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The device used to maintain a constant pressure throughout apneumatic control system is called aa) reducing valveb) control regulatorc) pneumatic valved) balancing valvee) none of the above
a) reducing valve
Pneumatic controllers are divided into two basic classesa) direct and indirectb) off/on and proportionalc) positive and negative actiond) bleed and non-bleede) reset and gain
d) bleed and non-bleed
A pneumatic control systema) uses a sensing device to change pressures in the controllineb) requires an intermittent air supplyc) always uses pressure actuated final controlled devicesd) is not used to control air flow for ventilatione) is seldom used to control humidity
a) uses a sensing device to change pressure
In a non-bleed type controller the device that senses achange in room temperature is called aa) sensing valveb) bellowsc) set point gaged) temperature switche) feedback switch
b) Bellows
In a self-contained control system the energy for operationis provided bya) electricityb) air pressurec) the reaction of the sensing deviced) a bellowse) a bleed type nozzle
c) the reaction of the sensing device
Parallel blade dampers are usually used fora) changing the direction of the air flowb) varying the amount of air flowc) turning the air flow on or offd) proportional operatione) mixed air control (outside and inside air)
c) turning the air flow on or off
An example of final control device for a heating system is aa) slide-gateb) pumpc) fand) set of louverse) all of the above
e) all of the above
The most common type of damper operator is aa) slideb) rampc) bellowsd) pistone) pilot positioner
d) piston
An example of an auxiliary device for a pneumatic controlsystem would be aa) reducing valveb) three way air valvec) damperd) pumpe) bellows
b) three way air valve
A pneumatic relay can also be called aa) selector switchb) air reservoirc) bleed type controllerd) cumulatore) pneumatic-electric switch
d) cumulator
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