Question:-
A single-stage vapour compression refrigeration system cannot be used to produce ultralow temperatures because
Option (A)
Refrigeration for ultra-low temperatures are not available
Option (B)
Lubricants for ultra-low temperatures are not available
Option(C)
Volumetric efficiency will decrease considerably
Option(D)
Heat leakage into the system will be excessive
Correct Option:
(C)
Question Solution:
To produce ultra-low temperature the compression ratio will increase the volumetric efficiency will decrease
hv = 1+c–c[P2/P1]1/n
question-answer-faq-3158