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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
A ____ defines the properties of air at various conditions, correlating dry bulb temperature, wet bulb temperature, relative humidity, and dew point temperature
D. Psychometric chart
26
A system that uses chilled water as it’s cooling medium is a(n) ____
C. Indirect expansion system
27
A control system maintains a desired value. This value is called
C. Setpoint
28
Valves that regulate steam and water, dampers regulate airflow, and refrigeration compressors that deliver cooling are all examples of ____
C. Controlled devices
29
____ are routinely used to upgrade existing or older building systems into newer control technologies
D. Transducers
30
Oil that is carried into the compressed air system that leaked by the piston rings is called ____
B. Carry over
31
This type of compressor uses interlocking rotors to compress air
D. Screw
32
42. A ____ air handling unit delivers air at a constant 55 degree F to building spaces
C. Terminal reheat
33
A ____ is commonly attached to the air handling unit and ductwork to reduce noise and vibration to building spaces
C. Rubber transition
34
No. 6 fuel has approx __ Btu/gal
D. 150,000
35
____ is energy released by the flow of electrons in a conductor
C. Electricity
36
Air compressors do not use detergents because
A. Detergents contaminate the compressed air and damage O rings
37
Why do we remove moisture from compressed air
A. Moisture may destroy the controls or cause them to generate improperly
38
A hybrid system is a system that ____
B. Contains multiple technologies
39
____ are the most common types of dampers used in HVAC systems
B. Parallel blade dampers
40
____ have non-linear flow characteristics and are widely used in small terminal units like VAV boxes
C. Round blade dampers
41
A mixing valve has ____
C. Two inlets one outlet
42
____ is the range between two temps and no heating and cooling takes place
D. Deadband
43
This type of element accepts moisture from and rejects moisture to the surrounding air in a humidistat
B. Hygroscopic
44
Pneumatic transmitters are normally set up as ____
A. Direct acting
45
A two piper pneumatic transmitter uses ____
B. The full volume of compressed air supply
46
A one pipe pneumatic transmitter uses ____
A. A small amount of the compressed air supply
47
A ____ senses static pressure and total pressure in a duct
C. Pilot tube
48
Remote control point adjustment means
D. The ability to adjust the controller setpoint from a remote location
49
Direct readjustment (summer reset) is a schedule in which
B. The primary variable increase while the secondary variable increases
50
A ____ is a receiver controller designed to be connected to only one transmitter and maintains only on temperature, pressure, or humidity setpoint
B. Single input receiver controller
51
A ____ is a device which accepts one or more signals from pneumatic transmitters and produces an output signal based on its calibration
A. Receiver controller

Years 2 Test 3 (1 decks)

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