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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is

Same
More or less depending on ambient conditions
Less
More

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Refrigeration and Air Conditioning
Most of the domestic refrigerators work on the following refrigeration system

Vapour absorption
Electrolux refrigerator
Vapour compression
Carnot cycle

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Refrigeration and Air Conditioning
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)

(h1 - h2)/ (hA - h2)
(hA - h2)/ (h1 - h2)
(h2 - hA)/ (h1 - h2)
(hA - h1)/ (h2 - h1)

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Refrigeration and Air Conditioning
Hydrogen is used in Electrolux refrigeration system so as to _________ the rate of evaporation of the liquid ammonia passing through the evaporator.

None of these
Equalize
Increase
Reduce

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Refrigeration and Air Conditioning
Air refrigeration operates on

Rankine’s cycle
Reversed Carnot cycle
Carnot cycle
Brayton cycle

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Refrigeration and Air Conditioning
In a refrigerating machine, heat rejected is _________ heat absorbed.

Equal to
Greater than
Less than
None of these

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