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Consider an R-410A air-conditioning system operating with a suction pressure of 118 psig and an oil pump discharge pressure of 185 psig. What is the net oil pressure?

A. 118 psig
B. 67 psig
C. 185 psig
D. 303 psig

Answer :

To solve the problem, we need to find the net oil pressure in the air-conditioning system. Here are the steps to do so:

1. Identify the Pressures:
- Suction Pressure: This is the pressure at the suction side of the system, which is given as 118 psig (pounds per square inch gauge).
- Discharge Pressure: This is the pressure at the discharge side of the system, which is given as 185 psig.

2. Calculate the Net Oil Pressure:
- The net oil pressure is the difference between the discharge pressure and the suction pressure.
- To find the net oil pressure, subtract the suction pressure from the discharge pressure.

Formula:
[tex]\[
\text{Net Oil Pressure} = \text{Discharge Pressure} - \text{Suction Pressure}
\][/tex]

3. Perform the Calculation:
- Use the given values:
[tex]\[
\text{Net Oil Pressure} = 185 \, \text{psig} - 118 \, \text{psig}
\][/tex]

4. Result:
- The calculation gives a net oil pressure of 67 psig.

Therefore, the correct answer to the question about the net oil pressure is b. 67 psig.

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