Electrical Engineering Questions And Answers :: Electrical Machine Design: part1

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Electrical Engineering : Electrical Machine Design QUESTIONS AND ANSWERS :: part1 : 16 to 20

Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :

16.The efficiency of a machine should be as ______ as possible to reduce the operating cost.

high
low
either of the above
none of the above

17.The mcrease in heat dissipation by air blasts is due to increase in

conduction
convection
radiation
any ofthe above

18.________ has a lowrelative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable.

Cast steel
Aluminium
Soft steel
Cast iron

19.The change in flux linkages can be caused in which ofthe following ways ?

The flux is constant with respect to time and is stationary and the coil moves through it
The coil is stationary with respect to flux and the flux varies in magnitude with respect to time
Both the changes mentioned above occure together, i.e., the coil moves through a time varying field
All ofthe above

20.Electrical machines having power outputs ranging from a few kW upto approximately 250 kW may be classified as

small size machines
medium size machines
large size machines
any ofthe above

More Electrical Machine Design QUESTIONS AND ANSWERS available in next pages

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