NATE/ICE Test QUESTIONS AND ANSWERS 100% ACCURATE.
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
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
