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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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  16. A good refrigerant should have
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  18. Which of the following refrigerant has the lowest freezing point?
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  28. The C.O.P. of a heat pump working on a reversed Carnot cycle is
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