84951. Planck's law holds good for all coloured bodies.
84952. In mechanical refrigeration system, the refrigerant has the maximum temperature
84953. The capacity of a domestic refrigerator is in the range of
84954. The condition of refrigerant after passing through the condenser in a vapour compression system is
84955. The leakage in a refrigeration system using freon is detected by
84956. If the condenser temperature is kept constant, the coefficient of performance of a refrigeration cycle increases with the increase in evaporator temperature.
84957. The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as
84958. When α is absorptivity, ρ is reflectivity and τ is transmittivity, then for a diathermanous body,
84959. When there is an addition of water vapour to the air of enclosed space, a gain in __________ is said to occur.
84960. The relative humidity __________ as air gets drier.
84961. The central air conditioning system has __________ overall efficiency as compared to individual systems.
84962. An ordinary passenger aircraft requires a cooling system of capacity.
84963. In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is
84964. The thermal diffusivity for solids is generally less than those for liquids and gases.
84965. Conduction is the process of heat transfer from one particle of the body to another by the actual motion of the heated particles.
84966. Moisture should be removed from refrigerants to avoid
84967. During humidification process, dry bulb temperature
84968. Fourier's law of heat conduction gives the heat flow for
84969. The product of Reynolds number and Prandtl number is known as
84970. Carbon dioxide is
84971. The reduced ambient air cooling system has
84972. The heat of sun reaches to us according to
84973. The specific humidity during humidification process
84974. Stefan-Boltzmann law is applicable for heat transfer by convection.
84975. The most commonly used method for the design of duct size is the
84976. In counter-current flow heat exchangers
84977. The rate of heat flow through a body is . The term x/kA is known as
84978. In a vapour compression system, the condition of refrigerant is dry saturated vapour
84979. An evaporator is also known as
84980. The rate of heat flow through a body is . The term is known as temperature gradient.
84981. Oil separator in a refrigeration cycle is installed
84982. In larger industrial and commercial reciprocating compression systems, refrigerent widely used is
84983. During sensible cooling of air, specific humidity
84984. The transfer of heat by molecular collision is known as
84985. In a psychrometric chart, specific humidity (moisture content) lines are
84986. The expression Q = ρ AT4 is called
84987. Thermal conductivity of solid metals __________ with rise in temperature.
84988. The horizontal and non-uniformly spaced lines on a psychrometric chart indicates
84989. A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be
84990. Which of the following refrigerant is highly toxic and flammable?
84991. The unit of Stefan-Boltzmann constant is
84992. The emissive power of a body depends upon its
84993. An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m2). The critical thickness of insulation will be
84994. A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h1, h2 and h3 respectively. The average heat transfer coefficient for the cube is
84995. The dehumidification process, on the psychrometric chart, is shown by
84996. The vertical and uniformly spaced lines on a psychrometric chart indicates
84997. In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = By-pass factor)
84998. The coefficient of performance (C.O.P.) is the reciprocal of the efficiency of a heat engine.
84999. The wet bulb temperature at 100% relative humidity is __________ dry bulb temperature.
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