RETA Chapter 1 Study Questions with complete solutions

RETA Chapter 1 Study Questions with complete solutions The primary purpose of a refrigeration system is A. To freeze food B. To cool buildings C. To preserve food D. To maintain a temperature -Correct Answer-D. To maintain a temperature Operators must keep refrigeration systems operating safely and efficiently. Which of the following best describes the required knowledge for this to be possible? -Correct Answer-A. Basic physical principles, interprtaetion of information from temperature and pressure gauges, and basic operating principles. Mechanical refrigeration is a series of steps that A. moves heat energy from a space or object to an area where it can do no harm. B. adds cold to a space or object C. transforms heat energy into cold energy to reduce the temperature of the area to be cooled D. utilizies the cooling effect of compressing a gas to reduce the temperature in a space or object -Correct Answer-A. moves heat energy from a space or object to an area where it can do no harm. Heat energy always flows A. from a substance with more heat energy (measured in BTU's) to a substance with less heat energy (measured in BTU's) B. regardless of temperature C. from an object at a higher temperature to an object at a lower temperature D. from a liquid to a vapor -Correct Answer-C. from an object at a higher temperature to an object at a lower temperature Sensible heat A. is measured using a pressure gauge B. is always between 32 and 212 degrees F C. is heat energy that causes a change in state, but does not cause a change in temperature D. is heat energy that causes a change in temperature, but does not cause a change in state -Correct Answer-D. is heat energy that causes a change in temperature, but does not cause a change in state Latent heat A. is measured using a pressure gauge B. can be sensed by using a thermometer C. is heat energy that causes a change in state, but not a change in temperature D. is heat energy that causes a change in temperature, but does not cause a change in state -Correct Answer-C. is heat energy that causes a change in state, but not a change in temperature Which of the following answers below is an example of heat tranfer by convection? A. the sun's rays B. A rod that is heated on one end resulting in a temperature change at the other end C. Warm air moving over an obect D. Heat transferred to a pan setting on an electric hot plate -Correct Answer-C. Warm air moving over an obect Convection - Th