Pressure Enthalpy quiz for Technicians and Apprentices

Try our test on PH Chart essentials and fundamentals.

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1. A pressure enthalpy chart is used to...

shows the temperature/enthalpy characteristics of a refrigerant at different pressures

illustrate properties of a specific refrigerant type

measure test pressures for system tightness and pressure integrity

identify risks related to different types of refrigerant

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2. Define Saturated liquid

Where the liquid has been cooled below its saturated temperature.

A vapour which is at the saturation temperature.

A liquid which is at the saturation temperature. At this point any additional heat applied to the liquid will cause part of it to evaporate.

Where the refrigerant is above its saturation temperature.

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3. Which of these statements about this PH chart is correct

The right side of the curve is saturated liquid

The left side is saturated vapour

The left side of the curve is saturated liquid

The top of the curve is the subcooled liquid zone

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4. What is superheat?

where the refrigerant is below its saturation temperature

where the refrigerant is at its saturation temperature

where the refrigerant is above its saturation temperature

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5. How do you use a PH chart to calculate the theoretical coefficient of performance for cooling?

Dividing the length of the evaporation process by the horizontal length of the compression process

Dividing the length of the condensing process by the horizontal length of the compression process

Dividing the length of the condensing process by the vertical length of the compression process

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6. What is apositive effect of increased subcooling?

It increases the efficiency of the system since the amount of heat being removed per pound of refrigerant circulated is greater.

The compressor runs longer and mass flow is reduced

There will be a drop in evaporating temperature

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7. How does a PH diagram help you to identify refrigerant leakage?

reduced pressures and temperatures in condenser and evaporator, the high superheat at compressor inlet and discharge

discharge pressure is low, the suction pressure is high, the discharge superheat is high and there is vapour in the liquid line.

Pressure Enthalpy quiz for Technicians and Apprentices

Question Title

* 1. A pressure enthalpy chart is used to...

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* 2. Define Saturated liquid

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* 3. Which of these statements about this PH chart is correct

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* 4. What is superheat?

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* 5. How do you use a PH chart to calculate the theoretical coefficient of performance for cooling?

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* 6. What is apositive effect of increased subcooling?

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* 7. How does a PH diagram help you to identify refrigerant leakage?

1. A pressure enthalpy chart is used to...

2. Define Saturated liquid

3. Which of these statements about this PH chart is correct

4. What is superheat?

5. How do you use a PH chart to calculate the theoretical coefficient of performance for cooling?

6. What is apositive effect of increased subcooling?

7. How does a PH diagram help you to identify refrigerant leakage?