Printable worksheets, a different set for every student
A class set of UEERA0036 worksheets: every student gets their own figures, the answer key gives every answer and its working, and each sheet’s code opens it online so a student can check their answers after class.
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Sheet 1, as it prints
KelvinUEERA0036 practice · Sheet 1 of 20Code FZZX8-TMJ31Work each answer out from the readings and give it in the unit asked. Show your working in the space under each question.
- 1
The suction gauge on an R-32 system reads 9.4 bar g. What is the absolute pressure, in kPa abs?
Answer kPa abs - 2
The liquid line gauge on an R-449A system reads 2,146 kPa g. What is that in psi g?
Answer psi g - 3
R-1234yf is a single-component refrigerant. Its gauge reads 11 psi g. What is its saturation temperature, in °C?
Answer °C - 4
An idle R-717 system has stood at 32 °C long enough to settle. What should its gauge read, in kPa g?
Answer kPa g - 5
R-404A is a blend. Its suction gauge reads 581 kPa g. What is its dew point, in °C?
Answer °C - 6
R-449A is a blend. Its liquid line gauge reads 1,940 kPa g. What is its bubble point, in °C?
Answer °C - 7
An R-1234yf system: the suction gauge reads 6 psi g and the suction line, at the evaporator outlet, reads −16.7 °C. What is the superheat, in K?
Answer K - 8
An R-410A system: the liquid line gauge reads 22.4 bar g and the liquid line, at the condenser outlet, reads 28.3 °C. What is the subcooling, in K?
Answer K - 9
An R-290 system's liquid line gauge reads 1,479 kPa g. What liquid line temperature gives 4 K of subcooling, in °C?
Answer °C - 10
On an R-1234yf system the suction gauge reads 246 kPa g at the evaporator outlet and 228 kPa g at the compressor. How far does the saturation temperature fall between the two, in K?
Answer K - 11
On an R-290 system the suction gauge reads 2.5 bar g at the evaporator outlet, where the suction line reads −6.1 °C, and 2.3 bar g at the compressor, where it reads 0.4 °C. How much superheat does the vapour gain between the two, in K?
Answer K - 12
R-455A at 54 psi g: what is its glide (the dew point less the bubble point), in K?
Answer K - 13
On an R-407C system the gauge reads 175 psi g where a probe on the pipe reads 25.2 °C. What state is the refrigerant in there?
- A Superheated vapour
- B Saturated: liquid and vapour can sit together
- C Subcooled liquid
- D Supercritical: above the critical point
- 14
R-407C is a zeotropic blend. At the suction pressure, which temperature is its superheat measured from?
- A The dew point
- B The liquid line temperature
- C Halfway between the bubble and dew points
- D The bubble point
- 15
R-449A is a zeotropic blend. At the liquid line pressure, which temperature is its subcooling measured from?
- A The bubble point
- B The suction line temperature
- C The dew point
- D Halfway between the bubble and dew points
- 16
The suction line reads colder than the dew point at the suction pressure, so the superheat works out negative. What does that point to?
- A Liquid may be reaching the suction line, or a reading or the refrigerant chosen is off
- B A blend always reads a negative superheat
- C The vapour is well superheated and the system is running normally
- D The liquid line is subcooled
- 17
A refrigeration gauge reads gauge pressure (kPa g). What is gauge pressure measured against?
- A The pressure of the air around it
- B The refrigerant's critical pressure
- C A perfect vacuum
- D The condensing pressure
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