NATE Core practice bundled exams 2023 with 100% correct answers

Low airflow over a residential split system air conditioning evaporator can cause A: Liquid flood-back to the compressor B: A decrease in compression ratio C: An increase in suction line superheat D: Oil logging in the evaporator correct answersA: Liquid flood-back to the compress...

what type of meter is most appropriate when a tech must determine voltage? correct answersvoltmeter temp at which moisture begins to condense on objects? correct answersdew point btu's equivalent to 1 watt hour A. 3.418 B. 3.413 C. 3.213 D. 4.314 correct answers3.413 btu electrical tes...

a (Centrifugal) correct answersWhich of the following compressors are considered a dynamic compressor? a. Centrifugal b. Reciprocating d. Rotary c. Scroll b (Superheated vapor / sub cooled liquid) correct answersWhat is the condition of the refrigerant as it enters and leaves the condensing...

A judgment correct answersAn opinion is Easy to use correct answersWhich of the following is a future of a product or service A truth correct answersA fact is Saves time correct answersWhich of the following is a benefit of a product or service DOT correct answersWhich of the following a...

formula to convert celsius to fahrenheit correct answersF = (1.8 x C) + 32 formula to convert fahrenheit to celsius correct answersC = .56 (F - 32) specific heat correct answersthe amount of heat required to raise 1 lb of a substance 1 degree fahrenheit sensible heat correct answersIs the h...

Charging a heat pump with refrigerant is best accomplished in the _______ mode. A: Heating mode B: Cooling mode C: Defrost mode D: Emergency heating mode correct answersB: Cooling mode Heat pumps can provide both heating in the winter and cooling in the summer. In which mode is th...

A system is supplied from the factory with charge of 5 pounds 10 ounces for a 15 foot line set. The line set is 25 feet long. The manufacturer's instruction sheet specifies 0.6 ounces of refrigeration to be added for each added foot of refrigerant line set length. What is the total refrigerant char...

Since 1992, the United States Department of Energy has required that all furnaces sold and installed from that date on must have an AFUE of no less than: A: 70% B: 75% C: 78% D: 80% correct answersC: 78% Many pre-1992 furnaces have efficiencies around _______. A: 10% B: 40...

What are the five basic components to any schematic? correct answers1. A power supply 2. A path for the power 3. A load or component that operates from the power. 4. A switch or component that interrupts the power to the load. 5. A legend or key that explains what the various symbols and abbrevi...

Generally, vibration eliminators in piping should be installed: A: At a 45 degree angle B: At a 90 degree angle C: Perpendicular to the compressor crankshaft D: Parallel to the compressor crankshaft correct answersD: Parallel to the compressor crankshaft If you purchased ten filt...

What electro-mechanical control would you use on a cap tube or automatic expansion valve system to maintain the space temperature? correct answersC: A thermostatic control Open motors are designed to operate at a given temperature rise as indicated on the motor nameplate. What does this mean? cor...

What kind of heat transfer does not include solids, or fluids correct answersRadiation Capillary tubing should be only cut to length using correct answersTriangular or knife edge file Before beginning any electrical check out procedure, what step should be taken after equipment is disconnected...

Class A correct answersOrdinary Extinguisher Class B correct answersLiquid Extinguisher Class C correct answersElectrical Extinguisher Asphyxiation causes what? correct answersNausea, Dizziness, Heart Irregularities, and Unconciousness Ladder must be at what dimensions in relation to a h...

The Fahrenheit scale is based on boiling water at sea level at what temperature? A: 459 degrees B: 212 degrees C: 180 degrees D: 100 degrees correct answersB: 212 degrees Zero pounds gauge corresponds on the absolute scale to: A: 144 B: 212 C: 14.7 D: zero ...