On a compressed air system a safety valve What important function doesn't care receiver perform? - ANSWER Dissipate heat, dampens compressor pulsation, Act as water and oil trap
would generally be installed on the - ANSWER Air receiver
Variable air volume system - ANSWER Typically use the VFD...
Instrumentation & Controls/ boma|| 110
QUESTIONS|| CORRECT ANSWERS||
VERIFIED
What important function doesn't care receiver perform? - ANSWER Dissipate heat, dampens compressor
pulsation, 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 the VFD's to save energy
In figure 1.3, a fool call for cooling would be at what branch pressure to the damper motor - ANSWER
3PSIG
A ratio relay would be used to - ANSWER Controlled 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 a 8 to 12 psig spring range, The damper motor has a 3 to 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 controlled with readjusted set point - ANSWER Sub master
controller
, In figure 1.5, the branch pressure from the temperature controller Increases in pressure as the - ANSWER
Control 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 the control that increases its branch pressure As the control variable increases - ANSWER
Direct acting
In figure 1.3 maximum heating will be at what branch pressure to the damper motor? - ANSWER 13 psig
In figure 1.0, if the hot water control valve was N/O instead of N/C, What would the control action be -
ANSWER Direct acting
A 3 way mixing valve - ANSWER Has two inlets and one comment outlet
What will be the typical range of a control sensor - ANSWER 4-20 mA
If you increase the percentage of proportional band on a receiver controller you would in a effect -
ANSWER Increase the psig/ fahrenheit output of the control
The temperature resistance characteristic of a thermistor is - ANSWER Non-linear
A reasonable consumption of control air for a thermostat would be - ANSWER 30-40 scim
A static pressure regulator senses the pressure in the Plenum, the sensor that indicates this pressure to
the regulator is called - ANSWER Static tip
An instrumentation system is designed to - ANSWER Perform a specific function in a specific process
Which of the following centers have only two positions - ANSWER Digital
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