Vacuum efficiency of a condenser is defined as: (a) (frac{text { Actual vacuum in condenser with air

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Vacuum efficiency of a condenser is defined as:

(a) \(\frac{\text { Actual vacuum in condenser with air present }=p_{b}-p_{t}}{\text { Theoretical vacuum in condenser without air present }=p_{b}-p_{s}}\)

(b) \(\frac{\text { Theoretical vacuum in condenser without air present }}{\text { Actual vacuum in condenser with air present }}\)

(c) \(\frac{p_{s}+p_{a}}{p_{s}}\)

(d) \(\frac{p_{s}}{p_{s}+p_{a}}\)

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