Related Questions

A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place
A The better insulation material should be put just next to pipe (i.e., inside)
B The better insulating material should be put outside
C Either of the insulating material could be put on either side
D Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe)
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
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
In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will
A Increase
B Decrease
C Remain unchanged
D Either increase or decrease; depends on the coolant flow rate
Which of the following is the most widely used heat insulating material for pipelines carrying steam?
A Tar dolomite bricks followed by asbestos
B Fireclay refractory followed by aluminium sheet
C Cotton followed by aluminium foil
D 85% magnesia cement and glass wool
Venturimeters, orificemeters and nozzles are used to measure the fluid discharge from a pipeline. The average fluid velocity in a pipeline can be measured by a/an
A Weir
B Hot wire anemometer
C Cup and vane aneometer
D None of these
The line insulation is the insulation level of the station equipment.
A less than
B same as
C more than
D proportional to
E not directly related with
The insulation between windings and grounded core and the insulation between the windings of the same phase is
A minor insulation
B major insulation
C either of the above
D none of the above
Upto the critical radius of insulation, added insulation, will
A Increase the heat loss
B Decrease heat loss and will have no effect beyond that
C Decrease heat flux
D Reduce convection heat loss compared to conduction heat less
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

Next steps