Exam (elaborations)
Instrumentation & Controls- boma Questions and Answers 2024
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Instrumentation & Controls- boma
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Instrumentation & Controls- bomaWhat important function doesn't care receiver perform? - answerDissipate heat,
dampens compressor pulsation, Act as water and oil trap
On a compressed air system a safety valve would generally be installed on the -
answerAir receiver
Variable air volume system - answerTypically 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 - answer3PSIG
A ratio relay would be used to - answerControlled the sequence of actuators
when an actuated device is said to be normally open, that means the device is open
with - answerNo 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 - answer8 psig
When you are setting up an instrument, you should know all of the following except -
answerThe rate of flow of the control agent
Which of the following is an example of a controlled with readjusted set point -
answerSub master controller
In figure 1.5, the branch pressure from the temperature controller Increases in pressure
as the - answerControl variable decreases in temperature
The departure of the control point from the set point, or the amount of that departure is
described as - answerDeviation
The action of the control that increases its branch pressure As the control variable
increases - answerDirect acting
In figure 1.3 maximum heating will be at what branch pressure to the damper motor? -
answer13 psig
In figure 1.0, if the hot water control valve was N/O instead of N/C, What would the
control action be - answerDirect acting
, A 3 way mixing valve - answerHas two inlets and one comment outlet
What will be the typical range of a control sensor - answer4-20 mA
If you increase the percentage of proportional band on a receiver controller you would in
a effect - answerIncrease the psig/ fahrenheit output of the control
The temperature resistance characteristic of a thermistor is - answerNon-linear
A reasonable consumption of control air for a thermostat would be - answer30-40 scim
A static pressure regulator senses the pressure in the Plenum, the sensor that indicates
this pressure to the regulator is called - answerStatic tip
An instrumentation system is designed to - answerPerform a specific function in a
specific process
Which of the following centers have only two positions - answerDigital
The sensing element on a humidistat is set to be made of hygroscopic membrane. All of
the following materials are considered hygroscopic except - answerCarbon steel
Pneumatic control or takes air from the main at a_________Pressure and delivers it to
the actuator at a __________Pressure - answerConstant, variable
Current output produce________Signal distortion over long wire distances - answerLow
A three-way diverter valve - answerHas two outlets and one comment inlet
A normally closed pressure electric switch is made when - answerNo air is applied to its
bellows
In figure 1.4, the heating valve is piped - answerOn a full call for heating
The intensity of heat is expressed in terms of - answerDegrees Fahrenheit, degrees
Celsius (a or b)
Psychometry refers to the relationship between - answerTemperature, pressure and
moisture content of air
And advantage of a screw type compressor is that they - answerDeliver almost pulse
free flow
Which of the following is more advantages for transmission of signals - answerCurrent
signal
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