What type of coolant is often recommended when engines are operated in sub-arctic winter temperatures?
A. Ethylen glycol (EG).
B. Carboxylate extended life coolant (ELC).
C. Propylene glycol (PG).
D. Waterless coolant. (WC).
Answer: C
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Freon 22 is used as a refrigerant in a vapor-compression refrigeration cycle in the frozen food section of your local supermarket. If the condenser operates at 320 K (saturated liquid leaves the condenser) and the boiler operates at 260 K (saturated vapor leaves the boiler), calculate:
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In the accompanying figure, the item identified as number 1 is the ____.
A. top view B. frontal plane of projection C. front view D. lines of protection
When a liquid boils:
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