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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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