midterm RAC 1, 2, 3, 8, 9, 11

the oil in a vacuum pump should be changed after each time it is used.

GOOD VENTILATRION IS IMPORTANT WHEN WORKING AROUND REFRIGERATION EQUIPMENT BECAUSE MODERN REFRIGERANTS _____.

to pull a vacuum means to ______.

to insure accurate testing, the best material to use for connecting lines to the vacuum pump and gauge set is _______.

the law requires technicians to recover refrigerant from all refrigeration systems so that they ________.

water boils at 100F at sea level under stanard atmospheric conditions.

a compound gauge ______.

refrigerants that have a low ozone depletion potential will, in turn, have a high total equivalent warming impact (TEWI)

if the ammeter is off by more than _______%, it should be sent to the repair shop or replaced.

to pump down a system, the king valve must be ___________.

the best method of leak checking is when the refrigeration system is ______.

the discharge gas from the compressor is a high pressure, high temperature superheated vapor.

to clean refrig by use of filter dryers to be reused in the same unit or one owned by the same person/owner is called___

a device commonly used for detecting refrigerant leaks is a(n) _________.

the compressor in a refrigeration system __________.

which of the following is an example of an HCFC refrigerant?

after repairing a system that has had a comp burnout it is good field practice to reuse the recovered refrig in that sys

the abbreviation for refrigerants containing chorine, fuorine, carbon, and hydrogen is ________.

some instruments cannot be calibrated.

what color code is used by r-134a refrigerant

a micron gauge is used to measure ____________.

a ton of refrigeration is equal to __________.

vapor is denser than liquid and, as the liquid refrigerant boils, it has a tendency to sink.

which of the following refrigerants is considered an HFC-type of refrigerant?

if there are bibbles in the sight glass, the technician must always add refrigerant to the system.

reciprocating compressors have ___________.

for a system in normal running operation, the king valve must be ____________.

three reference points for checking temperature measuring instruments are ____

the DOT approved cylinder used for recovering refrigerant is gray and red.

the boiling point of a refrigerant should be low enough at atmospheric pressure to keep the sys press above 0 psig

non-condensable gases __________.

when moisture is present in a refrigeration system, it will react with the refrigerant and the oil to form ______.

where is the accumulator located?

the ______ is used most frequently for amperage checks.

which of the following represents the lowes vacuum?

while in a vac, water under the oil in a motor comp assembly can be removed by turning comp on with no effect on sys

when a tech works for a company in which the tech doesn't have a financial interest tech doesn't need to be certified

at what pressure range does the technician valve off the vacuum pump when evacuating to a deep vacuum?

to process refrigerant to new product specifications is called __________.

to remove the refrigerant from a system without any testing or processing and to put into an approved cylinder _______.

what is the purpose of an accumulator?

modern refrig have become state of the art app some models include beverage and ice disp have t.v. and world wide web

a refrigerant recovered from a system may be charged into any other system.

_______ can detect leak rates of about 1/4 oz per year

the halide leak detector should be used in well ventilated areas / resulting blue or green flame indicates phosgene gas

if a cyl of r-22 is moved from a 100F truck body into an 80F shop the quantity of refrig in the cyl will remain the same

receivers are located in which line?

to check the temp leads of an electronic thermometer for low temp, they should be stirred in a container of _______.

mechanical refrigerant recovery equipment must meet specifications established by the 1993 ASHRI 740 standard.

the temperature inside the refrigerator fresh food section should be about _______.

the ____ are used to change the vapor to a liquid and the liquid form back into a vapor, the refrigeration cycle

air entering a refrigerant system can eventually lead to compressor failure.

the evaporator in a refrigeration system _________.

the only location where the refrigerant apor is superheated is in the evaporator.

the ___ relationship correlates the vapor press/boiling point of water and is the basis for controlling cooling sys temp

high temperature refrigeration is that produced by _________.

the maximum recommended pressure for leak testing is 150 psig on the low pressure side of the system.

the accuracy of a thermometer is more important when working on high temperature refrigeration(air conditioning) systems

refrigeration can be described as ___________.

suction line filter driers work best when installed on the suction line

the abbeviation for refrigerants containing fuorine, carbon, and hydrogen is ______.

the condenser ___________.

the evaporator absorbs heat.

clearance tolerances are such that the ordinary clean refrigerant oil can be used satisfactorily in a vacuum pump.

only liquid refrigerant should enter the metering device.

what color code is used by r-22 refrigerant

which of the following refrigerants is a CFC type refrigerant?

moisture in a liquid state must be _______before it can be removed with vacuum pump.

flue gas analysis instr. analyze products of comb from fossil fuel burning equip such as oil and gas furnaces and ______

the abbreviation for refrigerants containing chorine, fluorine, and carbon is ______.

it is important to note that ohm's law, will hold for AC powered circuits that are used to operate resistive type loads

the condenser absorbs heat as liquid refrigerant boils.

a multiple evacuation means to ___________.

which type of refrigerant has the highest ozone depletion potential(ODP).

how many chorine atoms does it take to destroy 100,00 ozone molecules in the stratosphere?