hydrogen both stator and rotor conductors are made____________?
- A. solid B. hollow C. perforated D. any ofthe above...
- In induction motors, the length of air gap in kept as small as mechanically possible is order to have____________?
- A. low power factor B. high power factor C. high over load capacity D. any of the above...
- Which of the following materials is used in the manufacture of resistance grids to be used in the starters of large motors ?
- A. Copper B. Aluminium C. Steel D. Cast-iron...
- Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?
- A. Increased I R losses B. Increased core losses C. Poor commutation D. Change in motor parameters E. All of the above...
- Which of the following in an application of D.C. motors?
- A. Traction B. Drives for process industry C. Battery driven vehicles D. Automatic control E. All of the above...
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