For an evaporator to operate at peak efficiency, _____.

a. the fin spacing should be very wide
b. all of the surface area inside the tubes must be exposed to flashing liquid
c. the coil temperature should always be higher than the dew point of the air
d. the subcooling of the entering refrigerant should be kept to a minimum


b. all of the surface area inside the tubes must be exposed to flashing liquid

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Steam expands in a piston-cylinder arrangement from 800 kPa to 120 kPa while the temperature remains constant at 100ºC. The entropy change is nearest:

A) 6.1 kJ/kg·K B) 6.5 kJ/kg·K C) 7.0 kJ/kg·K D) 7.3 kJ/kg·K

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? Identify and state the historical significance of James A. Garfield.

What will be an ideal response?

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?The maximum weld reinforcement of the cover pass should be _________.

A. ?1/16 in (1.6 mm) B. ?1/8 in (3 mm) C. ?3/32 in (2.4 mm) D. ?5/32 in (4 mm)

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Carry the answer to two decimal places. In replacing 55 lamp bulbs, an apprentice breaks 6. Find to the nearer hundredth percent the percent broken.

Fill in the blank(s) with the appropriate word(s).

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