A single-stage vapour compression refrigeration system cannot be used to produce ultralow temperatures because:

lunbricants for ultra-low temperatures are not available

Refrigerants for ultra-low temperatures are not available

Volumetric efficiency will decrease consider- ably

Heat leakage into the system will be excessive

A single-stage vapour compression refrigeration system cannot be used

1.	A single-stage vapour compression refrigeration system cannot be used to produce ultralow temperatures because:
A.	Refrigerants for ultra-low temperatures are not available
B.	lunbricants for ultra-low temperatures are not available
C.	Volumetric efficiency will decrease consider- ably
D.	Heat leakage into the system will be excessive
Answer» B. lunbricants for ultra-low temperatures are not available

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A single-stage vapour compression refrigeration system cannot be used to produce ultralow temperatures because:

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