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MIDTERM UNITS 1-8 > UNIT 5 > Flashcards

UNIT 5 Flashcards

1
Q

Used to make sure bearings in motor and driven devices are not overloaded to cause bearing failure.

A

Belt tension gauge

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2
Q

Used to measure vacuum in microns.

A

Electronic vacuum gauge

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3
Q

Used to view areas/items that are not readily accessible.

A

Inspection mirror

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4
Q

Used to measure flue gas compounds such as CO2, O2 and SO2.

A

Electronic combustion analyzer

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5
Q

Used to straighten vent condenser and evaporator fins.

A

Fin straighteners

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6
Q

Can be electronic, halide, soap bubbles, dye or ultrasonic.

A

Leak detectors

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7
Q

Used to install strap clamps around flexible duct.

A

Nylon strap fastener

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8
Q

Used to braze, solder, or weld using an oxygen acetylene gas mixture.

A

Oxyacetylene unit

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9
Q

Used to check relative humidity.

A

Sling psychrometer

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10
Q

Used to remove air and non-condensables from an AC system.

A

Vacuum pump

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11
Q

Can be slipped over tubing to access flare nuts to loosen or tighten.

A

Flare nut wrench

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12
Q

Used to check the flue gas pressure in gas and oil furnaces.

A

Draft gauge

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13
Q

Used to check temperatures. Can be pocket type, glass stem, laser/infrared or digital.

A

Thermometer

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14
Q

Used to measure very high resistances.

A

Megohmmeter

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15
Q

Used to flare ends of copper tubing.

A

Flaring tool

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16
Q

HVAC technician’s primary diagnostic tool used to check pressures in a system.

A

Gauge manifold

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17
Q

Used to cut PVC tubing.

A

Plastic tubing shear

18
Q

Lever, spring type, or ratchet/gear type used to bend soft tubing.

A

Tube benders

19
Q

Used to pierce system tubing on hermetically sealed units.

A

Tube piercing valves

20
Q

True or false
A refractometer is used when retrofitting a mineral oil system with POE oil.

A

True

21
Q

True or false
A tap is used to make external threads on a section of rigid pipe.

A

False

22
Q

True or false
A liquid restrictor converts liquid refrigerant into vapor when charging liquid into the suction side of the system.

A

True

23
Q

True or false
Tin snip handles are color coded to indicate left-turning, right-turning and straight cuts.

A

True

24
Q

True or false
Combustion testing instruments need to be calibrated each year.

A

True

25
Q

True or false
Non-condensables, air and moisture cause excessive pressures in a refrigeration system.

A

True

26
Q

True or false
When using a 2-valve, three hose manifold gauge to check pressures, the manifold valves must be in the open position for the system pressure to register on the gauges.

A

False

27
Q

True or false
The non-contact voltage (NVC) feature on a multimeter can be used to determine between high and low voltage in a circuit.

A

False

28
Q

True or false
A rasp is used instead of a file when a larger amount of material needs to be removed.

A

True

29
Q

True or false
A clamp-on meter will give a false reading if two conductors are in the measuring loop/clamp.

A

True

30
Q

Name two things the vacuum gauge is used for.

A

*check vacuum pump oil
*measures vacuum
Also prepares recovery cylinder at 1000 microns

31
Q

In order to attach a flare nut to the end of a piece of copper tubing, what tool(s) must be used?

A

Flare block, reaming tool, flaring tool

32
Q

When using an adjustable wrench, how is the wrench placed and where is the force exerted?

A

Stationery side against nut, pull force is on stationary side.
*wrench is placed or clamp around the nut. Push force is on stationary side
*force exerted in pushing motion to loosen & pulling motion to tighten

33
Q

When trying to detect a leak by the sound it makes, what tool would you use?

A

Ultrasonic leak detector

34
Q

Describe what the function of each hose on a 4-valve, 4-hose gauge manifold.

A

Yellow hose- charges/recovers refrigerant or nitrogen
Black hose- deep vacuums the system
Red hose- connects to the high pressure side of system- pressure reading
Blue hose- connects to low pressure side of system- pressure reading

35
Q

Rank the following torch gases according to their level of heat produced from high to low (1 to 4).

____. Acetylene
____. Propane
____. Oxyacetylene
____. MAP Pro

A

2
4
1
3

36
Q

Give an example of sublimation

A

A substance that gives a phase change such as ice into vapor

37
Q

How many microns in an inch?

A

25,400 microns in a inch

38
Q

How would you remove moisture from refrigerant in a system?

A

Use a filter drier

39
Q

Which type of refrigerant has the highest ozone depletion potential?

A

CFC

40
Q

Which ASHRAE classification means slightly flammable?

A

A2L

41
Q

Which of the following is an example of a non-condensable?

A. Moisture
B. Air
C. R-12
D. R-134a

A

B. Air

42
Q

When first inspecting a hermetic system known to be leaking, you should look for _______.

A

Traces of oil

MIDTERM UNITS 1-8 (8 decks)

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