Lubricants

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Question 1

The properties of mineral oil are very common to the properties of?

A	Petroleum oil
B	Polyol ester oil
C	Alkylbenzene oil
D	PAG oil

Question 2

Which refrigerant is not miscible with mineral oil?

A	R - 12
B	R – 11
C	R – 409A
D	R – 134A

Question 3

Which lubricant is most commonly used with CFC refrigerants?

A	Polyol ester
B	Mineral
C	Polyalkylene gycol
D	Synthetic

Question 4

Which lubricant is most commonly used with R – 134A refrigerant?

A	Polyol ester
B	Mineral
C	Alkylbenzene
D	Petroleum based oils

Question 5

What are two compounds that are used to compose an alkybenzene lubricant?

A	Alcohol and benzene
B	Glycol and alcohol
C	Propylene and glycol
D	Propylene and benzene

Question 6

What types of refrigerants commonly use alkylbenzene lubricants?

A	CFC and HFC
B	HCFC and HFC
C	CFC and HCFC
D	HFC only

Question 7

What systems commonly use PAG lubricants?

A	Automotive air conditioning
B	Residential air conditioning systems
C	Cascade refrigeration systems
D	Chillers

Question 8

What does PAG stand for?

A	Polyurethane alkylene glycol
B	Polymorphous alkylene glycol
C	Polyalkylene glycol
D	None of the above

Question 9

Hygroscopic oil

A	Has a high attraction to moisture
B	Should be stored at ambient temperatures
C	Can be left open to the atmosphere
D	Has a low attraction to moisture

Question 10

Corrosion will start to form inside of an air conditioning system is the moisture content exceeds?

A	10 ppm
B	100 ppm
C	200 ppm
D	250 ppm

Question 11

What are two good characteristics of oil?

A	High floc point, and low hygroscopic ability
B	Low carbon forming tendency and high hygroscopic ability
C	High floc point and high carbon forming tendency
D	Low floc point and low hygroscopic ablility

Question 12

Which of the following refers to the temperature at which oil starts to produce a waxy substance?

A	Floc point
B	Pour point
C	Sludge point
D	Flow point

Question 13

Which of the following refers to the ability of oil to flow at very low temperatures?

A	Viscous point
B	Flow point
C	Pour point
D	Floc point

Question 14

A miscible fluid has?

A	The ability to mix well with another fluid
B	The ability to flow at low temperatures
C	Extremely thin qualities
D	Extremely dense qualities

Question 15

Why is it necessary to increase the dehydration time of a system using synthetic oil compared to a system using a mineral oil?

A	Because a synthetic oil has a higher evaporation point than a mineral oil
B	Because a mineral oil has a higher evaporation point than a synthetic oil
C	Because a synthetic oil has a higher hygroscopic capability
D	Because a mineral oil has a higher hygroscopic capability

Question 16

Which oil has the ability to absorb the most moisture?

A	PAG oil
B	Polyol ester oil
C	Mineral oil
D	Both A and B

Question 17

Polyol ester oil will tolerate a mixture of?

A	8% of mineral oil
B	3 to 5% of mineral oil
C	10 to 20% of mineral oil
D	40 to 50% of mineral oil

Question 18

High viscosity oil

A	Is used on low temperature systems only
B	Is a thin oil
C	Is a thick oil
D	Is used on medium temperature systems only

Question 19

What is the point at which the vapors of an oil will ignite but the flame will not persist?

A	Burn point
B	Flash point
C	Floe point
D	Pour point

Question 20

The refrigerant considered most likely to replace HCFC-22 is _____.

A	HFC-410A
B	HFC-404A
C	HCFC-22A
D	HFC-411

Question 21

CFC refrigerants do not contain _____.

A	carbon
B	hydrogen
C	chlorine
D	fluorine

Question 22

HFC refrigerants do not contain _____.

A	fluorine
B	hydrogen
C	chlorine
D	carbon

Question 23

Which synthetic refrigerant oil is characterized as not being hygroscopic?

A	PVE
B	PAG
C	POE
D	Alkylbenzene

Question 24

Class _____ refrigerants are considered flammable.

A	III
B	IV
C	II
D	I

Question 25

Disposable cylinders of HCFC-410A are _____.

A	pink
B	gray with a yellow top
C	white
D	light green

Question 26

On an HCFC-22 system, liquid line pressure is 202 psig and the measured liquid line temperature is 100F. What is the subcooling?

A	2°
B	4°
C	8°
D	1°

Question 27

The system parameters needed to determine superheat are _____.

A	suction line temperature and suction pressure
B	suction line pressure and subcooling temperature
C	suction line temperature and subcooling temperature
D	liquid line temperature and suction pressure

Question 28

When checking a system for leaks using a leak detecting fluid, always _____.

A	add a small amount of refrigerant backed up with regulated nitrogen
B	pressurize the system with oxygen
C	add a small amount of refrigerant backed up with compressed air
D	pressurize the system with regulated dry nitrogen

Question 29

If oil is not returning to the compressor, a likely cause is _____.

A	incorrect refrigerant type
B	poor miscibility
C	oil viscosity
D	poorly designed refrigerant piping

Question 30

Which of the following refrigerant oils is glycol-based?

A	POE
B	PAG
C	PVE
D	Alkylbenzene

Question 31

You need to add POE oil to a compressor. Which of the following is the correct procedure for doing this?

A	Obtain the oil from a 55-gallon drum.
B	Use the remaining oil from a one-gallon can.
C	Pump the oil in.
D	Pour the oil in through a funnel.

Question 32

Which of the following statements about converting a system from one refrigerant to another is incorrect?

A	Synthetic and mineral oils are completely compatible.
B	A new metering device may be required.
C	Gaskets and O-rings may have to be changed.
D	Equipment capacity may change with the new refrigerant.

Question 33

To find out what effects a refrigerant or oil can have on your skin, consult _____.

A	a local hospital's poison control hot line
B	the U.S. Department of Transportation (DOT)
C	the product's MSDS
D	the EPA

Question 34

Which of the following cannot prevent moisture contamination of a refrigeration system?

A	Plugging piping that is exposed to the atmosphere
B	Installing a filter-drier
C	Evacuating the system before starting it up
D	Using plumbing-grade copper tubing

Question 35

Which of the following refrigerant conversions is not considered a drop-in?

A	HCFC-123 for CFC-11
B	HFC-407C for HCFC-22
C	HFC-410A for HCFC-22
D	HCFC-409A for CFC-12

Question 36

When using a P-T chart for a single-compound refrigerant, knowing the suction pressure at saturation enables the _____ to be found.

A	bubble point
B	liquid pressure
C	subcooling
D	suction line temperature

Question 37

Foaming of refrigerant oil cannot be prevented by _____.

A	use of a crankcase heater
B	adding additional oil to the crankcase
C	maintaining a proper oil level
D	using oil with an anti-foaming additive

Question 38

In a system that uses synthetic oil, up to _____ percent of mineral oil is allowable in the system.

A	5
B	20
C	15
D	10

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Lubricants

Lubricants

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