Chapter 107

Question 0

A pneumatic control system:
A) uses a sensing device to change pressures in the control line
B) requires an intermittent air supply
C) always uses pressure actuated final controlled devices
D) is not used to control air flow for ventilation

Answer 0

A) uses a sensing device to change pressures in the control line

Question 1

The most common type of damper operator is a:
A) parallel blade
B) piston
C) knife blade
D) electric-magnetic switch

Answer 1

B) piston

Question 2

A pneumatic relay can also be called a:
A) thermo-hydraulic controller
B) pop valve
C) cumulator
D) nozzle

Answer 2

C) cumulator

Question 3

A pneumatic control system consists of:
A) thermostats and humidistats
B) air piping and tubing
C) an air compressor system
D) all of the above

Answer 3

D) all of the above

Question 4

When the control pressure in a pneumatic controller is either at maximum or minimum without any intermediate steps, the control is:
A) proportional
B) on-off
C) proportional plus reset
D) proportional plus rate

Answer 4

B) on-off

Question 5

The piston is sealed to avoid air leakage in a piston type damper operator by using:
A) highly machined surfaces
B) composite "O" rings
C) rolling diaphragm
D) carbon rings

Answer 5

C) rolling diaphragm