Related Questions

A steam carraying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will
A Increase
B Decrease
C Remain unaffected
D May increase or decrease; depends on the thickness of each layer
An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?
A Cork
B Saw dust
C Sand
D Chemically prepared foam
Price of paper has increased by 20%. Approximately, what percent of the paper usage must be curtailed so that the expenditure for paper remains the same?
A 8.66%
B 12.33%
C 16.66%
D 17.33%
The insulating material for a cable should have
A Low cost
B High dielectric strength
C High mechanical strength
D All of the above
The insulating material for cables should
A Be acid proof
B Be non-inflammable
C Be non-hygroscopic
D Have all above properties
Surface resistance of an insulating material is reduced due to the
A Smoky and dirty atmosphere
B Humidity in the atmosphere
C Both A and B
D Neither A nor B
If an insulating material is operated beyond the maximum allowable temperature, its life is
A drastically increased
B drastically reduced
C unaffected
D none of the above
The insulating material used between the commutator segments is normally
A Graphite
B Paper
C Mica
D Insulating varnish
Out of the following which is an insulating material?
A Copper
B Gold
C Silver
D Paper
The insulating material should have
A Low permittivity
B High resistivity
C High dielectric strength
D All of the above

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