1. A fundamental law of thermodynamics states that heat always moves from
Warmer to cooler
2. To say that heat moves by conduction is to say that
A. Heat moves through a solid
3. To say that heat moves by convection is to say that
A. Heat moves through a liquid
4. To say that heat moves by radiation is to say that
A. Heat moves through the air
5. When a substance boils it
A. Absorbs heat
6. When a substance condenses it
A.Rejects heat Changing from a vapor to a liquid
7. The process of change-of-state in a refrigeration system takes place in
A. The condenser
8. The process of a creating a pressure drop in a refrigeration system occurs in
A. The metering device
9. Of the popular types of compressors used in vapor compression refrigeration systems
the least efficient is, A. The piston compressor
10. In the event that liquid droplets enter the suction side of a rotary compressor
A. A condition known as hydraulic skip will occur
11. Large refrigeration systems typically use what type of water-cooled condenser
A. Shell and Tube
12. When a refrigeration system employing an evaporative condenser is operating in cooler weather
A. The water pump may be turned off
13. When a wastewater system is employed in water-cooled condensers approximately ____ gallons of water per minute for each ton of refrigeration system capacity is circulated
A. 1.5 gallons per minute
14. When a re-circulating system is employed in water-cooled condensers approximately ____ to ____ gallons of water per minute for each ton of refrigeration system capacity is circulated.
A. 3 to 5 gallons
15. The temperature difference between the water entering and the water leaving a wastewater system is generally between:
A. 15 to 20 degrees
16. When considering the idea of refrigerant temperature the normal condensing temperature of the refrigerant in a re-circulating water-cooled system is usually ____ degrees higher than the temperature of the condenser outlet water.
A. 10 degrees
17. Two types of fixed bore metering devices are
A. Capillary Tube and Restrictor
18. From a fundamental perspective the TEV works on three pressures. They are
A. Bulb, Spring and Evaporator
19. The type of heat that brings about a change in state but not a change in temperature is
A. Latent heat
20. The purpose of a heat exchanger is to:
A. Prevent droplets of liquid in the vapor stream and Subcool the liquid to prevent flash gas in the liquid line
21. An accumulator in a refrigeration system is a storage tank for refrigerant on the
A. Suction line
22. A sight glass in a refrigeration system is typically installed
A. Between the receiver and the metering device
23. An oil pressure safety switch on a refrigeration system monitors the difference in pressure between
A. The compressor suction and oil pump discharge
24. The valve that protects the compressor in the event of a hot pull-down is
A. A CPR valve
25. Which component prevents the migration of liquid refrigerant into the compressor crankcase?
A. Crankcase Heater