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WorksheetsACR-110 CH 4 Test
Total questions: 13
Worksheet time: 7mins
Two technicians are discussing the purpose of the compressor. Technician A states that the compressor turns low-pressure vapor into high-pressure liquid. Technician B says that the compressor is responsible for pumping refrigerant through the components of the air-conditioning system.
Technician A is correct.
Technician B is correct.
Both technicians A and B are correct.
Neither technicians A nor B is correct.
The compressors used for air-conditioning in the trucking industry are driven directly or indirectly off the:
Accessory pulley
Alternator pulley
Crankshaft pulley
Water pump pulley
The compressor will draw in refrigerant ____________ while the compressor is on its ____________ stroke.
vapor/intake
vapor/exhaust
liquid/intake
liquid/exhaust
On a swash-plate style compressor, what prevents the refrigerant that is being compressed from being pushed back into the suction side of the compressor?
Piston action
Check valve
The intake reed valve
The discharge reed valve
Two technicians are discussing the discharge stroke of the compressor. Technician A states that the discharge stroke may also be referred to as the compression stroke. Technician B states that during the compression stroke, the discharge valve in the compressor must seal tightly. Which technician is correct?
Technician A is correct
Technician B is correct
Both Technicians A and B are correct.
Neither technicians A nor B is correct
What change happens to a variable displacement compressor to change its performance?
Piston stroke
Piston bore
Control valve
Suction pressure
Which of the following compressors has the fewest moving parts?
The two-piston compressor
The swash plate compressor
The rotary compressor
The scroll compressor
What is the most common cause of compressor failure?
Broken suction reed valves.
Defective bearings.
Loss of refrigerant.
Improper clutch engagement.
A refrigerant reacts chemically with moisture to:
create sludge in the crankcase of the compressor.
block the flow of refrigerant in the evaporator.
form harmful deposits on the valve plates.
form hydrochloric acid in the air-conditioning system.
Two technicians are discussing the drier. Technician A states that the drying agent is called the absorber. Technician B states the drying agent is called a desiccant. Which technician is correct?
Technician A is correct.
Technician B is correct.
Both technicians A and B are correct.
Neither technicians A nor B is correct.
The receiver-drier is used in an air-conditioning system that also uses (a) as a metering device.
a fixed orifice tube (FOT)
a thermostatic expansion valve (TXV)
Both A and B
Neither A nor B
Technician A states that the receiver-drier should be replaced any time there are major repairs made to the air-conditioning system. Technician B says that the desiccant must be suitable for the type of refrigerant used within the air-conditioning system. Which technician is correct?
technician A is correct
Technician B is correct
Both technicians A and B are correct
Neither technicians A nor B is correct
The main function of the compressor is to:
release heat energy
absorb heat energy
compress refrigerant vapor
