HVAC Final Exam Complete Questions
WITH Answers
\Q\.When a water regulating valve is used to control the head pressure of a water-cooled
system, the valve's spring is acting against which pressure to modulate the water flow? -
ANSWERS✔-Head pressure of the system
\Q\.To prove that the combustion blower motor is operating before ignition, a ______ would be
used. - ANSWERS✔-Sail switch
\Q\.The difference between system overshoot and system lag is called? - ANSWERS✔-
Temperature swing
\Q\.The purpose of a heat anticipator is to_____. - ANSWERS✔-Reduce the temperature swing
of a conditioned space
\Q\.To control ice build-up on a heat pump outdoor coil in the heating cycle, a ____ is attached
to a large diaphragm. - ANSWERS✔-Microswitch
\Q\.A low pressure control has a "high event" and a "differential" setting. The technician wants
the system to turn on at 28 psig and shut down at 2 psig. What would be the proper settings? -
ANSWERS✔-High event: 28 psig, differential: 26 psig
\Q\.Line voltage thermostats have heavier and use which type of sensing element? -
ANSWERS✔-all of the above
WITH Answers
\Q\.When a water regulating valve is used to control the head pressure of a water-cooled
system, the valve's spring is acting against which pressure to modulate the water flow? -
ANSWERS✔-Head pressure of the system
\Q\.To prove that the combustion blower motor is operating before ignition, a ______ would be
used. - ANSWERS✔-Sail switch
\Q\.The difference between system overshoot and system lag is called? - ANSWERS✔-
Temperature swing
\Q\.The purpose of a heat anticipator is to_____. - ANSWERS✔-Reduce the temperature swing
of a conditioned space
\Q\.To control ice build-up on a heat pump outdoor coil in the heating cycle, a ____ is attached
to a large diaphragm. - ANSWERS✔-Microswitch
\Q\.A low pressure control has a "high event" and a "differential" setting. The technician wants
the system to turn on at 28 psig and shut down at 2 psig. What would be the proper settings? -
ANSWERS✔-High event: 28 psig, differential: 26 psig
\Q\.Line voltage thermostats have heavier and use which type of sensing element? -
ANSWERS✔-all of the above
