CONTROL QUIZ The underlined answer is correct. PNEUMATIC THERMOSTATS -1- In a reheating application you may find a reverse acting thermostat controlling a normally closed valve. True False -2- Two pipe relay thermostats usually are capable of passing a greater volume of compressed air than a one pipe thermostat. True False -3- Day/night and summer/winter thermostats alter modes via a change in main air pressure. True False -4- There are several different pressure combinations used for day/night and summer/winter changeover in the industry. True False -5- Relay type thermostats bleed a small amount of compressed air most of the time. True False -6- Two thermostats are required to control a room with a VAV box and a heating coil. True False -7- If the flapper nozzle (leak port) is plugged on a direct acting thermostat, controlling a normally open heating valve, the room likely will over-heat. True False -8- If an operator accidentally bends the bimetal away from the flapper nozzle (leak port) on a direct acting thermostat, controlling a normally closed cooling valve, the room will likely over-heat. True False -9- The sensitivity of a thermostat is the relationship of temperature change to output signal (branch signal) change. True False -10- The sensitivity can be changed on most thermostats, but recalibration is required after that adjustment. True False -11- If the main air and branch signal connections are reversed, the thermostat typically makes an air hissing noise. True False -12- If the main air and branch signal connections are reversed the thermostat will still control, but a little slower to react. True False 10-177
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