[D2L] 104A Intro to Controls Flashcards

1
Q

What are the sub-components all types of controllers in a closed-loop control system?

1) a sensor
2) a comparator or null detector
3) a transmitter
4) all of the above

A

All of the above

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2
Q

What type of temperature controller is used in a typical residential household?

A

Thermostat

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3
Q

What are the main type of sensors used in the HVAC/R industry?

1) temperature
2) pressure
3) humidity
4) all of the above

A

all of the above

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4
Q

Where would you find an averaging element?

A

Across the face of a heating coil

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5
Q

where is the best place to mount a fast response element with regards to off cycle defrost?

A

evaporator

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6
Q

What sensor uses a thin flexible membrane that stretches across the mouth of a bell shaped container?

A

flexible diaphragm

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7
Q

What sensors react to pressure?

1) diaphragm
2) bellows
3) bourdon tube
4) all of the above

A

All of the above

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8
Q

What type of loop control is turning on a light in bedroom?

A

open loop

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9
Q

Open loop controls are automatic

A

False. They are manual
close loop is automatic

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10
Q

Thermostat Terminal

A

R - Main Power(24v)
G - Fan on/off (green)
Y - Cooling (blue)
W - Heat (black)
C - Common (white)

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11
Q

Closed loop controls are automatic

A

True

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12
Q

A motion sensor controlling a light in a room is an example of closed loop

A

True

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13
Q

What is the control agent in a residential furnace?

A

natural gas

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14
Q

If the thermostat is calling for cooling and you read 24v between R and Y which component is running?

A

Nothing

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15
Q

If 0v is measured between R and Y what components should be running?

1) Indoor Blower
2) Air conditioning
3) Heating
4) A & B

A

A & B

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