CET FINAL EXAM LATEST 2023-24 NEW SEMESTER
EXAM GUARANTEED PASS
Ozone depletion is caused by__________. - ANSWER: Chlorine
R-410A is _________________. - ANSWER: A binary near-azeotropic mixture
The Federal Clean Air Act calls for the phase out of HCFC-22 in accordance
with___________. - ANSWER: The Montreal Protocol
The SEER indicates the_____________. - ANSWER: Seasonal Energy Efficiency Ratio
TEWI takes into consideration_______effects of global warming. - ANSWER: all the
direct and indirect
A compressor designed for use with R-22________. - ANSWER: should never be used
with R-410A
A compression ratio of 5:1 indicates that________. - ANSWER: the absolute
discharge pressure is 5 times the absolute suction pressure
Liquid lines used with R-22_________. - ANSWER: may be used with R-410A if sized
and properly cleaned
Evaporating pressure is also known as_____________. - ANSWER: back pressure,
suction pressure and/or low-side pressure
Condensing pressure is also known as____________. - ANSWER: discharge pressure
Whenever possible, to avoid fractionation, charging of a refrigeration system
incorporating a near-azeotrophic blend should be done with_____________. -
ANSWER: A liquid refrigerant
For commercial and industrial refrigeration systems, a ______annual leak rate is
considered a substantial leak. - ANSWER: 35%
A pressure/temperature chart which shows a dew point and bubble point is
for_______. - ANSWER: a near-azeotropic blend.
The temerature glide for R-410A at a typical air conditioning and refrigeration
temperature is_______________. - ANSWER: less than .03 degree F
Most refrigerant blends are___________. - ANSWER: either binary or ternary
The function of refrigeration oil is to___________. - ANSWER: minimize wear,
transfer heat, and seal and prevent blow by
, Polyolester lubricants (POEs) are used extensively with______. - ANSWER: HFCs
Oils are categorized into these two groups,_________. - ANSWER: synthetic and
natural
Polyolester (POE) oils stored in plastic containers will______. - ANSWER: absorb
moisture through the plastic
Polalkylene Glycol (PAG) oils__________. - ANSWER: are extremely hygroscopic.
Refrigerants exposed to high temperature may_________. - ANSWER: decompose,
fractionate, and create corrosive elements
To lockout electrical equipment, turn off electrical power, lock it in the off position,
then place a lockout tab at the power distribution panel. What do you do with the
lock key? - ANSWER: Keep it on you until you are ready to turn the power back on.
The MSDS contains_________. - ANSWER: safety data
ASHRAE Standard 15 requires that each refrigeration system be equipped
with_________. - ANSWER: a pressure relief valve.
The discharge pressure of R-410A can be______higher than R-22. - ANSWER: 40%-
70%
Charging an R-410A system until the sight glass is clear may result in_________. -
ANSWER: a system overcharge or a proper charge
A mineral oil refrigeration system that is retrofitted with an HFC refrigerant
blend_______. - ANSWER: will not require extensive flushing of the oil
An advantage of ester-based oils such as Polyolester is______. - ANSWER: they have
a wax-free composition
R-410A is a more efficient than R-22, therefore it has a lower_________rating. -
ANSWER: TEWI (Total Equivalent Warming Impact)
When mixed with air at pressure above 1 atmosphere, R-410 may
become_____________. - ANSWER: combustible
R-22 is a_________. - ANSWER: HCFC
An overcharged system can cause____________. - ANSWER: high side pressure
increase
Which of the following types of compressors is the most efficient? - ANSWER: Scroll
EXAM GUARANTEED PASS
Ozone depletion is caused by__________. - ANSWER: Chlorine
R-410A is _________________. - ANSWER: A binary near-azeotropic mixture
The Federal Clean Air Act calls for the phase out of HCFC-22 in accordance
with___________. - ANSWER: The Montreal Protocol
The SEER indicates the_____________. - ANSWER: Seasonal Energy Efficiency Ratio
TEWI takes into consideration_______effects of global warming. - ANSWER: all the
direct and indirect
A compressor designed for use with R-22________. - ANSWER: should never be used
with R-410A
A compression ratio of 5:1 indicates that________. - ANSWER: the absolute
discharge pressure is 5 times the absolute suction pressure
Liquid lines used with R-22_________. - ANSWER: may be used with R-410A if sized
and properly cleaned
Evaporating pressure is also known as_____________. - ANSWER: back pressure,
suction pressure and/or low-side pressure
Condensing pressure is also known as____________. - ANSWER: discharge pressure
Whenever possible, to avoid fractionation, charging of a refrigeration system
incorporating a near-azeotrophic blend should be done with_____________. -
ANSWER: A liquid refrigerant
For commercial and industrial refrigeration systems, a ______annual leak rate is
considered a substantial leak. - ANSWER: 35%
A pressure/temperature chart which shows a dew point and bubble point is
for_______. - ANSWER: a near-azeotropic blend.
The temerature glide for R-410A at a typical air conditioning and refrigeration
temperature is_______________. - ANSWER: less than .03 degree F
Most refrigerant blends are___________. - ANSWER: either binary or ternary
The function of refrigeration oil is to___________. - ANSWER: minimize wear,
transfer heat, and seal and prevent blow by
, Polyolester lubricants (POEs) are used extensively with______. - ANSWER: HFCs
Oils are categorized into these two groups,_________. - ANSWER: synthetic and
natural
Polyolester (POE) oils stored in plastic containers will______. - ANSWER: absorb
moisture through the plastic
Polalkylene Glycol (PAG) oils__________. - ANSWER: are extremely hygroscopic.
Refrigerants exposed to high temperature may_________. - ANSWER: decompose,
fractionate, and create corrosive elements
To lockout electrical equipment, turn off electrical power, lock it in the off position,
then place a lockout tab at the power distribution panel. What do you do with the
lock key? - ANSWER: Keep it on you until you are ready to turn the power back on.
The MSDS contains_________. - ANSWER: safety data
ASHRAE Standard 15 requires that each refrigeration system be equipped
with_________. - ANSWER: a pressure relief valve.
The discharge pressure of R-410A can be______higher than R-22. - ANSWER: 40%-
70%
Charging an R-410A system until the sight glass is clear may result in_________. -
ANSWER: a system overcharge or a proper charge
A mineral oil refrigeration system that is retrofitted with an HFC refrigerant
blend_______. - ANSWER: will not require extensive flushing of the oil
An advantage of ester-based oils such as Polyolester is______. - ANSWER: they have
a wax-free composition
R-410A is a more efficient than R-22, therefore it has a lower_________rating. -
ANSWER: TEWI (Total Equivalent Warming Impact)
When mixed with air at pressure above 1 atmosphere, R-410 may
become_____________. - ANSWER: combustible
R-22 is a_________. - ANSWER: HCFC
An overcharged system can cause____________. - ANSWER: high side pressure
increase
Which of the following types of compressors is the most efficient? - ANSWER: Scroll
