Thermal conductivity of air increases with rise in temperature.
The transfer of heat from one body to another takes place only when there is a temperature difference between the bodies.
The curved lines on a psychrometric chart indicates
The centrifugal compressors are generally used for refrigerants that require
The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number)n, where n is equal to
The critical pressure of a liquid is the pressure
The specific humidity during dehumidification process
The process, generally used in winter air-conditioning to warm and humidity the air, is called
During gas charging in an ammonia vapour compression system, the connection is made at the compressor outlet.
In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in
The material of pipe lines for a system using ammonia as a refrigerant should be copper.
During humidification process, __________ increases.
The water, alcohol and ammonia have same refrigerating effect at different altitudes.
Conduction is a process of heat transfer
Which of the following refrigerant has the lowest freezing point?
Atrelative humidity, wet bulb temperature, dry bulb temperature, dew point temperature and saturation temperature are equal.
Which of the following statement is correct?
The wave length corresponding to the maximum energy is inversely proportional to the absolute temperature. This statement is called Planck's law.
A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be
The automobile radiator is a heat exchanger of
Thermal diffusivity of a substance is
Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)
For a white body, absorptivity (α ) =reflectivity (ρ) = 1 and transmittivity (τ) = 0.
Bell-Coleman cycle is a
The horizontal and uniformly spaced lines on a psychrometric chart indicates relative humidity.
Which of the following statement is correct for ammonia as a refrigerant?
The counter-current flow heat exchanger can transfer __________ heat than parallel flow heat exchanger.
The freon group of refrigerants are
In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.
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