CONTROLLERS -1- A controller, with its sensing mechanism, senses the controlled condition directly. True False -2- Normally a controller has an averaging sensing element when sensing the mixed air. True False -3- If a gas or fluid filled sensing element is broken, the controller will believe the temperature suddenly increased. True False -4- Sensitivity and throttling range are the same. They relate to the relationship of the output pressure change relative to a specific temperature change. (example: 5#/F°) True False -5- Normally the slower the controlled condition potentially changes, the higher the sensitivity (lower the throttling range) (lower the proportional band) on the controller. True False -6- A controller acting as a mixed air low limit typically has a set point of 55°F to 60°F. True False -7- The sensitivity is not normally adjustable on controllers. True False -8- Throttling range is the amount of the sensed variable change required to stroke the controlled device from fully open to fully closed. True False -9- A single controller can be used to satisfy only one function in a control circuit. True False RECEIVER CONTROLLERS AND TRANSMITTERS -1- Transmitters do not normally control anything, they just sense and report the condition to receiver controllers and indication gauges. True False -2- Receiver controllers may have as many as five connection ports. True False -3- The majority of SIEMENS, TAC, Johnson Controls and Honeywell transmitters are two pipe instruments. True False -4- The indicating pressure range of transmitters is normally 5 PSIG to 18 PSIG. True False 10-180
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