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BOMA-Instrumentation & Controls with Complete Solutions
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BOMA-Instrumentation & Controls with Complete Solutions
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BOMA-Instrumentation & Controls withComplete Solutions
A 3" diameter diaphragm has 20 PSIG acting upon it. The force expected would be
_____. - ANSWER-141 inch pounds
A combination starter is a switch for disconnecting and a starter mounted and one
enclosure. - ANSWER-True
A compensated control is best described as a control with a readjusted control/set point.
An example of a compensated control is _____. - ANSWER-Submaster thermostat
A decrease in percentage of proportional band/throttling range would increase the
sensitivity of the instrument. - ANSWER-True
A hygroscopic material is described as material that is able to absorb or condense
moisture from the atmosphere. - ANSWER-True
A master thermostat develops a specific branch pressure, equivalent to a measured
temperature. A device that works on this principle is a _____. - ANSWER-Temperature
transmitter
A motor control circuit that is designed so that it must be restarted by pushing a start
button after a power interruption is a _____. - ANSWER-3 wire control
A P.E. Switch is used to change an electrical signal to a pneumatic output. - ANSWER-
False
A static pressure regulator senses the pressure in the plenum the regulator controls.
The sensor that indicates this pressure to this regulator is called a_____? - ANSWER-
Static tip
A static pressure transmitter has a range of 0-3 inches of water. What pneumatic
equivalent (output pressure) would you expect to find at 1.5 inches of water? -
ANSWER-9 PSIG
A submaster controller resets the set point of the master controller. - ANSWER-False
A What pressure spring would be in this motors? - ANSWER-10 PSIG
Accuracy: - ANSWER-An instrument's ability to indicate or record the actual value of a
measured quantity.
, Capacity index: - ANSWER-Quantity of water at 60 degrees Fahrenheit that flows
through a given valve with a pressure drop of 1 PSIG. Sometimes called flow
coefficient.
Compressor motor: - ANSWER-
Compressor relay: - ANSWER-
Condenser fan motor: - ANSWER-
Contactor coil 1 pulls in an electric strip heater on a cold air duct to a room. The
pneumatic room thermostat operates PS1. The thermostat action is what control action?
- ANSWER-Reverse
Could the absorption of moisture from humid air, people, wood, paper, cloth and other
hygroscopic materials increase the sensible heat/temperature of a room? - ANSWER-
Yes
Damper motors are manufactured in a number of spring ranges. Probably the most
common is a _____ to _____ PSIG range. - ANSWER-3 to 13 PSIG
Determine the sensitivity of the control (PSIG/Fahrenheit) by the information given. 3-15
PSIG (pressure span) 78-90 degrees Fahrenheit (temperature span). - ANSWER-?
Deviation: - ANSWER-Departure of the control point from the set point of the amount of
that departure.
Dew Point: - ANSWER-The temperature at which dew forms or condensation or vapor
occurs.
Direct Acting: - ANSWER-The action of a controller that increases its branch line
pressure as the controlled variable increases.
Feedback: - ANSWER-Pressure developed by the flow of speed of the air impacting
upon a probe.
Full load amperage of the motor is the same as starting current. - ANSWER-False
H.O.A. switch: - ANSWER-
High pressure switch: - ANSWER-
If the ambient temperature increased and the bimetal warped toward the nozzle (down),
the control action would be _____? - ANSWER-Direct action
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