49.
Which statement is correct concerning fan performance with respect to fan
speed, horsepower, total pressure, and mechanical efficiency?
a. Measurements should agree within 10 percent of the design basis. If not,
m o d i f y t h e f a n u n t i l i t m e e t s d e s i g n u n criteria.
b. Measurements should agree within 15 percent of the design basis.
c.
Prevent excessive exposure to operating personnel.
d. All of the above.
50.
Which statement is correct concerning visualization when evaluating the
performance of air flow systems?
a. By generating visual "clouds," they can be observed to evaluate airflow
patterns and air velocities at exhaust entries and supply outlets.
b. It is a technique which can be employed to make a cursory estimate of the
performance of a local exhaust system.
c.
Visualization devices are best suited for the evaluation of airflow patterns and
velocities at exhaust entries and supply outlets.
d. All of the above.
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MD0165
4-38