Instrumentation & Controls
BOMAQuestions And Answers
What important functions does an air receiver perform? -
7 7 7 7 7 7 7 7
correct answer...✔✔Dissipates heat,
7 7 7
Dampens compressor pulsations, 7 7
Act as water oil trap
7 7 7 7
On a compressed air system a safety valve would generally be installed on the? -
7 7 7 7 7 7 7 7 7 7 7 7 7 7
correct answer...✔✔Air receiver
7 7 7
Variable air volume system? - correct answer...✔✔Typically use VFDs to save energy
7 7 7 7 7 7 7 7 7 7 7
In figure 1.3, a full call for cooling would be at what branch pressure to the damper motor? -
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
7correct answer...✔✔3 psig 7 7
A ratio relay would be used to? - correct answer...✔✔Control the sequence of actuators
7 7 7 7 7 7 7 7 7 7 7 7 7
When an actuated device is said to be normally open, that means the device is open with? -
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
correct answer...✔✔No control pressure is applied
7 7 7 7 7 7
In figure 1.4, the hot water valve has an 8-12 psig spring range, the damper motor has a 3-
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
5 psig spring range. The calibration point of the thermostat is? - correct answer...✔✔
7 7 7 7 7 7 7 7 7 7 7 7 7
8 psig
7
When you are setting up an instrument, you should know all of the following except? -
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
correct answer...✔✔The rate of flow of the control agent
7 7 7 7 7 7 7 7 7
Which of the following is an example of a control with a readjusted set point? -
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
correct answer...✔✔Submaster controller
7 7 7
In figure 1.5, the branch pressure from the temperature controller increases the pressure a
7 7 7 7 7 7 7 7 7 7 7 7 7
s the? - correct answer...✔✔Controlled variable decreases in Temperature
7 7 7 7 7 7 7 7
The departure of the control point from the set point, or the amount of that departure is desc
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
ribe as ? - correct answer...✔✔Deviation
7 7 7 7 7
The action of a control that increases its branch pressure as the controlled variable increas
7 7 7 7 7 7 7 7 7 7 7 7 7 7
es? - correct answer...✔✔Direct acting
7 7 7 7
In figure 1.3 maximum heating would be at what branch pressure to the damper motor? -
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
7correct answer...✔✔13 psig 7 7
AGRADESOLUTIONS
, In figure 1.0, if the hot water control valve was N/O instead of N/C, what would the action be
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
? - correct answer...✔✔Direct acting
7 7 7 7
A three way mixing valve? - correct answer...✔✔Has two inlets and one common outlet
7 7 7 7 7 7 7 7 7 7 7 7 7
What will the typical range of a current sensor be? - correct answer...✔✔4-20 mA
7 7 7 7 7 7 7 7 7 7 7 7 7
In figure 1.4, with a loss of control branch pressure this system will fail on? -
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
7correct answer...✔✔Full cooling 7 7
If you decrease the percentage of proportional band on a receiver controller you would in af
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
fect? - correct answer...✔✔Increase the psi/ degree Fahrenheit output of the control
7 7 7 7 7 7 7 7 7 7 7
The temperature- resistance characteristics of a thermistor is? - correct answer...✔✔Non-
7 7 7 7 7 7 7 7 7 7
linear
A reasonable consumption of control air for a thermostat would be? - correct answer...✔✔
7 7 7 7 7 7 7 7 7 7 7 7 7
30-40 scim 7
A static pressure regulator senses the pressure in the plenum, the sensor that indicates thi
7 7 7 7 7 7 7 7 7 7 7 7 7 7
s pressure to the regulator is called? - correct answer...✔✔Static tip
7 7 7 7 7 7 7 7 7 7
An instrumentation system is designed to? - correct answer...✔✔
7 7 7 7 7 7 7 7
Perform a specific function in the specific process
7 7 7 7 7 7 7
If we lost control power in figure 1.2 the room temperature would ? - correct answer...✔✔
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
Fall/ decrease in temperature
7 7 7
Which of the following sensors have only two points? - correct answer...✔✔Digital
7 7 7 7 7 7 7 7 7 7 7
On or off 7 7
The sensing element on a humidstat is said to be made on hygroscopic membrane. All of th
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
e following materials are considered hygroscopic except? - correct answer...✔✔
7 7 7 7 7 7 7 7 7
Carbon steel 7
A pneumatic controller takes air from the main at a ________ pressure and delivers it to the
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
actuator at a ____ pressure: - correct answer...✔✔Constant, variable
7 7 7 7 7 7 7 7 7
Current outputs produce ______ signal distortion over long wire distances. -
7 7 7 7 7 7 7 7 7 7
correct answer...✔✔Low
7 7
A three-way diverting valve? - correct answer...✔✔Has to outlets and one common inlet
7 7 7 7 7 7 7 7 7 7 7 7
AGRADESOLUTIONS
BOMAQuestions And Answers
What important functions does an air receiver perform? -
7 7 7 7 7 7 7 7
correct answer...✔✔Dissipates heat,
7 7 7
Dampens compressor pulsations, 7 7
Act as water oil trap
7 7 7 7
On a compressed air system a safety valve would generally be installed on the? -
7 7 7 7 7 7 7 7 7 7 7 7 7 7
correct answer...✔✔Air receiver
7 7 7
Variable air volume system? - correct answer...✔✔Typically use VFDs to save energy
7 7 7 7 7 7 7 7 7 7 7
In figure 1.3, a full call for cooling would be at what branch pressure to the damper motor? -
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
7correct answer...✔✔3 psig 7 7
A ratio relay would be used to? - correct answer...✔✔Control the sequence of actuators
7 7 7 7 7 7 7 7 7 7 7 7 7
When an actuated device is said to be normally open, that means the device is open with? -
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
correct answer...✔✔No control pressure is applied
7 7 7 7 7 7
In figure 1.4, the hot water valve has an 8-12 psig spring range, the damper motor has a 3-
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
5 psig spring range. The calibration point of the thermostat is? - correct answer...✔✔
7 7 7 7 7 7 7 7 7 7 7 7 7
8 psig
7
When you are setting up an instrument, you should know all of the following except? -
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
correct answer...✔✔The rate of flow of the control agent
7 7 7 7 7 7 7 7 7
Which of the following is an example of a control with a readjusted set point? -
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
correct answer...✔✔Submaster controller
7 7 7
In figure 1.5, the branch pressure from the temperature controller increases the pressure a
7 7 7 7 7 7 7 7 7 7 7 7 7
s the? - correct answer...✔✔Controlled variable decreases in Temperature
7 7 7 7 7 7 7 7
The departure of the control point from the set point, or the amount of that departure is desc
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
ribe as ? - correct answer...✔✔Deviation
7 7 7 7 7
The action of a control that increases its branch pressure as the controlled variable increas
7 7 7 7 7 7 7 7 7 7 7 7 7 7
es? - correct answer...✔✔Direct acting
7 7 7 7
In figure 1.3 maximum heating would be at what branch pressure to the damper motor? -
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
7correct answer...✔✔13 psig 7 7
AGRADESOLUTIONS
, In figure 1.0, if the hot water control valve was N/O instead of N/C, what would the action be
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
? - correct answer...✔✔Direct acting
7 7 7 7
A three way mixing valve? - correct answer...✔✔Has two inlets and one common outlet
7 7 7 7 7 7 7 7 7 7 7 7 7
What will the typical range of a current sensor be? - correct answer...✔✔4-20 mA
7 7 7 7 7 7 7 7 7 7 7 7 7
In figure 1.4, with a loss of control branch pressure this system will fail on? -
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
7correct answer...✔✔Full cooling 7 7
If you decrease the percentage of proportional band on a receiver controller you would in af
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
fect? - correct answer...✔✔Increase the psi/ degree Fahrenheit output of the control
7 7 7 7 7 7 7 7 7 7 7
The temperature- resistance characteristics of a thermistor is? - correct answer...✔✔Non-
7 7 7 7 7 7 7 7 7 7
linear
A reasonable consumption of control air for a thermostat would be? - correct answer...✔✔
7 7 7 7 7 7 7 7 7 7 7 7 7
30-40 scim 7
A static pressure regulator senses the pressure in the plenum, the sensor that indicates thi
7 7 7 7 7 7 7 7 7 7 7 7 7 7
s pressure to the regulator is called? - correct answer...✔✔Static tip
7 7 7 7 7 7 7 7 7 7
An instrumentation system is designed to? - correct answer...✔✔
7 7 7 7 7 7 7 7
Perform a specific function in the specific process
7 7 7 7 7 7 7
If we lost control power in figure 1.2 the room temperature would ? - correct answer...✔✔
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
Fall/ decrease in temperature
7 7 7
Which of the following sensors have only two points? - correct answer...✔✔Digital
7 7 7 7 7 7 7 7 7 7 7
On or off 7 7
The sensing element on a humidstat is said to be made on hygroscopic membrane. All of th
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
e following materials are considered hygroscopic except? - correct answer...✔✔
7 7 7 7 7 7 7 7 7
Carbon steel 7
A pneumatic controller takes air from the main at a ________ pressure and delivers it to the
7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
actuator at a ____ pressure: - correct answer...✔✔Constant, variable
7 7 7 7 7 7 7 7 7
Current outputs produce ______ signal distortion over long wire distances. -
7 7 7 7 7 7 7 7 7 7
correct answer...✔✔Low
7 7
A three-way diverting valve? - correct answer...✔✔Has to outlets and one common inlet
7 7 7 7 7 7 7 7 7 7 7 7
AGRADESOLUTIONS
