TeeGrades

<question: The density of air is A: How much air weighs per cubic foot B: How much volume one pound of air occupies C: The ratio of the weight of water to that of the same volume of water D: The ratio of the amount of water vapor contained in a cu. ft. of air to the amount of moisture held at saturation - A: How much air weighs per cubic foot The specific volume of air is A: How much air weighs per cubic foot B: How much volume one pound of air occupies ...

What method of heat transfer does not require fluids or solids? - Radiation (heat waves) Capillary tubing should only be cut to length using a - triangular knife edge file Before beginning any electrical checkout procedure, what step must always be taken after the equipment disconnect or circuit breaker has been turned off? - When making a flare, the height of the tubing above the flaring block is critical because a flare with too much starting height will - not fit into th...

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% - C: 78% Many pre-1992 furnaces have efficiencies around _______. A: 10% B: 40% C: 60% D: 80% - C: 60% Today, furnaces with AFUE ratings greater than _____ are available. A: 85% B: 90% C: 100% D: 110% - B: 90% A thermocouple is used with: A: Interm...

What method of heat transfer does not require fluid or solids? - Radiation Capillary tubing should only be cut to length using a - Triangular or knife edge file Before beginning any electrical check out procedure what step must always be taken after the equipment disconnect or circuit breaker has been turned off - Check for voltage When making a flare the height of the tubing above the flare block is critical because the flare with too much starting height will ______ - Will...

What are the five basic components to any schematic? - 1. 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 abbreviations used in the schematic mean. What are the three basic types of wiring diagrams used in the HVACR trade? - 1. The ladder diagram 2. The pictorial diagram 3. The installation diagram Describe the...

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 charge for the system? A. 6 ounces B. 5 pounds C. 5 pounds 10 ounces D. 6 pounds - D. 6 pounds 15ft - 25ft = 10ft x .6 = 6 ounces 5 pounds + 10 ounces + 6 ounces 5 pounds + 16 ounces = 6 po...

The primary purpose of using flux when soldering copper or brass parts is to: prevent oxidation. Light commercial outdoor condensing units that are installed in geographic areas where snowfalls can be heavy must be mounted: with wind barriers on all sides. Proper ductwork connections and sealing is critical to good system performance. Conditions are: Return side air leak of 15 % in a ventilated attic 2.5 ton system rated at 1,000 CFM. Attic Air 95°F The loss in delivered capacity is...

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 - 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 judgment - An opinion is Easy to use - Which of the following is a future of a product or service A truth - A fact is Saves time - Which of the following is a benefit of a product or service DOT - Which of the following agencies has jurisdiction over the shipping and labeling of refrigerant cylinders? The flow of electrons through a conductor - Electricity is Electrical pressure - Voltage in an energized electrical circuit can be thought of as A curren...

What electro-mechanical control would you use on a cap tube or automatic expansion valve system to maintain the space temperature? - C: A thermostatic control Open motors are designed to operate at a given temperature rise as indicated on the motor nameplate. What does this mean? - A: indicates the temp. rise over the surrounding air of a motor when the motor is operating at full-load conditions A voltmeter is connected into a circuit in which of the following ways? - B: Parallel ...

One horsepower is equal to what? - 746 watts. One watt=3.413 BTUs per hour. Power=I times E and BTUs equal P times 3.413 Direct current flows how? - In one direction, only from a negative to a positive potential 60 Hz. means what? - Current, within a circuit, changes direction 120 times per second Electrical circuits contain what? - Voltage source, connecting wiring, loads and switches Poles means what? - This describes the number of contacts that the switch has. Each ...

On an R-22 system, line diameters and lengths are typically specified for a vapor pressure drop that does not exceed what? - 6-7PSI or 6F What is the primary purpose of using flux when soldering copper or brass parts? - Prevent Oxidation The water that results from a defrost cycle of an air to air heat pump(runoff) must? - Drain off and away from the outdoor coil. Why must the runoff be drained off and away from the outdoor coil? - Excessive ice can build up on the bottom of...

Which of the following factors affects a customer's level of comfort? a. Air movement b. Humidity c. Temperature d. All of the above - d (All of the above: air movement, humidity, temperature) A cooling load calculation estimates the sensible heat gain of a structure. The maximum sensible capacity of a cooling-only system should be within ____% of this calculated value. a. ±10% b. +10% c. +15% d. +30% - c (+15%) The maximum sensible cooling capacity of a heat pump shoul...

Heat Anticipators - Are wired in series Cooling anticipators - Are wired parallel Low pressure switches detects - a loss of refrigerant Low pressure switches de energizes - the compressor Electronic air cleaners do not - remove odors Electronic air cleaners normally are - 4000 to 8000 dc volts Air handlers above a ceiling have to have - a secondary pan Latent heat - changes the state of a substance but not the temp Always size a heat pump - By t...

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 - A: Liquid flood-back to the compressor Which of the following is the correct sequence of work? A: Attach gauge manifold, recover refrigerant, replace filter core, evacuate the system, recharge the system. B: Recover refrigerant, evacu...

Ch. 1-1 The ability to utilize all types of communication skills is ________ to the HVACR technician. a) not as important as "hands-on" technical skills b) somewhat important c) unimportant d) very important - d) very important Ch. 1-2 It is important to be _______ in filling out service orders so that office staff, other technicians, and customers will know what work you completed on the job. a) clear b) complete c) concise d) all of the above - d) all of the above Ch. 1...

NYS EMT Practice Test Questions with Correct Solutions Exam Bundle

ACLS Exam Questions with Correct Solutions Exam Bundle

An air conditioning technician is working in the basement of a large B37public building. The technician notices several unsafe and dangerous conditions. Of the following conditions that are noticed, which is the most dangerous and should be reported immediately? A: Gas leaking from a cracked pipe B: An open sewer drain connection C: The basement is unlighted D: None of these are the technician's business - A: Gas leaking from a cracked pipe A service technician is retu...

Class A - Ordinary Extinguisher Class B - Liquid Extinguisher Class C - Electrical Extinguisher Asphyxiation causes what? - Nausea, Dizziness, Heart Irregularities, and Unconciousness Ladder must be at what dimensions in relation to a house? - 4 ft for every 1 ft, 3 ft above the top of the roof. What different amounts does Copper Tubing come in? - 25, 50, 100 Soft drawn copper tubing means what? - Copper tubing that is on a roll Hard drawn copper tubing ...