What important function(s) does an air receiver perform? - ANSWER Dissipates heat, Dampens compressor pulsations, Act as water and oil trap
On a compressed air system a safety valve would generally be installed on the: - ANSWER Air receiver
Variable air volume system: - ANSWER Typically use V...
What important function(s) does an air receiver perform? - ANSWER Dissipates heat, Dampens
compressor pulsations, Act as water and oil trap
On a compressed air system a safety valve would generally be installed on the: - ANSWER Air receiver
Variable air volume system: - ANSWER Typically use VFDs to save energy
In figure 1.3, a full call for cooling would be at what branch pressure to the damper motor? - ANSWER 3
psig
A ratio relay would be used to. - ANSWER Control the sequence of actuators.
When an actuated device is said to be normally open, that means the device is open with: - ANSWER No
control pressure is applied
In figure 1.4, the hot water valve has an 8-12 psig spring range, the damper motor has a 3-8 psig spring
range. The calibration point of the thermostat is: - ANSWER 8 psig
When you are setting up an instrument, you should know all of the following except: - ANSWER The rate
of flow of the control agent
Which of the following is an example of a control with a readjusted set point: - ANSWER Submaster
controller
In figure 1.5, the branch pressure from the temperature controller increases in pressure as the: -
ANSWER Controlled variable decreases in temperature
, The departure of the control point from the set point, or the amount of that departure is described as: -
ANSWER Deviation
The action of a control that increase its branch pressure as the controlled variable increases: - ANSWER
Direct acting
The sensing element on a humidstat is said to be made on a hygroscopic membrane. All of the following
materials are considered hygroscopic except: - ANSWER Carbon Steel
A pneumatic controller takes air from the main at a ________ pressure and delivers it to the actuator at
a _________ pressure: - ANSWER Constant, variable
Current outputs produce _____ signal distortion over long wire distances. - ANSWER Low
A three-way diverting valve: - ANSWER Has two outlets and one common inlet
A normally closed pressure electric switch is made when: - ANSWER
In figure 1.4, the heating valve is piped: - ANSWER Normally closed
The intensity of heat is expressed in terms of: - ANSWER Degrees Fahrenheit, Degrees Fahrenheit
Psychrometry refers to the relationship between: - ANSWER Temperature, pressure and moisture
content of air
An advantage of screw type compressors is that they: - ANSWER Deliver almost pulse-free flow
Which of the following is more advantageous for transmission of signals: - ANSWER Current signal
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