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Which of the following statement is correct?

A. The human body can lose heat even if its temperature is less than the atmospheric temperature.

B. The increase in air movement increases the evaporation from the human body.

C. The warm air increases the rate of radiation of heat from the human body.

D. Both (A) and (B)

Correct Answer :

D. Both (A) and (B)


Related Questions

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One ton refrigeration corresponds to

A. 50 kcal/ min

B. 50 kcal/ hr

C. 80 kcal/ min

D. 80 kcal/ hr

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

A. Dry bulb temperature

B. Wet bulb temperature

C. Dew point temperature

D. Specific humidity

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4

An important characteristic of absorption system of refrigeration is

A. Noisy operation

B. Quiet operation

C. Cooling below 0°C

D. Very little power consumption

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The coefficient of performance of Heat Pump is always __________ one.

A. Equal to

B. Less than

C. Greater than

D. None of these

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The specific humidity during humidification process

A. Remains constant

B. Increases

C. Decreases

D. None of these

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The total pressure exerted by the mixture of air and water vapour is equal to the sum of pressures which each constituent would exert, if it occupied the same space by itself. This statement is called

A. Kinetic theory of gases

B. Newton's law of gases

C. Dalton's law of partial pressures

D. Avogadro's hypothesis

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During humidification process, __________ increases.

A. Wet bulb temperature

B. Relative humidity

C. Dry bulb temperature

D. Specific humidity

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The Freon group of refrigerants are

A. Halocarbon refrigerants

B. Zoetrope refrigerants

C. Inorganic refrigerants

D. Hydrocarbon refrigerants

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The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

A. Sub-cooling or under-cooling

B. Super-cooling

C. Normal cooling

D. None of these

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4

The relative humidity lines on a psychrometric chart are

A. Vertical and uniformly spaced

B. Horizontal and uniformly spaced

C. Horizontal and non-uniformly spaced

D. Curved lines

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4

One tonne of refrigeration (1TR) means that the heat removing capacity is

A. 21 kJ/min

B. 210 kJ/min

C. 420 kJ/min

D. 620 kJ/min

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4

Condensing temperature in a refrigerator is the temperature

A. Of cooling medium

B. Of freezing zone

C. Of evaporator

D. At which refrigerant gas becomes liquid

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Most thermostatic expansion valves are set for a superheat of

A. 5°C

B. 10°C

C. 15°C

D. 20°C

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The pressure at the outlet of a refrigerant compressor is called

A. Suction pressure

B. Discharge pressure

C. Critical pressure

D. Back pressure

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In vapour compression cycle the condition off refrigerant is dry saturated vapour

A. After passing through the condenser

B. Before passing through the condenser

C. After passing through the expansion or throttle valve

D. Before entering the compressor

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If a gas is to be liquefied, its temperature must be

A. Increased to a value above its critical temperature

B. Reduced to a value below its critical temperature

C. Equal to critical temperature

D. None of the above

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A standard ice point temperature corresponds to the temperature of

A. Water at 0°C

B. Ice at 4°C

C. Solid and dry ice

D. Mixture of ice and water under equilibrium conditions

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In mechanical refrigeration system, the refrigerant has the maximum temperature

A. In evaporator

B. Before expansion valve

C. Between compressor and condenser

D. Between condenser and evaporator

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The condition of refrigerant as it leaves the compressor in a vapour compression system is

A. Saturated liquid

B. Wet vapour

C. Dry saturated vapour

D. Superheated vapour

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R-12 is generally preferred over R-22 in deep freezers since

A. It has low operating pressures

B. It gives higher coefficient of performance

C. It is miscible with oil over large range of temperatures

D. All of the above

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During heating and dehumidification process, dry bulb temperature

A. Remains constant

B. Increases

C. Decreases

D. None of these

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The conditioned air supplied to the room must have the capacity to take up

A. Room sensible heat load only

B. Room latent heat load only

C. Both room sensible heat and latent heat loads

D. None of the above

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The advantage of dry compression is that

A. It permits higher speeds to be used

B. It permits complete evaporation in the evaporator

C. It results in high volumetric and mechanical efficiency

D. All of the above

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The higher temperature in vapour compression cycle occurs at

A. Receiver

B. Expansion valve

C. Evaporator

D. Compressor discharge

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The sensible heat factor during the heating and humidification process is given by (where h₁ = Enthalpy of air entering the heating coil, h₂ = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)

A. (hA - h2)/ (h1 - h2)

B. (h2 - hA)/ (h1 - h2)

C. (h1 - h2)/ (hA - h2)

D. (hA - h1)/ (h2 - h1)

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The vertical and uniformly spaced lines on a psychrometric chart indicates

A. Dry bulb temperature

B. Wet bulb temperature

C. Dew point temperature

D. Specific humidity

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4

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

A. 1.33

B. 2.33

C. 3.33

D. 4.33

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One of the purposes of sub cooling the liquid refrigerant is to

A. Reduce compressor overheating

B. Reduce compressor discharge temperature

C. Increase cooling effect

D. Ensure that only liquid and not the vapour enters the expansion (throttling) valve

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An infinite parallel planes with emissivities e₁ and e₂, the interchange factor for radiation from surface 1 to surface 2 is given by

A. (e₁ + e₂)/ e₁ + e₂ - e₁e₂

B. 1/e₁ + 1/e₂

C. e₁ + e₂

D. e₁e₂

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The moisture in a refrigerant is removed by

A. Evaporator

B. Safety relief valve

C. Dehumidifier

D. Driers