NATE/ICE Test TESTS WITH ANSWERS A+ GRADE.
an _____ refrigerant is a mixture of two or more refrigerants that performs as a single component
refrigerant - azeotropic
a _____ refrigerant is a mixture of two or more refrigerants that have different boiling points - near-
azeotropic
a _____ refrigerant is a mixture of two or more refrigerants that have different boiling points - zeotropic
a _____ refrigerant is a blend of three refrigerants that acts as a zeotropic refrigerant - ternary
zeotropic and near-azeotropic refrigerant must be charged into a system as a _____ or the refrigerant will
change it's composition - liquid
dewpoint line - used to measure superheat
bubble like - used to measure subcooling
temperature glide - The temperature difference between the vapor and liquid state of a near-azeotropic, a
zeotropic, and ternary blend refrigerant
an zeotropic refrigerant has a temperature glide of _____ - zero
a near-azeotropic refrigerant has a temperature glide above _____ up to _____ degrees fahrenheit - * zero
* 10
_____ occurs when a zeotropic or a ternary refrigerant is added to a system as a gas - fractionation
mineral oils are often referred to as _____ oils - petroleum
, mineral oils are most commonly used with - CFC refrigerants
synthetic oils are _____ chemicals produced to function as lubricants - man-made
synthetic lubricants absorbs more _____ than a mineral oil - moisture
polyol ester lubercants should be stored in their own container because _____ can permeate through
certain materials - maisture
polyol ester oils is the only lubricant suitable to use with _____ - R-134A
_____ oil is a synthetic oil made by mixing benzene and propylene - Alkylbenzene
alkylbenzene oil is commonly used with _____ refrigerant and can be used with CFC refrigerants - HCFC
floc point - Is the temperature at which oil starts to produce a waxy substance
pour point - Is the ability of oil to flow with refrigerants at a very low temperatures
miscibility - Is the ability of a fluid to readily mix with another fluid
hygroscopic oil had a _____ ability to absorb moisture - high
if moisture levels seen more than _____ ppm in an air conditioning or refrigeration system, corrosion will
result. - 100
reciprocating compressors use _____ to compress the refrigerant gas - pistons
positive displacement compressors: - * reciprocating
* rotary
* screw
an _____ refrigerant is a mixture of two or more refrigerants that performs as a single component
refrigerant - azeotropic
a _____ refrigerant is a mixture of two or more refrigerants that have different boiling points - near-
azeotropic
a _____ refrigerant is a mixture of two or more refrigerants that have different boiling points - zeotropic
a _____ refrigerant is a blend of three refrigerants that acts as a zeotropic refrigerant - ternary
zeotropic and near-azeotropic refrigerant must be charged into a system as a _____ or the refrigerant will
change it's composition - liquid
dewpoint line - used to measure superheat
bubble like - used to measure subcooling
temperature glide - The temperature difference between the vapor and liquid state of a near-azeotropic, a
zeotropic, and ternary blend refrigerant
an zeotropic refrigerant has a temperature glide of _____ - zero
a near-azeotropic refrigerant has a temperature glide above _____ up to _____ degrees fahrenheit - * zero
* 10
_____ occurs when a zeotropic or a ternary refrigerant is added to a system as a gas - fractionation
mineral oils are often referred to as _____ oils - petroleum
, mineral oils are most commonly used with - CFC refrigerants
synthetic oils are _____ chemicals produced to function as lubricants - man-made
synthetic lubricants absorbs more _____ than a mineral oil - moisture
polyol ester lubercants should be stored in their own container because _____ can permeate through
certain materials - maisture
polyol ester oils is the only lubricant suitable to use with _____ - R-134A
_____ oil is a synthetic oil made by mixing benzene and propylene - Alkylbenzene
alkylbenzene oil is commonly used with _____ refrigerant and can be used with CFC refrigerants - HCFC
floc point - Is the temperature at which oil starts to produce a waxy substance
pour point - Is the ability of oil to flow with refrigerants at a very low temperatures
miscibility - Is the ability of a fluid to readily mix with another fluid
hygroscopic oil had a _____ ability to absorb moisture - high
if moisture levels seen more than _____ ppm in an air conditioning or refrigeration system, corrosion will
result. - 100
reciprocating compressors use _____ to compress the refrigerant gas - pistons
positive displacement compressors: - * reciprocating
* rotary
* screw
