Unit 9: Basic Concepts of Compression and Absorption Refrigeration Questions and Answers 100% Correct

(4-117-1.7) All refrigeration evaporators: Select one: a. require regular defrosting b. are part of the high side of the system c. are located between the expansion valve and the king valve. d. are flooded with refrigerant e. boil liquid refrigerant at low pressure and low temperature - E (4-120-1.3) One function of vibration absorbers is to: Select one: a. Lower noise levels b. Allow the load on the system to increase dramatically without straining the components in the system c. Insulate piping and make the system more efficient d. Align piping - A (4-123-2.6) In a lithium bromide refrigeration system, which of the following is the refrigerant? Select one: a. Lithium bromide b. Lithium solution c. Water d. Aqueous bromine - C (4-114-2.1) Which of the following is NOT a physical property of refrigerants? Select one: a. Saturation temperature b. Leakage tendency c. Corrosiveness d. Miscibility - C (4-113-1.6) In a closed vessel, the boiling point of a liquid can be raised by: Select one: a. Raising the liquid level in the vessel b. Lowering the pressure in the vessel c. Raising the pressure in the vessel d. Decreasing the temperature in the vessel - C (4-117-1.3) The refrigeration evaporator that increases heat exchange by crimping several thin metal plates to single-wall tubes is a Select one: a. Plate surface evaporator b. Bare tube evaporator c. Shell and tube evaporator d. Finned tube evaporator - D (4-123-2.2) In the lithium bromide refrigeration system, what is the function of the concentrator (generator)? Select one: a. To exchange heat between the high temperature refrigerant vapour and the atmosphere b. To increase the absorbency potential of used absorbent c. To speed up the evaporation of the refrigerant d. To cool the concentrated absorbent - B (4-113-1.2) Heat that causes an increase in temperature, is called _____ heat: Select one: a. Radiant b. Sensible c. Latent d. Convective - B (4-113-1.10) In a refrigeration system, the liquid refrigerant is changed to a gas in the: Select one: a. Condenser b. Receiver c. Compressor d. Evaporator - D (4-120-1.5) A liquid trap located in the suction line before a refrigeration compressor, which evaporates liquid refrigerant and returns it to the compressor as a gas, is called: Select one: a. An oil separator b. A strainer-drier c. A distributor d. An accumulator - D (4-123-2.1) Absorption refrigeration systems may use waste in order to Select one: a. pressurize the system b. evaporate water from the weak lithium bromide c. decrease the evaporation point of the refrigerant d. maintain a minimum load on the system, during periods of low cooling demand e. To increase the lithium boiling point. - B (4-117-2.3) Which of the following is NOT a common type of refrigeration condenser? Select one: a. Flooded b. Air-cooled c. Shell and tube d. Shell and coil - A (4-116-1.4) The safety head of a refrigeration compressor is designed to: Select one: a. Unload cylinders if over-loaded b. Relieve pressure due to liquid in the cylinder c. Prevent damage due to freeze-up d. Take the place of a safety relief valve - B (4-116-1.3) Which of the following is NOT considered a rotary refrigeration compressor design? Select one: a. Screw b. Sliding vane c. Scroll d. Centrifugal - D (4-118-2.2) The expansion valve in a refrigeration system Select one: a. Expands the liquid to the receiver b. Regulates the liquid refrigerant flow to the evaporator c. Is used to charge the refrigeration system d. Isolates the compressor from the condenser - B (4-123-2.5) Which of the following statements about lithium bromide absorption refrigeration systems is FALSE? Select one: a. Lithium bromide solution has the ability to absorb water vapour readily b. Evacuating the system lowers the boiling point of water c. As water vapour is absorbed by lithium bromide, the pressure in the evaporator increases d. The operating cycle in the system is continuous - C (4-115-1.5) A compression refrigeration system can be divided into two sections: a high pressure section containing the head pressure and a low pressure section carrying the _____ pressure: Select one: a. Discharge b. Saturation c. Absolute d. Suction - D