Chapter 25 Installation and Troubleshooting of Domestic Refrigerators and Freezers 667 Copyright Goodheart-Willcox Co., Inc. 8 4. What is the main reason not to use an extension cord to connect a refrigerator to an outlet? A. An extension cord cannot provide an adequate ground. B. An extension cord may cause an unacceptable voltage drop. C. An extension cord removes overload protection of the circuit. D. All of the above. 5. How much air space must be provided around all sides of a refrigerator or freezer with a hot-wall condenser? A. 2″ (51 mm) B. 6″ (154 mm) C. 12″ (307 mm) D. 24″ (614 mm) 6. If a refrigerator will not start and the interior light does not come on when the door is opened, which of the following is the most likely cause of the problem? A. A problem in the motor control circuits. B. A mechanical problem in compressor. C. A problem in the electrical supply circuit. D. Excessive head pressure. 7. Which of the following conditions can cause a buildup of frost on an evaporator? A. A leaky door gasket. B. A clogged metering device. C. A clogged filter-drier. D. A dirty condenser. 8. Which of the following would prevent a newly installed ice maker from operating properly? A. The signal arm is in the down position. B. The temperature of the ice mold does not drop below 20°F (–7°C). C. The thermostat is wired in series with the mold heater. D. All of the above. 9. Which of the following affects a refrigerator or freezer cycling time? A. Amount of storage space inside the cabinet. B. Temperature outside the cabinet. C. Compressor condition. D. All of the above. 10. If a refrigerator-freezer operates, but the cabinet is too warm, which of the following is the most likely cause? A. The compressor motor is running in reverse. B. The evaporator is iced over. C. A problem with the electrical supply circuit. D. A problem with the mullion heater. 11. Wires used for grounding are usually _____. A. black B. green C. red D. white 12. Which of the following is the best test a technician can perform to see if the thermostat is the cause of a no-start condition? A. Bypass the thermostat. If the system does not start, the problem is in the thermostat. B. Bypass the thermostat. If the system starts, the problem is in the thermostat. C. Turn the thermostat to its highest setting. If the system does not start, the problem is in the thermostat. D. Turn the thermostat to its lowest setting. If the system does not start, the problem is in the thermostat. 13. Which of the following conditions can result in frost on the suction line? A. An insufficient refrigerant charge. B. An overcharge of refrigerant. C. A partially clogged metering device. D. All of the above. 14. A _____ is a small length of sealed tubing that extends out through a compressor housing and is used to service the system. A. discharge stub B. process tube C. suction tube D. valve adapter 15. A system has symptoms corresponding to a restriction in the metering device, but begins working properly again when heat is applied to the metering device. Which of the following is the most likely cause? A. Leaking compressor valves. B. Moisture in the system. C. Shortage of refrigerant. D. Wax buildup clogging the metering device.