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

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

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Refrigeration and Air Conditioning
In a vapour compression refrigeration system, a throttle valve is used in place of an expander because

It considerably reduces mass of the system
The positive work in isentropic expansion of liquid is very small
It leads to significant cost reduction
It improves the C.O.P., as the condenser is small

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