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REAL Alternatives Module 2 Design Differences for Alternative Refrigerants | 32 Self Test Module 2 Try the sample multiple choice assessments below to check your learning Question 1 ‐ What is the pressure of R744 in a system which is at standstill in an ambient temperature of 20OC? i. 4.9 bar g ii. 7.4 bar g iii. 55barg iv. 72.8 bar g Question 2 – What is the approximate displacement required for a compressor operating on R600a compared to one operating on R134a to give the same cooling capacity? I. Seven times II. Two times III. The same IV. Half Question 3 – Below which condensing temperature is a R744 system subcritical? I. 55° C II. 43° C III. 31° C IV. 72° C Question 4 – When using R1270 above which temperature do hot surfaces become sources of ignition? I. 60° C II. 150° C III. 260° C IV. 360° C The answers are on the bottom of the next page.PDF Image | Alternative Refrigerants
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