84801. If a gas is to be liquified, its temperature must be
84802. The thermostatic expansion valve is used in __________ type of evaporators.
84803. According to Prevost's theory of exchanges, every body irrespective of its temperature continuously emit heat radiations to the surrounding bodies and at the same time receives heat radiations from the surrounding bodies.
84804. In a boot-strap air evaporative cooling system, the evaporator is provided
84805. According to Stefan-Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the
84806. A good refrigerant should have
84807. The thermal diffusivity for gases is generally __________ those for liquids.
84808. The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is
84809. The process of adding moisture to the air, without change in its dry bulb temperature, is known as humidification.
84810. In case of liquids and gases, the heat transfer takes place according to
84811. The logarithmic mean temperature difference (tm) is given by (where Δt1 and Δt2 are temperature differences between the hot and cold fluids at entrance and exit)
84812. The radiation emitted by a black body is known as
84813. The sensible heat during humidification process decreases.
84814. According to Newton's law of cooling, the heat transfer from a hot body to a cold body is
84815. The freezing point of carbon dioxide is equal to boiling point of R-12.
84816. The condition of refrigerant as it leaves the compressor in a vapour compression system is
84817. The super-heating in a refrigeration cycle
84818. Thermal conductivity of a material may be defined as the
84819. During sensible heating of air, specific humidity remains constant.
84820. Air refrigeration cycle is used in
84821. The wet bulb depression is zero when relative humidity is
84822. In a shell and coil condenser, water flows in the shell and the refrigerant in the coil.
84823. In a saturated air-water vapour mixture, the
84824. Dew point temperature corresponds to the saturation temperature of vapour at its partial pressure.
84825. The capillary tube is not used in large capacity refrigeration systems because
84826. The ratio of emissive power of a body to the emissive power of a perfectly black body is called emissivity.
84827. The thermostatic expansion valve operates on the changes in the
84828. In a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is
84829. The freezing point of R-12 is
84830. The refrigerant supplied to a compressor must be
84831. The unit of thermal diffusivity is
84832. The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)
84833. The dry bulb temperature lines, on the psychrometric chart are
84834. The pressure at the outlet of a refrigerant compressor is called
84835. A simple air cooling system is good for __________ flight speeds.
84836. The highest temperature during the cycle in a vapour compression system occurs after evaporation.
84837. In a psychrometric chart, dew point temperature lines are horizontal and non-uniformly spaced.
84838. If the evaporator temperature is kept constant, the coefficient of performance of a refrigeration cycle __________ with the increase in condenser temperature.
84839. The evaporator used in house-hold refrigerators is
84840. The drier in a refrigeration system removes moisture in the system.
84841. The __________ point of ammonia is -77.7°C.
84842. Sulphur dioxide has the lowest boiling point.
84843. For a given dry bulb temperature, as the relative humidity __________ the wet bulb temperature will increase.
84844. The lowest thermal diffusivity is of
84845. A low wet bulb temperature indicates very __________ humidity.
84846. The operating temperature of a cold storage is - 2° C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40° C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is
84847. In chemical dehumidification process,
84848. A one tonne refrigerating machine means that
84849. The air cooling system mostly used in transport type aircrafts is
84850. The critical thickness of insulation is the ratio of thermal conductivity of the insulating material (k) to the heat transfer coefficient at the outer surface of the insulation (h0).
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