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For the following questions answer them individually
In regenerator type heat exchanger, heat transfer takes place by
direct mixing of hot and cold fluids
a complete separation between hot and cold fluids
flow of hot and cold fluids alternately over a surface
generation of heat again and again
Film coefficient is the ratio of _____.
Thickness of film of fluid to thermal conductivity
Thickness of film of fluid to temperature drop through film of fluid
Thermal conductivity to temperature drop through film of fluid
Thermal conductivity to equivalent thickness of film of fluid
Highest thermal diffusivity is of _____.
Iron
Lead
Concrete
Wood
Highest thermal conductivity is of _____.
Solid ice
Melting ice
Water
Steam
The ratio of work done per cycle to the swept volume in case of compressor is called
compression index
compression ratio
compressor efficiency
mean effective pressure
The indicator diagram shown in the figure below obtained on a compressor shows that _______.
suction valve or piston rings, or both are leaking
discharge valve is leaking into cylinder during compression stroke
slow opening suction valve
suction valve sticking open at beginning of compression stroke
Metals are good heat conductors because _____.
of free electrons present
their atoms are relatively far apart
their atoms collide frequently
All options are correct
Heat is transferred from an insulated pipe to the surrounding still air by _____.
Conduction
Convection
Radiation
Heat is transferred by conduction, convection and radiation in _____.
Boiler furnaces
Melting of ice
Condensation of steam in condenser
None of these
In optical pyrometers absorption filter is used _____.
To get monochromatic light
To eliminate stray rays of light
To minimise reflection of rays from the lens surface
To enable filament operation at reduced intensity for longer life
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