Pneumatic Controls For Heating Systems

Front 1

The device used to maintain a constant pressure throughout a pneumatic control system is called a
a) reducing valve
b) control regulator
c) pneumatic valve
d) balancing valve
e) none of the above

Back 1

A

Front 2

Pneumatic controllers are divided into two basic classes
a) direct and indirect
b) off/on and proportional
c) positive and negative action
d) bleed and non-bleed
e) reset and gain

Back 2

D

Front 3

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
e) is seldom used to control humidity

Back 3

A

Front 4

In a non-bleed type controller the device that senses a change in room temperature is called a
a) sensing valve
b) bellows
c) set point gage
d) temperature switch
e) feedback switch

Back 4

B

Front 5

In a self-contained control system the energy for operation is provided by
a) electricity
b) air pressure
c) the reaction of the sensing device
d) a bellows
e) a bleed type nozzle

Back 5

C

Front 6

Parallel blade dampers are usually used for
a) changing the direction of the air flow
b) varying the amount of air flow
c) turning the air flow on or off
d) proportional operation
e) mixed air control (outside and inside
air)

Back 6

C

Front 7

An example of final control device for a heating system is a
a) slide-gate
b) pump
c) fan
d) set of louvers
e) all of the above

Back 7

E

Front 8

The most common type of damper operator is a
a) slide
b) ramp
c) bellows
d) piston
e) pilot positioner

Back 8

D

Front 9

An example of an auxiliary device for a pneumatic control system would be a
a) reducing valve
b) three way air valve
c) damper
d) pump
e) bellows

Back 9

B

Front 10

A pneumatic relay can also be called a
a) selector switch
b) air reservoir
c) bleed type controller
d) cumulator
e) pneumatic-electric switch

Back 10

D