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