In D.C. machines, the ____ in field mmf results in increase in size and cost of machines.

Related MCQs

• In D.C. machines, ir order to prevent excessive distortion of field form by the armature reaction, the field mmf must be made
• In ______ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft.
• Commercial available medium size machines have a speed range of ______ .
• ________ has a lowrelative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable.
• The design of mechanical parts is particularly important in case of _____ speed machines.
• Electrical machines having a power output upto about 750 W may be called_______machines.
• Electrical machines having power outputs ranging from a few kW upto approximately 250 kW may be classified as
• The action of electromagnetic machines can be related to which ofthe following basic principles ?
• is universally used for windings of electrical machines because it is easily workable without any possibility of fracture.
• Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto