What is the primary difference between air-cooled condensers on lower-efficiency systems and those on high-efficiency systems?
A) The coil size is decreased to raise the head pressure and increase the temperature difference.
B) The condenser coils are made from steel instead of copper or aluminum.
C) The number of fins per inch is reduced to reduce the restriction to airflow.
D) The coil size is increased to increase the heat-transfer area.
D
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What component of a heat exchanger is a group of fixed or parallel tubes through which process fluids are circulated?
A) Baffles B) Tube sheet C) Tube bundle D) Spacer rods
Which animal consumes the highest amount of forage as a percent of body weight?
A) Bison B) Horse C) Elk D) White-tailed deer E) Domestic sheep
Answer the following statement(s) true (T) or false (F)
The desired headroom must be known to calculate the stairwell length.
Technician A says that headers do not improve performance at low rpm unless they are specifically tuned for low rpm use. Technician B says that longer header pipes tend to improve low rpm performance. Who is right?
A. ?Technician A only B. ?Technician B only C. ?Both A and B D. ?Neither A nor B