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A device used to position dampers and control valves istermed
a) a controller
b) a relay
c) a transformer
d) an actuator
e) a temperature controller
Thermostats may be classified according to their
a) application
b) type of temperature sensing element
c) type of control action provided
d) temperature range
e) all of the above
On-off thermostats are equipped with:
a) an open contact switch
b) a high temperature switch
c) a low temperature switch
d) a high voltage switch
e) a low voltage switch
A bimetal thermostat's operating range is between:
a) 5 and 40 degrees C
b) 0 and 50 degrees C
c) 0 and 40 degrees C
d) 10 and 32 degrees C
e) 50 and 90 degrees C
A room thermostat should be mounted on an inside wall about:
a) 0.5 m above the floor
b) 0.75 m above the floor
c) 1.0 m above the floor
d) 1.25 m above the floor
e) 1.5 m above the floor
Pressure controllers can be divided into two classes:
a) high and low temperature
b) high and low pressure
c) high and low flow
d) inside and outside mounting
An example of a controlled device would be:
a) a damper motor operating air louvers
b) a hot water boiler
c) a radiator
d) a steam boiler
e) a thermostat
a) a damper motor operating air louvres
Control motors are divided into two classifications:
a) large and small
b) AC and DC
c) valve operators and damper operators
d) high voltage and low voltage
e) pump and fan controllers
In a basic electrical control system the device that senses adrop in air temperature is called the:
a) final controlled device
b) pneumatic temperature sensor
c) humidistat
d) thermostat
e) regulator
In a basic electric control system an example of a controlled device is:
a) a fuel valve
b) a louver
c) a diverter valve
d) an electric switch
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