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BOMA - Instrumentation & Controls|| 100 QUESTIONS|| CORRECT ANSWERS
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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...

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  • November 3, 2024
  • 9
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • boma instrumentation controls 100 questions
  • boma instrumentation controls
  • what important functions does an air receiver pe
  • on a compressed air system a safety valve would ge

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  • BOMA - Instrumentation & Controls
  • BOMA - Instrumentation & Controls

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BOMA - Instrumentation & Controls|| 100
QUESTIONS|| CORRECT ANSWERS

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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