Air Conditioning and Refrigeration Troubleshooting Control Questions PDF

Air Conditioning and Refrigeration Troubleshooting Handbook Control Questions – 3 1. The defrost termination point is the __________. A. Temperature at which the defrost period ends B. Point at which the defrost period ends C. Point when all the frost...

Air Conditioning and Refrigeration Troubleshooting Handbook Control Questions – 3 1. The defrost termination point is the __________. A. Temperature at which the defrost period ends B. Point at which the defrost period ends C. Point when all the frost has melted D. Point when the system returns to normal operation 2. Start and run capacitors can be connected either in __________ to provide the desired characteristics if the voltage and MFD are properly selected. A. Series or dual phase B. Series or parallel C. Dual phase D. Split phase 3. __________ is not a type of main burner. A. Inshot B. Inset C. Slotted port D. Ribbon 4. The __________ of an oil failure control unit (used to protect a compressor from improper lubrication) is based on 120- or 240-volts ac applied in an ambient temperature of 75°F with the cover in place. A. Sensitivity B. Reading C. Time delay D. Sequencing 5. When the 24 VAC common wire from the indoor blower is connected to terminal __________ and not one of the staging terminals, the electric heat will come on when the second stage of the indoor thermostat calls for heat. A. B B. G C. O D. X 6. Heat pump defrost controls are used to detect __________ on the outdoor coil during the heating cycle. A. Ice and frost B. Heat C. Air flow D. THX operation 7. During the winter months a desired relative humidity should be between __________. A. 30% and 50% B. 40% and 60% C. 50% and 70% D. 60% and 80% 8. A plugged capillary tube is caused by __________. A. Excessive airflow B. Trapped foreign particles C. Untrappped foreign particles D. Low head pressure 9. The heat pump is in the heating cycle. The compressor short cycles. The most probable cause is __________. A. The defrost control is out of adjustment B. A defective relay C. Faulty wiring or loose terminals D. Faulty outdoor fan relay 10. Current flow is easily determined using a/an __________. A. Ammeter B. Ohmmeter C. Wattmeter D. Voltmeter 11. Oil pressure failure controls are designed to stop the compressor in __________ minute(s). A. 1 B. 2 C. 3 D. 4 12. The maximum clearance between the walls of the inner and outer tubes should not exceed __________ - inch. A. ½ B..05 C..001 D..005 13. When the hot gas type of defrost is involved, a __________ valve is used to direct the flow of hot gas around the flow control device. A. Bi B. Solenoid C. Adenoid D. Riser 14. Starting capacitors found to be out of the range of __________ of the mfd rating of the capacitor must be replaced. A. 0% to +20% B. 5% to +20% C. 5% to +25% D. 10% to +30% 15. A __________ may be installed to help in solving a low amperage draw in the thermostat circuit. A. Isolation relay B. Shunt resistor C. Conductor D. Capacitor 16. The terminal that is the most likely to short is the one with the __________. A. Red dot B. Double clip C. Plus sign D. Minus sign 17. A burned-out defrost valve solenoid coil will prevent operation of the __________. A. Defrost circuit B. THX valve C. Solenoid coil D. Hot gas bypass line ****Please see Answer Key on the following page**** ABC 09/29/2021  Air Conditioning and Refrigeration Troubleshooting Handbook Control Questions – 3 Answer Key Answer Page # 1. A 73 2. B 362 3. B 110 – 111, Figure 1-147 - Types of main burners 4. C 22 5. A 181 6. A 131 7. B 104 8. C 56 9. A 449 10. A 7 11. B 22 12. D 308 13. B 74 14. A 32 15. B 153 16. A 34 17. A 74