Pneumatics Flashcards

1
Q

Which of the following is not an advantage of using pneumatic controls?

A : simple operation
B : flexible application
C : Built in safety
D : Unreliable service

A

D: unreliable service

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2
Q

On an uncontrolled open loop system which of the following statements is true?

A : saves energy
B : wastes energy
C : occupant is comfortable
D : temperature is automatically controlled.

A

B: Wastes Energy

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3
Q

What devices are needed to have an automatic closed loop system as applied to a control system?

A : Plug, seat and spring
B: Controller, control device and process
C : Tubing, fittings and hangers
D : Air compressor, prv and air dryer

A

B: Controller, control device and process

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4
Q

The device that delivers a constant air supply to a pneumatic system is called?

A: relief valve
B: Automatic drain valve
C: control valve
D Pressure regulating valve

A

D: Pressure regulating valve

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5
Q

What are three qualities that compressed air must have if it is to be used to operate pneumatic controls?

A

Clean, Dry, and oil free

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6
Q

What weight of oil should always be used in a temperature control air compressor?

A

20 or 30 weight non-detergent oil.

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7
Q

What is the source of energy for a pneumatic control system?

A

Compressed Air

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8
Q

What is the purpose of a safety relief valve in a pneumatic control system?

A

Prevents main air supply from exceeding a preset safety limit.

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9
Q

When air is removed from a controlled device, what drives the device to its normal position?

A

Spring

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10
Q

What is the temperature range of a -40 degree to 160 degree transmitter?

A

200 degrees

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11
Q

What is the constant supply pressure delivered to a pneumatic control system?

A

13-25 psi

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12
Q

What is the pneumatic span of a transmitter regardless of the manufacturer?

A

3-15 psi

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13
Q

What is an example of a control device?

A: Control valve
B: Thermostat
C: Humidistat
D: relay

A

A: Control Valve

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14
Q

What is an example of a process?

A: Control Valve
B: Dehumidification
C: thermostat
D: humidistat

A

B: Dehumidification

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15
Q

What is an example of a controller?

A: Control valve
B: damper actuator
C: pe relay
D: thermostat

A

D: thermostat

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16
Q

What is the device called that is installed with preheat coils subjected to freezing temperatures?

A

Safety low limit

17
Q

What is the operation of modulating outside air, return air and exhaust dampers?

A

Mixed air control

18
Q

When using an external restrictor, a transmitter should be located not more than how many feet from the receiver controller?

19
Q

On a dual input receiver controller that is controlling a hot water system, the hot water is being reset from outside air temperature, what is the adjustment of the reset called?

20
Q

What type of transmitter should be used in a mixed air plenum?

A

Capillary tube

21
Q

What activates a pneumatic- electric relay?

A

Pneumatic signal

22
Q

What activates an electronic- pneumatic relay?

A

Electricity

23
Q

A direct acting thermostat would control a?

A

Normally open hot water control valve

24
Q

A reverse acting humidistat would control a:

A

Normally closed steam humidity valve

25
What is the term used to describe an air handling unit that is using outside air for cooling below 75 degrees outside air temperature?
Economizer/ free cooling control