Instrumentation & Controls/ boma
UPDATED ACTUAL Exam Questions and
CORRECT Answers
What important function doesn't care receiver perform? - CORRECT 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 - CORRECT
ANSWER - Air receiver
Variable air volume system - CORRECT 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 -
CORRECT ANSWER - 3PSIG
A ratio relay would be used to - CORRECT ANSWER - Controlled the sequence of
actuators
when an actuated device is said to be normally open, that means the device is open with -
CORRECT 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 - CORRECT ANSWER -8
psig
When you are setting up an instrument, you should know all of the following except -
CORRECT ANSWER - The rate of flow of the control agent
Which of the following is an example of a controlled with readjusted set point - CORRECT
ANSWER - Sub master controller
, In figure 1.5, the branch pressure from the temperature controller Increases in pressure as the -
CORRECT 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 - CORRECT ANSWER - Deviation
The action of the control that increases its branch pressure As the control variable increases -
CORRECT ANSWER - Direct acting
In figure 1.3 maximum heating will be at what branch pressure to the damper motor? -
CORRECT 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 - CORRECT ANSWER - Direct acting
A 3 way mixing valve - CORRECT ANSWER - Has two inlets and one comment outlet
What will be the typical range of a control sensor - CORRECT ANSWER - 4-20 mA
If you increase the percentage of proportional band on a receiver controller you would in a effect
- CORRECT ANSWER - Increase the psig/ fahrenheit output of the control
The temperature resistance characteristic of a thermistor is - CORRECT ANSWER - Non-
linear
A reasonable consumption of control air for a thermostat would be - CORRECT
ANSWER - 30-40 scim
UPDATED ACTUAL Exam Questions and
CORRECT Answers
What important function doesn't care receiver perform? - CORRECT 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 - CORRECT
ANSWER - Air receiver
Variable air volume system - CORRECT 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 -
CORRECT ANSWER - 3PSIG
A ratio relay would be used to - CORRECT ANSWER - Controlled the sequence of
actuators
when an actuated device is said to be normally open, that means the device is open with -
CORRECT 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 - CORRECT ANSWER -8
psig
When you are setting up an instrument, you should know all of the following except -
CORRECT ANSWER - The rate of flow of the control agent
Which of the following is an example of a controlled with readjusted set point - CORRECT
ANSWER - Sub master controller
, In figure 1.5, the branch pressure from the temperature controller Increases in pressure as the -
CORRECT 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 - CORRECT ANSWER - Deviation
The action of the control that increases its branch pressure As the control variable increases -
CORRECT ANSWER - Direct acting
In figure 1.3 maximum heating will be at what branch pressure to the damper motor? -
CORRECT 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 - CORRECT ANSWER - Direct acting
A 3 way mixing valve - CORRECT ANSWER - Has two inlets and one comment outlet
What will be the typical range of a control sensor - CORRECT ANSWER - 4-20 mA
If you increase the percentage of proportional band on a receiver controller you would in a effect
- CORRECT ANSWER - Increase the psig/ fahrenheit output of the control
The temperature resistance characteristic of a thermistor is - CORRECT ANSWER - Non-
linear
A reasonable consumption of control air for a thermostat would be - CORRECT
ANSWER - 30-40 scim
