Technician A says that an idle air control valve controls the airflow past closed throttle plates. Technician B says that the idle air control valve is usually controlled by a stepper motor. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
C
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Find the area of the template in the figure. All dimensions are in inches. Round the answer, in square inches, to the nearest tenth.
Hot-water heating systems operate at or around _____.
a. ambient temperature b. 110–150°F c. 170–190°F d. 200–225°F
?Why must some castings be repaired without pre- and post-heating?
A. ?They are large or have to be repaired in place. B. ?They are made of a type of cast iron that cannot be preheated because it is too soft. C. ?It would damage the paint job on the part. D. ?Cast iron repairs always require pre- and post-heating.
When is a forward curved centrifugal blower motor most likely to draw high amps?
A) when the airflow to the blower is restricted B) when the airflow leaving the blower is restricted C) when the motor RPM is set lower than the manufacturer's specifications D) when there is no restriction to the airflow in or out of the blower