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
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 disadvantage with paper as insulating material is
A It is hygroscopic
B It has high capacitance
C It is an organic material
D None of the above
Which of the following is the most widely used insulating material for steam carray-ing pipelines?
A Ceramic fibre blanket
B Glass wool and 85% magnesia
C Vermiculite
D Slag wool

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