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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

Brass
Copper
Steel
Aluminium

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Refrigeration and Air Conditioning
Nusselt number (NN) is given by

NN = ρ V l /μ
NN = hl/k
NN = μ cp/k
NN = V²/t.cp

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Refrigeration and Air Conditioning
The relative humidity lines on a psychrometric chart are

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

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Refrigeration and Air Conditioning
The dry bulb temperature lines, on the psychrometric chart are

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

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Refrigeration and Air Conditioning
The leaks in a refrigeration system using Freon are detected by

Smelling
Halide torch which on detection produces greenish flame lighting
Using reagents
Sulphur sticks which on detection gives white smoke

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Refrigeration and Air Conditioning
The wet bulb temperature at 100% relative humidity is___ dry bulb temperature.

Same as
Higher than
Lower than
None of the listed here

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