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
He reached home safely. Choose the appropriate parts of speech of the word is "safely."
A Noun
B Adjective
C Verb
D Adverb
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
Which of the following insulating materials was suitable for low temperature applications?
A Asbestos paper
B Diatomaceous earth
C 80 percent magnesia
D Cork
Out of the following themocouple wire insulating material, the highest temperature rating is for
A Teflon
B Ceramic fibre
C Asbestos
D Fibre glass
The ends of a cylinderical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure.
A Flat plate
B Hemispherical
C Torispherical
D Ellipsoidal
A steam pipe is to be insulated by two insulating materials put over each other. For best results
A Better insulation should be put over pipe and better one over it
B Inferior insulation should be put over pipe and better one over it
C Both may be put in any order
D Whether to put inferior OIL over pipe or the better one would depend on steam temperature
Effect of moisture on the insulating materials is to
A Decrease dielectric constant
B Decrease dielectric strength
C Decrease insulation resistance
D Increase dielectric loss
E All of the above
Insulating materials have the function of
A Preventing a short circuit between conducting wires
B Preventing an open circuit between the voltage source and the load
C Conducting very large currents
D Storing very high currents
A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,
A The better insulation must be put inside
B The better insulation must be put outside
C One could place either insulation on either side
D One should take into account the steam temperature before deciding as to which insulation is put where

Next steps