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You Are On Multi Choice Question Bank SET 1433

71651. Conduction is the process of heat transfer from one particle of the body to another by the actual motion of the heated particles.



71652. Moisture should be removed from refrigerants to avoid





71653. During humidification process, dry bulb temperature




71654. Fourier's law of heat conduction gives the heat flow for





71655. The product of Reynolds number and Prandtl number is known as





71656. Carbon dioxide is





71657. The reduced ambient air cooling system has





71658. The heat of sun reaches to us according to





71659. The specific humidity during humidification process




71660. Stefan-Boltzmann law is applicable for heat transfer by convection.



71661. The most commonly used method for the design of duct size is the





71662. In counter-current flow heat exchangers





71663. The rate of heat flow through a body is . The term x/kA is known as





71664. In a vapour compression system, the condition of refrigerant is dry saturated vapour





71665. An evaporator is also known as





71666. The rate of heat flow through a body is . The term is known as temperature gradient.



71667. Oil separator in a refrigeration cycle is installed





71668. In larger industrial and commercial reciprocating compression systems, refrigerent widely used is





71669. During sensible cooling of air, specific humidity




71670. The transfer of heat by molecular collision is known as





71671. In a psychrometric chart, specific humidity (moisture content) lines are





71672. The expression Q = ρ AT4 is called





71673. Thermal conductivity of solid metals __________ with rise in temperature.




71674. The horizontal and non-uniformly spaced lines on a psychrometric chart indicates





71675. 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





71676. Which of the following refrigerant is highly toxic and flammable?





71677. The unit of Stefan-Boltzmann constant is





71678. The emissive power of a body depends upon its





71679. 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





71680. 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




71681. The dehumidification process, on the psychrometric chart, is shown by





71682. The vertical and uniformly spaced lines on a psychrometric chart indicates





71683. In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = By-pass factor)




71684. The coefficient of performance (C.O.P.) is the reciprocal of the efficiency of a heat engine.



71685. The wet bulb temperature at 100% relative humidity is __________ dry bulb temperature.




71686. The freezing point of sulphur dioxide is





71687. The ratio of the energy absorbed by the body to the total energy falling on it, is called





71688. The coefficient of performance of a domestic refrigerator is __________ as compared to a domestic air-conditioner.




71689. The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body





71690. The human body feels comfortable when the heat stored in the body is





71691. A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in __________ power per tonne of refrigeration.




71692. The amount of heat flow through a body by conduction is





71693. A furnace is made of a red brick wall of thickness 0.5 m and conductivity 0.7 W/mK. For the same heat loss and temperature drop, this can be replaced by a layer of diatomite earth of conductivity 0.14 W/mK and thickness




71694. In a refrigeration system, the expansion device is connected between the





71695. The heat rejection factor (HRF) is given by



71696. Wein's law states that the wave length corresponding to __________ is proportional to the absolute temperature.



71697. In a domestic vapour compression refrigerator, the refrigerant commonly used is





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