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The thermal conductivity of hydrogen is _____________ times that of air?
Related MCQs
cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall__________?
With conventional hydrogen cooling it is possible to increase the rating of a single unit to__________?
Hydrogen has a heat transfer co-efficient __________ times that of air?
Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto__________?
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Hot rolled sheets have __________ value of permeability?
Materials exhibiting zero value of resistivity are known as __________ ?
__________is universally used for windings of electrical machines because it is easily workable without any possibility of fracture?
__________ has a low relative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable?
Commercial available medium size machines have a speed range of __________ ?
The change in flux linkages can be caused in which of the following ways ?
The action of electromagnetic machines can be related to which of the following basic principles __________?
The length cf air gap to be provided in __________ is primarily determined by power factor consideration?
The design of mechanical parts is particularly important in case of __________ speed machines?
impose limitation on design__________?
If an insulating material is operated beyond the maximum allowable temperature, its life is__________?
Electrical machines having a power output up to about 750 W may be called__________machines?
In induction motors, the length of air gap in kept as small as mechanically possible is order to have__________?
Which of the following is the major consideration to evolve a good design ?
The efficiency of a machine should be as __________ as possible to reduce the operating cost?
Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as__________?
In _________ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft?
The thermal conductivity of hydrogen is _____________ times that of air?
A. 2
B. 3
C. 5
D. 7
Correct Answer:
7
✔
Last Updated:
December 22, 2018