Air/Water Cooled Condensers
Air/Water Cooled Condensers
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Question 1 |
What is the purpose of a condenser?
A | It takes a low pressure liquid and changes it into a high pressure liquid |
B | It takes a high pressure gas and changes it into a high pressure liquid |
C | It takes a low pressure gas and changes it into a high pressure gas |
D | It takes a high pressure liquid and changes it into a high pressure gas |
Question 2 |
Out of what materials are the tubes on a residential or light commercial air conditioning condenser fabricated?
A | Aluminum and steel |
B | Iron and steel |
C | Steel and copper |
D | Aluminum or copper |
Question 3 |
Where in the system is the excess superheat added that must be removed before condensation in the condenser can take place?
A | At the beginning of the evaporator and at the end of the receiver |
B | At the end of the receiver and at the beginning of the TXV |
C | At the beginning of the evaporator and in the compressor |
D | At the end of the evaporator and in the compressor |
Question 4 |
What section of the condenser coil is most likely to become dirty on a unit that has a side air discharge with the fan pushing the air over the coil?
A | The outside of the coil |
B | The top section of the coil |
C | The inside of the coil |
D | The bottom section of the coil |
Question 5 |
What is a common temperature difference from the air entering a condenser ant the refrigerant condensing temperature?
A | 50-10 degrees F |
B | 10-15 degrees F |
C | 20-30 degrees F |
D | 35-45 degrees F |
Question 6 |
A split system condensing unit contains
A | Compressor, condenser, and metering device |
B | Condenser, compressor and service valves |
C | Condenser, service valves, and metering device |
D | Condenser, evaporator, and service valves |
Question 7 |
If air is trapped inside a condenser coil, what symptoms would be present?
A | High discharge pressure, low amperage, and a decrease of efficiency |
B | Low discharge pressure, high amperage, and excessive heat buildup |
C | A decrease in efficiency, a decrease of heat buildup, and high amperage |
D | An increase of heat buildup, high amperage, and high discharge pressure |
Question 8 |
What two factors affect the efficiency of a water cooled condenser?
A | The high side pressure of the condenser and the inlet water temperature |
B | The high side pressure of the condenser and the outlet water temperature |
C | The quantity of water and the temperature difference between the refrigerant and the water |
D | The quantity of water and the refrigerant condensing point compared to the water boiling point |
Question 9 |
The capacity of a water cooled condenser increases
A | As the temperature difference between the refrigerant and the water decreases |
B | As the temperature difference between the refrigerant and the water increases |
C | As the condenser outlet temperature increases |
D | As the condenser outlet temperature decreases |
Question 10 |
If the water quantity on a water cooled condenser were increased, what effect would this have on the system?
A | It decreases the power consumption of the compressor |
B | It increases the power consumption of the compressor |
C | It has no effect on the power consumption of the compressor |
D | It increases the high side pressure |
Question 11 |
When using a water cooled condenser, a decrease of water
A | Decreases the power consumption of a compressor |
B | Increases the fouling factor of the water |
C | Decreases operating pressures |
D | Increases the power consumption of the compressor |
Question 12 |
The fouling factor of the water used in a water cooled condenser
A | Increases as water quantity increases |
B | Is the measurement of heat transfer characteristics |
C | Decreases as water quantity decreases |
D | Can be controlled by a water regulating valve |
Question 13 |
What must be done when the water of a water cooled condenser has a high fouling factor?
A | The water regulating valve must be turned counterclockwise |
B | The flow rate of the water must be decreased |
C | The flow rate of the water must be increased |
D | The system flow rate must not be adjusted |
Question 14 |
The water of a water cooled condenser
A | Should never be discharged to storm drains or sewer drains |
B | Should never be reused |
C | Should always be reused |
D | Should be discharged to storm drains and storm sewers if local codes permit |
Question 15 |
What is used to control the flow of water on a water cooled condenser?
A | A check valve |
B | A pressure reducing valve |
C | A water regulating valve |
D | A float valve |
Question 16 |
Where on a water cooled condenser should a water regulating valve be located?
A | At the inlet of the condenser |
B | At the outlet of the condenser |
C | At the inlet or the outlet of the condenser |
D | Water regulating valves are not used on water cooled condensers |
Question 17 |
What two pressures control a water regulating valve?
A | The outlet water pressure and the high side pressure |
B | The inlet water pressure and the high side pressure |
C | The high side pressure and the crankcase pressure |
D | The high side pressure and the spring pressure |
Question 18 |
Which of the following is the opening force on a water regulating valve?
A | The water outlet pressure |
B | The water inlet pressure |
C | The high side pressure |
D | The spring pressure |
Question 19 |
Which of the following is the closing force on a water regulating valve?
A | Crankcase pressure |
B | The water inlet pressure |
C | The highside pressure |
D | The spring pressure |
Question 20 |
What is a common temperature difference between the high side refrigerant temperature and the temperature of the leaving water in a water cooled system?
A | 10 F |
B | 20 F |
C | 30 F |
D | 35 F |
Question 21 |
What are the effects of mineral and scale deposits on the inside of a water cooled condenser?
A | It causes the high side pressure to decrease and a decrease in water flow |
B | It causes the high side pressure to increase and a decrease in water flow |
C | It causes the leaving water temperature to decrease and an increase in water flow |
D | It causes an increase of water flow and high side pressure |
Question 22 |
Name three common water cooled condensers?
A | Coiled tube type, vertical tube type, and tube within a tube type |
B | Shell and tube type, vertical tube type, and horizontal tube type |
C | Tube within a tube type, shell and coil type, and shell and tube type |
D | Shell and coil type, a horizontal tube type, and a vertical tube type |
Question 23 |
The tube within a tube condenser uses
A | The outer tube for refrigerant and the inner tube for water |
B | The inner tube for refrigerant and the outer tube for water |
C | The inner tube for refrigerant on coil type condensers and the inner tube for water on horizontal tube types |
D | The inner tube for refrigerant on horizontal tube type condensers and the inner tube for water on coil tube types |
Question 24 |
The counterflow principle is
A | Where the cooler water is in contact with the cooler refrigerant liquid and the warmer water is in contact with the hot gas |
B | Where the warmer is in contact with the cooler refrigerant liquid and the cooler water is in contact with the hot gas |
C | Where the hot gas refrigerant meets the cool city water at its inlet |
D | Where the subcooled refrigerant meets the leaving water at its outlet |
Question 25 |
What are two common types of tube within a tube condensers?
A | Sealed coil type and flanged vertical tube type |
B | Sealed tube type and open coil type |
C | Flanged horizontal tube type and a sealed coil type |
D | Sealed horizontal tube and flanged vertical tube type |
Question 26 |
What type of tube within a tube condenser must always be chemically cleaned?
A | The sealed coil type |
B | The sealed horizontal tube type |
C | The sealed vertical tube type |
D | The open coil type |
Question 27 |
What type of tube within tube condenser can be manually or chemically cleaned?
A | The flanged coil type |
B | The flanged horizontal tube type |
C | The flanged vertical tube type |
D | The sealed coil type |
Question 28 |
The shell and coil type water cooled condenser?
A | Has the refrigerant in the coil, and water flows over the coil inside of the shell |
B | Has subcooled refrigerant leaving the coil and superheated gas entering the coil |
C | Has the refrigerant in the shell, and water flows through the coil located inside the shell |
D | Can have refrigerant or water flowing inside of the coil |
Question 29 |
The shell and coil condenser
A | Must have the coil removed in order to be properly cleaned |
B | Can be manually or chemically cleaned |
C | Cannot be chemically cleaned – must be manually cleaned |
D | Cannot be manually cleaned – must be chemically cleaned |
Question 30 |
The shell and tube type of water cooled condenser?
A | Has the refrigerant in the tubes, and water flows over the tubes inside of the shell |
B | Has subcooled refrigerant leaving the tubes and superheated gas entering the tubes |
C | Has the refrigerant in the shell, and water flows through the tubes located inside the shell |
D | Can have refrigerant or water flowing inside of the tubes |
Question 31 |
The shell and tube condenser?
A | Must be chemically cleaned |
B | Can be manually or chemically cleaned |
C | Cannot be manually cleaned |
D | Is completely sealed with no flanges and must be chemically cleaned |
Question 32 |
What is another name for the end cap of a shell and tube water cooled condenser?
A | Puddle plates |
B | Water plates |
C | Water box |
D | Water trap |
Question 33 |
The shell of a shell and tube or shell and coil condenser acts as a?
A | Liquid receiver |
B | Water storage tank |
C | Purge unit for noncondensables |
D | Subcool tank |
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