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Instrumentation & Controls BOMA Pre-Quiz -Answered 2024
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Instrumentation & Controls BOMA Pre-Quiz -Answered 2024
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Instrumentation & Controls BOMA Pre-Quiz -Answered 2024
________ is the number of positions an actuator will assume when the control signal is
slowly changed 0-100% - ANSWER-Resolution
A ________ is a device used to measure relative humidity. - ANSWER-Hygrometer
A ________ is installed in a compressed air system to deliver constant and reduced
pressure to components in the system. - ANSWER-Pressure regulator
A common air pressure applied to the supply of a pneumatic controller is? - ANSWER-
18 psig
A diverting switch is used to ? - ANSWER-Manually change air line connections
A heating thermostat closes on? - ANSWER-Temperature drop
A minimum code required for compressed air receiver would be? - ANSWER-Vessel
must have a pressure gauge,
Vessel must have a safety valve,
Vessel must have a bottom drain
Vessel must have a,b and c
A normally closed pressure electric switch is made when? - ANSWER-No air is applied
to its bellows
A pitot tune is used to traverse a duct. You've measured total pressure and static
pressure. How do you solve for velocity pressure? - ANSWER-Total pressure minus
static pressure
A pneumatic controller takes air from the main at a ________ pressure and delivers it to
the actuator at a ____ pressure: - ANSWER-Constant, variable
A ratio relay would be used to? - ANSWER-Control the sequence of actuators
A reasonable consumption of control air for a thermostat would be? - ANSWER-30-40
scim
A refrigerated air dryer installed downstream of a compressor _________? - ANSWER-
Cools the air below the dew point
, A relative humidity transmitter is fitted with analog gauge that reads directly in
percentage relative humidity. The relative humidity range from 0-100%, what
percentage would be indicated with an output pressure of 12 psig? - ANSWER-75%
A single pipe thermostat must be used in conjunction with a ? - ANSWER-Restrictor
A static pressure regulator senses the pressure in the plenum, the sensor that indicates
this pressure to the regulator is called? - ANSWER-Static tip
A static pressure transmitter has a range of 0-6inches of water. What pneumatic
equivalent (output pressure) would you expect to find at 4.5 inches of water? -
ANSWER-12 psig
A thermowell for a liquid thermometer? - ANSWER-Protects the the thermometer from
damage
A three way mixing valve? - ANSWER-Has two inlets and one common outlet
A three-way diverting valve? - ANSWER-Has to outlets and one common inlet
Actuators modulate from a full open to fully closed position as changes occur at the
controller is an example of? - ANSWER-Proportional control
An advantage of screw type compressors is that they? - ANSWER-Deliver almost pulse-
free flow
An anemometer is used to measure? - ANSWER-Air velocity
An instrument system that uses feedback from a process to correct changes is an? -
ANSWER-Closed-loop
An instrumentation system is designed to? - ANSWER-Perform a specific function in the
specific process
An instruments ability to indicate or record the actual valve of a measured quantity is? -
ANSWER-Accuracy
Assume the standard 3-15 psig range. The sensitivity of 50-100 degrees Fahrenheit
transmitter would be? - ANSWER-0.24 psig/degrees Fahrenheit
Cold plenum are generally controlled at? - ANSWER-55 degrees Fahrenheit
Compressed air for pneumatic instrumentation requires micronic filtration. A micron is? -
ANSWER-Approximately one, one thousandth of a millimeter in size
Compressors are most efficient when the intake air is? - ANSWER-Cool
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