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Years 2 Test 3 > Review > Flashcards

Review Flashcards

1
Q

An energized conductor (Hot Lead) in an operating light circuit that had its switch in the ON position will have the following characteristics at the LINE side of the switch

A

C. Voltage and Current

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2
Q

A neutral conductor in an operating lighting circuit that has its switch in the ON position will have the following characteristics

A

D. Current but no Voltage

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3
Q

An energized conductor (hot lead) in an operating lighting circuit has its switch in the OFF position will have the following characteristics at the LINE side of the switch

A

B. Voltage but no current

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4
Q

When testing for voltage in any motor starter panel, the first thing you do with the multimeter is

A

C. Preform a continuity test on the meter leads

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5
Q

When testing for voltage in an isolated control transformer you can test the secondary hot lead

A

B. To the transformers neutral

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6
Q

In a 480 volt, 3 phase, 60 amp motor starting with a multimeter, what should each LEG TO GROUND read

A

277 volts (480/1.73=277)

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7
Q

In a 208 volt, 3 phase, 60 amp motor starter with a multimeter, what should each LEG TO GROUND read

A

D. 120 volts

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8
Q

In a 480 volt, 3 phase, 60 amp motor starter with a multimeter what should each LEG TO LEG read

A

A. 480 volts

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9
Q

In a 208 volt, 3 phase, 60 amp motor starter with a multimeter, what should each LEG TO LEG read

A

208 volts

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10
Q

____ is the amount of moisture in the air compared to the amount of moisture it could hold if it were saturated

A

B. Dewpoint

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11
Q

____ is the sum of sensible heat and latent heat

A

C. Enthalpy

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12
Q

Measuring current in an operating circuit with the multimeters test leads requires you to

A

C. Break the circuit and place the meter in series

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13
Q

The safest way way to accurately test the current in a circuit is to

A

D. Use a clamp meter and test

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14
Q

When testing for voltage on a bonded control transformer you can test the secondary hot lead

A

C. Both A and B

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15
Q

When a fuse is suspected of being blown and is held in your hand, you can test it with your multimeter by setting it to

A

C. Ohms

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16
Q

Humidity levels of ____ are comfortable at normal heating and cooling levels

A

A. 50%

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17
Q

In an electric hot water heater, temperature is transmitted through the water by means of ____

A

B. Convection

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18
Q

An economizer in a rooftop DX cooling unit would routinely use ____ air for cooling

A

D. 45-65 degree F

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19
Q

____ air handlers typically controls building space temperature by changing the volume of air, not the temperature

A

B. Variable by volume

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20
Q

____ is the ability of a liquid to resist flow

A

C. Viscosity

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21
Q

____ is when the heat loses through a building are the same as the amount of heat provided by the heat pumps

A

C. Valence point

22
Q

____ is the amount of moisture in the air compared to the amount of moisture it could hold if it were saturated

A

B. Relative humidity

23
Q

Air in a building must be circulated ____ to provide maximum comfort

A

Continuously

24
Q

____ is heat identified by a change of state and no temperature change

A

Latent Heat

25
Q

A ____ defines the properties of air at various conditions, correlating dry bulb temperature, wet bulb temperature, relative humidity, and dew point temperature

A

D. Psychometric chart

26
Q

A system that uses chilled water as it’s cooling medium is a(n) ____

A

C. Indirect expansion system

27
Q

A control system maintains a desired value. This value is called

A

C. Setpoint

28
Q

Valves that regulate steam and water, dampers regulate airflow, and refrigeration compressors that deliver cooling are all examples of ____

A

C. Controlled devices

29
Q

____ are routinely used to upgrade existing or older building systems into newer control technologies

A

D. Transducers

30
Q

Oil that is carried into the compressed air system that leaked by the piston rings is called ____

A

B. Carry over

31
Q

This type of compressor uses interlocking rotors to compress air

A

D. Screw

32
Q
  1. A ____ air handling unit delivers air at a constant 55 degree F to building spaces
A

C. Terminal reheat

33
Q

A ____ is commonly attached to the air handling unit and ductwork to reduce noise and vibration to building spaces

A

C. Rubber transition

34
Q

No. 6 fuel has approx __ Btu/gal

A

D. 150,000

35
Q

____ is energy released by the flow of electrons in a conductor

A

C. Electricity

36
Q

Air compressors do not use detergents because

A

A. Detergents contaminate the compressed air and damage O rings

37
Q

Why do we remove moisture from compressed air

A

A. Moisture may destroy the controls or cause them to generate improperly

38
Q

A hybrid system is a system that ____

A

B. Contains multiple technologies

39
Q

____ are the most common types of dampers used in HVAC systems

A

B. Parallel blade dampers

40
Q

____ have non-linear flow characteristics and are widely used in small terminal units like VAV boxes

A

C. Round blade dampers

41
Q

A mixing valve has ____

A

C. Two inlets one outlet

42
Q

____ is the range between two temps and no heating and cooling takes place

A

D. Deadband

43
Q

This type of element accepts moisture from and rejects moisture to the surrounding air in a humidistat

A

B. Hygroscopic

44
Q

Pneumatic transmitters are normally set up as ____

A

A. Direct acting

45
Q

A two piper pneumatic transmitter uses ____

A

B. The full volume of compressed air supply

46
Q

A one pipe pneumatic transmitter uses ____

A

A. A small amount of the compressed air supply

47
Q

A ____ senses static pressure and total pressure in a duct

A

C. Pilot tube

48
Q

Remote control point adjustment means

A

D. The ability to adjust the controller setpoint from a remote location

49
Q

Direct readjustment (summer reset) is a schedule in which

A

B. The primary variable increase while the secondary variable increases

50
Q

A ____ is a receiver controller designed to be connected to only one transmitter and maintains only on temperature, pressure, or humidity setpoint

A

B. Single input receiver controller

51
Q

A ____ is a device which accepts one or more signals from pneumatic transmitters and produces an output signal based on its calibration

A

A. Receiver controller

Years 2 Test 3 (1 decks)

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