Computer Programming MCQs

5739 MCQs  (Page 258 of 574)

Machines cooled by direct cooling method may be called_____________?
A. “supercharged”
B. “inner cooled”
C. “conductor cooled”
D. Any of the above
Direct water cooling of rotor winding presents_____________?
A. No mechanical difficulties
B. Lesser mechanical difficulties
C. Greater mechanical difficulties
D. None of the above
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
Which of the following methods does not take into account the maximum temperature rise under variable load conditions ?
A. Equivalent power method
B. Equivalent current method
C. Method of average losses
D. Equivalent torque method
The slot leakage can be calculated by making which of the following assumptions ?
A. The current in the slot conductors is uniformly distributed over their cross-section
B. The leakage path is straight across the slot and around the iron at the bottom
C. The permanence of air paths is only considered. the reluctance of iron paths is assumed as zero
D. All of the above