Modern Chap 10 - Review questions Flashcards
The _______ sets refrigerant cylinder regulations.
a) occupational safety and health administration (OSHA)
b) Environmental protection agency (EPA)
c) Department of transportation (DOT)
d) Department of Labour (DOL)
c) department of transportation (DOT)
Large refrigerant cylinders are protected against bursting by a _________
a) protective cap
b) compressible bladder at bottom of the tank
c) small surge tank
d) fusible plug
d) fusible plug
Large refrigerant cylinders called ______ cylinders are often positioned upside-down with their valves at the bottom.
a) recovery
b) storage
c) disposable
d) returnable
b) storage
The operating element used in pressure gauges that is made of a thin-walled tube of metal bent into a circular shape is called a _____.
a) bourdon tube
b) thermocouple
c) bimetal strip
d) retarder
a) bourdon tube
A pressure gauge that is specifically designed to measure lower-than-atmospheric pressure is a ____.
a) compound gauge
b) vacuum pump
c) high-pressure gauge
d) vacuum gauge
d) vacuum gauge
A pressure gauge designed to measure pressure above and below atmospheric pressure is a ___.
a) vacuum gauge
b) compound gauge
b) compound gauge
A pressure gauge that can read high-pressure values on a single continuous scale, usually from 0 to 800 psi, is a ___.
a) vacuum gauge
b) compound gauge
c) high-pressure gauge
d) recovery gauge
c) high pressure gauge
A service port is closed off from the refrigeration system when the service valve is ___.
a) backseated
b) front seated
c) mid position
a) back seated
Which of the following service valves is located on the low side of the refrigeration system?
a) discharge service valve
b) suction service valve
c) king valve
d) queen valve
b) suction service valve
Mostly used for checking pressure, a(n) ___ does not have a service valve to control the flow of refrigerant.
a) queen valve
b) king valve
c) access port
d) valve core remover
access port
The device that engages an extra spring in a pressure gauge to adjust the gauge’s calibration to higher graduation marks on its scale is a ___.
a) bourdon tube
b) thermocouple
c) bimetal strip
d) retarder
d) retarder
during normal system operation, hot high pressure refrigerant vapour flows through the _______ service valve
a) discharge
b) liquid line
c) suction line
b) liquid line
An externally threaded valve with a spring-loaded center pin is called a ___.
a) discharge service valve
b) piercing valve
c) Schrader valve
d) king valve
c) Schrader valve
A technician must use a ____ to access small hermetic systems that do not have service valves or access ports.
a) valve core remover
b) king valve
c) schrader valve
d) pricing valve
d) piercing valve
The process of removing unwanted air, vapors, dirt, or moisture from gauge manifold hoses by venting them to the atmosphere is called ___.
a) purging
b) evacuating
c) recovering
d) reclaiming
a) purging
Areas where leaks are likely to occur include all of the following except ____.
a) tubing connections
b) straight runs of tubing
c) high vibration areas
d) brazed joints
b) straight runs of tubing
Which system procedure is normally done with both hand valves opened on a gauge manifold connected to a refrigeration system?
a) brazing
b) evacuation
c) liquid charging
d) pressure readings
b) evacuation
The leak detection method involving the application of soap and water solution to areas where leaks are ___ methods
a) refrigerant dye
b) halide torch
c) ultrasonic
d) bubble solution
d) bubble solution
The leak detection method that uses an ultraviolet light to find leaking refrigerant is ___ method.
a) fluorescent dye
b) halide torch
c) electronic detector
d) bubble solution
a) fluorescent dye
The leak detection method that involves burning a fuel gas near a copper plate and using a rubber hose to siphon air near leaking refrigerant is ___ method
a) fluorescent dye
b) halide torch
c) refrigerant dye
d) ultrasonic detector
b) halide torch
Which of the following is a disadvantage of using an electronic leak detector?
a) cannot detect small leaks
b) can only be used with one refrigerant type
c) hard to see leaks in bright areas
d) produces false alarms near urethane insulation
d) produces false alarms
The leak detection method that detects the sound vapor escaping is ____ method
a) fluorescent dye
b) halide torch
c) ultrasonic detector
c) ultrasonic detector
A device used for creating vacuums to dehydrate a system is a ____.
a) vacuum gauge
b) bourdon tube
c) retarder
d) vacuum pump
d) vacuum pump
Which of the following terms is used to specify the speed at which gas can be pumped through a vacuum pump?
a) blank off pressure
b) ultimate vacuum
c) free air displacement
d) single-stage volume
c) free air displacement
