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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The domestic refrigerator uses following type of compressor

Centrifugal
Piston type reciprocating
Miniature sealed unit
Axial

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Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

25 kJ/kg
100 kJ/kg
125 kJ/kg
50 kJ/kg

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Refrigeration and Air Conditioning
In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

Reversed Carnot cycle
Reversed Brayton cycle
Reversed Otto cycle
Reversed Joule cycle

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Refrigeration and Air Conditioning
In aqua ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in

Condenser
Evaporator
None of these
Absorber

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Refrigeration and Air Conditioning
Condensing temperature in a refrigerator is the temperature

At which refrigerant gas becomes liquid
Of evaporator
Of freezing zone
Of cooling medium

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Refrigeration and Air Conditioning
In a psychrometric chart, specific humidity (moisture content) lines are

Curved lines
Horizontal and uniformly spaced
Vertical and uniformly spaced
Horizontal and non-uniformly spaced

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