Which of the following is an incorrect statement regarding air system fittings and transitions?
a. Their pressure loss is greater than that of a given length of the same size straight duct.
b. They can be used to change the direction of airflow in a duct system.
c. They have the same pressure loss per foot as the same size of straight duct.
d. They can be used to change the velocity of airflow in an air duct system.
[Ques. 2] When a change in the volume of airflow is known, Fan Law 1 can be used to calculate the _____.
a. new value for rpm
b. new value to static pressure
c. new value for horsepower
d. old value for cfm
[Ques. 3] The lowest pressure level in an air distribution system is found at the _____.
a. conditioned space
b. return duct inlet
c. blower inlet
d. blower outlet
[Ques. 4] Air systems used only for heating generally require _____.
a. more airflow than systems used for cooling
b. less airflow than systems used for cooling
c. the same airflow as a system used for cooling
d. twice the airflow of a system used for cooling
[Ques. 5] At sea level, the air pressure applied to every square inch of Earth's surface is _____.
a. 0 psia
b. 14.7 psia
c. 27.68 psia
d. 14.7 psig
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