NATE Heat Pump Exam correctly answered latest 2023

NATE Heat Pump Exam correctly answered latest 2023Charging a heat pump with refrigerant is best accomplished in the _______ mode. A: Heating mode B: Cooling mode C: Defrost mode D: Emergency heating mode B: Cooling mode Heat pumps can provide both heating in the winter and cooling in the summer. In which mode is the heat pump more efficient? A: Heating mode B: Cooling mode C: Defrost mode D: Emergency heating mode A: Heating mode Which of the following components is exclusive to the heat pump? A: Condenser B: Oil separator C: Reversing valve D: Accumulator C: Reversing valve Which of the following airflow rates is the most reasonable for a heat pump system operating in the heating cycle? A: 200 cfm per ton B: 300 cfm per ton C: 400 cfm per ton D: 450 cfm per ton D: 450 cfm per ton During the heat pump's cooling cycle, the outdoor coil is utilized as a _________ while the indoor coil is utilized as a____________. A: Condenser, evaporator B: Evaporator, condenser C: Compressor, accumulator D: Accumulator, condenser A: Condenser, evaporator Heat is present in winter outdoor air until the outside air ambient temperature reaches a low temperature of: A: 0 degrees F B: 32 degrees F C: 273 degrees F D: -459 degrees F D: -459 degrees F Technically this is true, but not practical. A heat pump is doing good to continue to work below 10 deg F. The heat pump utilizes: A: Two filter-driers with check valves B: One bi-flow filter-drier C: A single mono-flow filter-drier in the liquid line D: Some use the bi-flow filter-drier and others use two filter-driers with check valves D: Some use the bi-flow- filter-drier and others use two filter-driers with check valves The correct way to size a heat pump is to perform both heating and cooling load calculations and select the heat pump size by: A: Adding the heating load and cooling loads B: Subtracting the smaller load from the larger load C: Using the heating load to size the system D: Using the cooling load to size the system D: Using the cooling load to size the system Auxiliary electric heat is necessary because: A: It provides heat for the home during defrosts B: It provides heat for the home in the event of a heat pump failure C: It provides heat for the home if the heat pump is unable to meet the demand for heat D: All of the above D: All of the above Reading a voltage across the contacts of the outdoor thermostat means: A: The thermostat contacts are closed B: The thermostat contacts are open C: The thermostat contacts are stuck D: The thermostat contacts are working correctly B: The thermostat contacts are open Which of the following is not a type of heat pump? A: Ground to air B: Air to air C: Water to air D: Direct coupled D: Direct coupled The coefficient of performance is determined by: A: Dividing the output btuh by the input btuh B: Dividing the input btuh by the output btuh C: Multiplying the input by the output D: Subtracting the output from the input B: Dividing the input btuh by the output btuh The "balance point" of a heat pump is: A: The lowest temperature at which the heat pump can meet the heating requirement for the structure B: The lowest temperature at which the heat pump can operate C: The temperature at which the heat pump has the highest efficiency D: The point at which the heating and cooling loads meet A: The lowest temperature at which the heat pump can meet the heating requirement for the structure Which of the following is an incorrect term for the solenoid valve that switches the heat pump between the heating and cooling modes? A: Changeover valve B: Reversing valve C: Four-way valve D: Discharge operator valve D: Discharge operator valve The best location for the outdoor section of an air to air heat pump is: A: Where it gets the winter sun B: Where it is sheltered from the sun's radiation C: Where it never snows D: Under the shelter of a porch A: Where it gets the winter sun What may happen if the body of a reversing valve is slightly dented? A: Nothing, as they are made to be very durable B: The internal slide may stick C: The valve may make noises from the gas trying to pass through partially open ports D: Both b and c are correct D: Both b and c are correct The reversing valve has 4 pipe connections. One pipe connection is on one side of the valve and three pipe connections are on the opposite side. What is the center connection on the side with three pipe connections? A: Compressor suction connection B: Compressor discharge connection C: Outdoor coil connection D: Indoor coil connection A: Compressor suction connection The reversing valve has 4 pipe connections. One pipe connection is on one side of the valve and three pipe connections are on the opposite side. What is the single connection on the side opposite the three connections? A: Compressor suction connection B: Compressor discharge connection C: Outdoor coil connection D: Indoor coil connection B: Compressor discharge connection Why are reversing valves pilot operated? A: Because pilot operated valves use the differential pressure to operate the valve ports instead of having a solenoid valve working against the head pressure B: Because that is just the way they are made C: Pilot operated valves are quiet D: Heat pump reversing valves are NOT pilot operated! A: Because pilot operated valves use the differential pressure to operate the valve ports instead of having a solenoid valve working against the head pressure Two technicians are working on a heat pump system and are preparing to evacuate the system. Technician A says that in order to pull a good vacuum the reversing valve needs to be switched on and off during the evacuation so air and moisture are not trapped in the system. Technician B says technician A is incorrect and that the reversing valve will not switch with the system in a vacuum anyway. Who is correct? A: Technician A is correct B: Technician B is correct C: Both technicians A and B are correct D: Both technicians A and B are incorrect B: Technician B is correct Terminal "O" on a heat pump thermostat is used for: A: Operating the reversing valve B: Operating the indoor fan motor C: Operating the compressor D: Operating the condenser fan motor A: Operating the reversing valve Terminal "G" on a heat pump thermostat is used for: A: Operating the reversing valve B: Operating the indoor fan motor C: Operating the compressor D: Operating the condenser fan motor B: Operating the indoor fan motor A typical 3 ton split system residential heat pump would have auxiliary electric heating elements of about how many watts total? A: 4 kw B: 5 kw C: 15 to 20 kw D: 40 to 60 kw C: 15 to 20 kw Typical slide-in packages of electric heating elements come in units of how many kilowatts each? A: 1 to 2 kw B: 3 to 6 kw C: 15 kw D: 25 kw B: 3 to 6 kw When a typical heat pump goes into defrost which of the following will occur? A: Compressor shuts off, reversing valve switches to cooling, defrost heaters energized and outdoor fan stops B: Compressor remains on, outdoor fan stops and auxiliary electric elements are energized C: Indoor and outdoor fans fun at higher speed, compressor remains on auxiliary and electric elements remain off D: Auxiliary electric elements operate at reduced voltage, compressor runs at half speed and outdoor fan shuts off A: Compressor shuts off, reversing valve switches to cooling, defrost heaters energized and outdoor fan stops What function does a Ranco E15 control serve? A: It is a common, combination time and temperature defrost control B: It is a mechanical defrost timer with a builtin thermostatic control C: It is a defrost control that checks outdoor coil for frost buildup every 30, 45 or 90 minutes D: All of the above are correct D: All of the above are correct This control is all but obsolete