In D.C. machines the width of the duct is usually_____________?
In D.C. machines the width of the duct is usually_____________?
A. 4 mm
B. 6 mm
C. 8 mm
D. 10 mm
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By which of the following methods the temperature rise of windings and other parts may be determined ?
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 aboveIn D.C. machines, the ________ in field mmf results in increase in size and cost of machines?
In D.C. machines, the ________ in field mmf results in increase in size and cost of machines?A. increase
B. decrease
C. either of the above
D. none of the aboveYokes with rectangular cross-section are used for_______________?
Yokes with rectangular cross-section are used for_______________?A. small capacity transformers
B. medium capacity transformers
C. large capacity transformers
D. any of the aboveThe operation of a D.C. machine with large air gap lengths is comparatively_____________?
The operation of a D.C. machine with large air gap lengths is comparatively_____________?A. quiet
B. noisy
C. either of the above
D. none of the aboveWhich of the following methods is used for air cooling of turbo-alternators ?
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 aboveA current density of __________ is ilsed for large power transformers with forced circulation of oil or with water cooling coils?
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