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WorksheetsRefrigeration System Quiz
Total questions: 22
Worksheet time: 11mins
What are the two broadest categories of special HVACR system components?
Controls and accessories
Filters and compressors
Evaporators and condensers
Thermostats and fans
What is the purpose of an oil pressure safety control?
To prevent compressor damage
To increase refrigerant levels
To enhance system cooling
To reduce energy consumption
What is the set suction pressure for the evaporator pressure regulator for R-134a?
No less than 29.5 psig
No more than 29.5 psig
Exactly 30 psig
Exactly 28 psig
What happens to the EEPR valve when the discharge air temperature drops to the valve's set point?
It fully opens
It starts to throttle closed
It remains unchanged
It shuts off completely
What happens when the CPR valve is properly adjusted?
The compressor will overheat
The valve will remain closed
The valve will be fully open and the outlet pressure will equal the inlet pressure
The refrigerant will freeze
What is the role of the screen layer in a helical oil separator?
Acts as an oil stripping and draining medium
Increases the temperature of the oil
Compresses the refrigerant
Cools the oil
What is the primary function of a crankcase heater in a refrigeration system?
To increase the temperature of the refrigerant
To keep the oil in the compressor's crankcase at a temperature higher than the coldest part of the system
To cool down the compressor
To reduce the pressure in the crankcase
What is the role of low-ambient controls in refrigeration systems?
To increase the system's cooling capacity
To operate year-round and manage head pressure
To reduce system noise
To enhance energy efficiency
What is a common problem with compressor start-ups in cold ambient conditions?
Increased system efficiency
Refrigerant migration
Reduced cooling capacity
Enhanced energy efficiency
What is a potential issue with compressor start-ups with liquid refrigerant in the crankcase?
Increased system efficiency
Reduced cooling capacity
Liquid refrigerant floodback
Enhanced energy efficiency
What is the effect of a high starting current on fan motors?
It reduces system efficiency.
It increases energy consumption.
It enhances cooling capacity.
It causes frequent shutdowns.
What is the corresponding pressure when the coil temperature is 19°F?
5 psig
18 psig
25 psig
40 psig
What is the coil temperature when the air in the cooler is 34°F?
19°F
25°F
34°F
45°F
What is the expected coil temperature when the air temperature is 34°F?
19°F
25°F
34°F
45°F
What is the role of the heater circuit in the oil pressure switch time delay?
To cool the oil
To heat the oil
To clear unwanted refrigerant
To increase oil pressure
What is the primary function of a transducer-type oil safety controller?
To measure temperature
To sense a combination of oil pump discharge pressure and crankcase pressure
To control electrical circuits
To regulate motor speed
What does the inductive coil in the current sensing relay control?
A normally closed set of contacts
A normally open set of contacts
The motor speed
The oil pressure
What is the role of the plunger in a solenoid valve?
To increase the pressure
To move the valve when the coil is energized
To decrease the temperature
To control the voltage
What can cause liquid hammer in a solenoid valve system?
Slow-moving liquid
Fast-moving liquid shut off abruptly
High temperature
Low pressure
What is the correct orientation for a solenoid valve to operate properly?
Upside down
In the correct direction to the fluid flow
At a 45-degree angle
Horizontally
What is the purpose of the automatic pumpdown system in refrigeration?
To increase the temperature
To open and de-energize the liquid-line solenoid valve
To decrease the pressure
To energize the liquid-line solenoid valve
What is the purpose of the low-pressure control in an automatic pumpdown system?
To increase the refrigerant charge
To prevent refrigerant migration during the off cycle
To energize the compressor continuously
To decrease the system pressure
