141 mid term review/ final part 1

Thermostatic expansion valves are the only metering devices used in high pressure chillers.

• True

• False

To unload a reciprocating compressor, hot gas bypass across the cylinder is the best method.

• True

• False

When referring to evaporators, the terms "direct expansion" and "dry type" can be used interchangeably.

• True

• False

High pressure chillers use either air- or water-cooled condensers.

• True

• False

Low pressure chillers use either air- or water-cooled condensers.

• True

• False

Lithium bromide is ideal for use in absorption systems because it is non-corrosive.

• True

• False

Electronic starters are much smaller than conventional starters.

• True

• False

The evaporator of a chiller can be used to absorb heat from ____.

• water

• a solution of water and polyethylene glycol

• the refrigerant

• both a and b

A benefit of operating a compressor unloaded is ____.

• reduced energy costs

• reduced compression ratios

• increased cooling

• both a and b

A reciprocating compressor with six cylinders, three banks of two cylinders each, can have its capacity reduced by unloading to ____% of full capacity.

• 12.5

• 25

• 33-1/3

• 50