Given gauge suction pressure 3 psi, gauge discharge pressure 10 psi, atmospheric pressure 14.7 psi. The ratio of absolute discharge pressure to absolute suction pressure is closest to:

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Prepare for the New York City Refrigeration License Exam I. Utilize flashcards, multiple-choice questions, and detailed explanations to boost your readiness. Ace your licensing exam!

Multiple Choice

Given gauge suction pressure 3 psi, gauge discharge pressure 10 psi, atmospheric pressure 14.7 psi. The ratio of absolute discharge pressure to absolute suction pressure is closest to:

Explanation:
In refrigeration practice, convert gauge pressures to absolute by adding the atmospheric pressure, then compare the resulting absolute pressures. Absolute suction pressure = 14.7 + 3 = 17.7 psi Absolute discharge pressure = 14.7 + 10 = 24.7 psi Ratio = 24.7 / 17.7 ≈ 1.39 So the ratio of absolute discharge to absolute suction pressure is about 1.39. The key idea is that both pressures include the same atmospheric term, so the ratio reflects the gauge values adjusted by that common addition.

In refrigeration practice, convert gauge pressures to absolute by adding the atmospheric pressure, then compare the resulting absolute pressures.

Absolute suction pressure = 14.7 + 3 = 17.7 psi

Absolute discharge pressure = 14.7 + 10 = 24.7 psi

Ratio = 24.7 / 17.7 ≈ 1.39

So the ratio of absolute discharge to absolute suction pressure is about 1.39. The key idea is that both pressures include the same atmospheric term, so the ratio reflects the gauge values adjusted by that common addition.

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