3B2 CHAPTER 11 ABSA questions with accurate
answers
___________ of the compressor means matching the flow rate through
the compressor to the refrigeration load Ans✓✓✓ capacity control
"The important components of the thermostatic expansion valve are"
Bellows: Responds to pressure changes in the sensing line and does what
Ans✓✓✓ converts these changes into linear motion of the push rod
"The important components of the thermostatic expansion valve are"
Capillary tube: Used to transmit what Ans✓✓✓ pressure between the
feeler bulb and bellows
"The important components of the thermostatic expansion valve are"
Feeler bulb:The refrigerant pressure inside the bulb reacts to temperature
changes. These changes are transmitted the Ans✓✓✓ cappillary tube in
order to actuate the valve
"The important components of the thermostatic expansion valve are"
Power element: Ans✓✓✓ Valve actuating mechanism
"The important components of the thermostatic expansion valve are"
Pushrod: Ans✓✓✓ connects bellows to valve yoke
,"The important components of the thermostatic expansion valve are"
Valve yoke: Ans✓✓✓ bracket between the push rod and valve
A appillary tube is a metering device used in place of an expansion valve
in domestic and small commercial applications with Ans✓✓✓
relatively constant heat loads
A conventional pressure relie valve Ans✓✓✓ -directly affected by
changes in the back pressure
A low pressure control for the compressor cannot be used with
Ans✓✓✓ an automatic expansion valve
A non closing pressure relief device is designed to operate and then
Ans✓✓✓ remain open after operation
A remote bulb thermostat has the sensing element located Ans✓✓✓ at
some distance from the thermostat itself
A technician uses manifold gauge set when charging refrigerant. IT uses
colours for the gauges and hoses what does each colour mean
Blue:
Red:
Yellow: Ans✓✓✓ Low side
high side
, Utility connections
A thermostatic expansion valve is designed to mainatin a specific
amouny of what Ans✓✓✓ -superheat at the outlet of the evaporator
A two step scroll compressor has an __________ that opens a bypass
port or vent at the end of the first compression pocket Ans✓✓✓ -
Internal unloading mechanism
adding refrigerant to a system is reffered to as Ans✓✓✓ charging
An aerosol is a suspension of fine particles dispersed in a gas. Oil
seperators rely on physical principles in order to perform Ans✓✓✓ -
coalescence
-remove fine liquid droplets in the gas stream
an oil stil is a vessel that Ans✓✓✓ collects oil and entrained refrigerant
Another method of capacity control for reciprocating compressors is to
bypass the Ans✓✓✓ discharge from one or more cylinders back to the
suction side of the compressor
Before charging a newly built refrigeration system that just had
signifigant repairs a ________ is mainted in the systems for a period of
time to __________ Ans✓✓✓ -high vacuum
-evaporate moisture
answers
___________ of the compressor means matching the flow rate through
the compressor to the refrigeration load Ans✓✓✓ capacity control
"The important components of the thermostatic expansion valve are"
Bellows: Responds to pressure changes in the sensing line and does what
Ans✓✓✓ converts these changes into linear motion of the push rod
"The important components of the thermostatic expansion valve are"
Capillary tube: Used to transmit what Ans✓✓✓ pressure between the
feeler bulb and bellows
"The important components of the thermostatic expansion valve are"
Feeler bulb:The refrigerant pressure inside the bulb reacts to temperature
changes. These changes are transmitted the Ans✓✓✓ cappillary tube in
order to actuate the valve
"The important components of the thermostatic expansion valve are"
Power element: Ans✓✓✓ Valve actuating mechanism
"The important components of the thermostatic expansion valve are"
Pushrod: Ans✓✓✓ connects bellows to valve yoke
,"The important components of the thermostatic expansion valve are"
Valve yoke: Ans✓✓✓ bracket between the push rod and valve
A appillary tube is a metering device used in place of an expansion valve
in domestic and small commercial applications with Ans✓✓✓
relatively constant heat loads
A conventional pressure relie valve Ans✓✓✓ -directly affected by
changes in the back pressure
A low pressure control for the compressor cannot be used with
Ans✓✓✓ an automatic expansion valve
A non closing pressure relief device is designed to operate and then
Ans✓✓✓ remain open after operation
A remote bulb thermostat has the sensing element located Ans✓✓✓ at
some distance from the thermostat itself
A technician uses manifold gauge set when charging refrigerant. IT uses
colours for the gauges and hoses what does each colour mean
Blue:
Red:
Yellow: Ans✓✓✓ Low side
high side
, Utility connections
A thermostatic expansion valve is designed to mainatin a specific
amouny of what Ans✓✓✓ -superheat at the outlet of the evaporator
A two step scroll compressor has an __________ that opens a bypass
port or vent at the end of the first compression pocket Ans✓✓✓ -
Internal unloading mechanism
adding refrigerant to a system is reffered to as Ans✓✓✓ charging
An aerosol is a suspension of fine particles dispersed in a gas. Oil
seperators rely on physical principles in order to perform Ans✓✓✓ -
coalescence
-remove fine liquid droplets in the gas stream
an oil stil is a vessel that Ans✓✓✓ collects oil and entrained refrigerant
Another method of capacity control for reciprocating compressors is to
bypass the Ans✓✓✓ discharge from one or more cylinders back to the
suction side of the compressor
Before charging a newly built refrigeration system that just had
signifigant repairs a ________ is mainted in the systems for a period of
time to __________ Ans✓✓✓ -high vacuum
-evaporate moisture
