The stator of a D.C. machine comprises of ? A. main poles B. interpoles C. frame D. all of the above View Answer D. all of the above
The action of electromagnetic machines can be related to which of the following basic principles ? Machine Design MCQs
__________ has a low relative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable ? Machine Design MCQs
________ is universally used for windings of electrical machines because it is easily workable without any possibility of fracture ? Machine Design MCQs
In _________ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft ? Machine Design MCQs
Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as ? Machine Design MCQs
The efficiency of a machine should be as ____________ as possible to reduce the operating cost ? Machine Design MCQs
In induction motors, the length of air gap in kept as small as mechanically possible is order to have ? Machine Design MCQs
Aluminium when adopted as a conductor material in __________ transformers, decreases the overall cost of the transformer ? Machine Design MCQs
__________ is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ? Machine Design MCQs
The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc ? Machine Design MCQs
Electrical machines having a power output up to about 750 W may be called __________ machines ? Machine Design MCQs
If an insulating material is operated beyond the maximum allowable temperature, its life is ? Machine Design MCQs
The design of mechanical parts is particularly important in case of __________ speed machines ? Machine Design MCQs
The length cf air gap to be provided in __________ is primarily determined by power factor consideration ? Machine Design MCQs
