HVAC Final Exam Electrical For Air Conditioning Accurate 100%(FULL SOLUTIONS PACK!!!)EXAM BUNDLE

A_____is the quantity of heat required to raise the temperature of I lb of water |°F. - ANSWER British thermal unit (BTU) Comfor is typically attained at normal cooling and heating temperatures with a relative humidity of about _____% - ANSWER 50% _________is the movement of air through distr...

1. Where is the heater core located? - ANSWER In the dash 2. In a system with no PTC heater, how is the coolant heated? - ANSWER the engine heats the coolant 3. How is current controlled in a PTC heater? - ANSWER The PTC is Self regulated resistence, Changes with heat and makes it shut off. ...

To control ice build-up on a heat pump outdoor coil in the heating cycle, a ____ is attached to a large diaphragm. - ANSWER Microswitch The heater in the thermostat control circuit in the cooling mode is active when the - ANSWER Cooling contact is open If the suction pressure of a system is 60...

A customer calls with an insufficient cooling compliant. upon arrival to the service call it is found that the outdoor condensing unit is operating, but the indoor blower motor is not in operation. Technician A says that it is possible that it is bad fuse to the furnace Technician B says the con...

What is the function and operation of a reversing valve - ANSWER Reverses refrigerant flow and provides both heating and cooling. Diverts the discharge gas. What are common failures of reversing valves and causes - ANSWER Stuck valve Overheating Bad coil Leaking by from discharge gas flowing b...

Spiral wound gaskets are primarily used on - ANSWER high temperature high pressure systems lip type seals are used primarily - ANSWER on rotating shafts The side force applied at right angles to a bearing and shaft such as that applied from a pulley is called a - ANSWER radial load A type o...

An ampere is - ANSWER A measure of the quality of electrons flowing past a point in the electrical circuit in a given time What part of an atom moves from one atom to another? - ANSWER electron An element in an electric heating unit is applied to a 232-volt power supply. The current flow throu...

sustainability - ANSWER meeting energy needs of today's without detracting from ability of future generations to meet their needs global warming/climate change - ANSWER general rise in average annual global temperature ozone layer depletion - ANSWER loss of ozone molecules in atmosphere resul...

Heating - ANSWER The process of raising the temperature of a space Ventilation - ANSWER The exchange of air between and enclosed space and the outdoors. Air Conditioning - ANSWER The process of lowering the temperature and humidity of a space for human comfort.

Furnace - ANSWER The air flow on most structures that use a fossil fuel for a heat source have a___that would be used as an air supply. Control loop - ANSWER Almost all control systems use a___to control the temperature with in a given structure, space, or zone. Troubleshooting - ANSWER A___ch...

Which unit contains a desiccant to remove moisture from the system? - ANSWER Receiver dryer and Accumulator In a piston type compressor, the pistons are driven by what? - ANSWER Swash plate, Crankshaft or Wobble plate (All of the Above) The basic design of compressors include what? - ANSWER Pi...

A load is an electrical device that _____________________________ - ANSWER uses electricity to do useful work A disconnect switch is used to __________ - ANSWER open and close the main power source to a piece of equipment which of the following are not components of a contactor or relay? - ANS...

A ___ reacts to stop, start, or modulate the flow of water, air, or refrigerant to the system or conditioned space - ANSWER Controlled device All control systems can be subdivided into ____, no matter how many controls there are. - ANSWER Control loops _______ control systems were used before ...

AC is an electron flow that _________________________ - ANSWER alternates back and fourth The ______ is often used as a graphical representation of alternating current - ANSWER sine wave when a conductor rotates through one complete revolution it has generated _____ flow reversals - ANSWER two

Natural Gas Furnace - ANSWER Heating Method most commonly used as a heat source in cold climates Ultraviolet light - ANSWER Device used to maintain indoor air quality transfer heat from the air to the refrigerant - ANSWER purpose of evaporator in refrigerant cycle refrigerant is warmer than...

The total heat content of infiltrated air of the same dry-bulb temperature may vary from one part of the country to another because of the difference in ___. a. solar load b. sensible heat c. humidity d. convection currents - ANSWER c. humidity A homeowner plans to build a house out i...

1. The correct way to short capacitor terminals before checking a capacitor with an ohmmeter is to use a _______ ohm resistor. - ANSWER 20,000 2. Fractionation occurs when __________ - ANSWER some of a blended refrigerant evaporates or condenses before the rest of the blend. 3. Refrigerant in ...

In a (direct expansion) evaporator, liquid refrigerant must boil away as close to the end of the coil as possible in order to: - ANSWER Operate at High Efficiency. What is one of the main reasons that reciprocating compressors are not 100% efficient? - ANSWER Clearance Volume A dirty evaporato...

Defects on gas piping or fittings shall be _____.(A) repaired(B) replaced or repaired and retested(C) repaired by a certified welder(D) ignored, as the operating pressure is much less than the air test. - ANSWER B. Fitting shall be replaced or repaired and retested. UMC Section 1316.4.3 Every abs...

HVACR Practice Test Correct 100% What is the symbol for impedance? a. R b. I c. Z d. P - ANSWER z The safety ground conductor for A/C circuit is usually color coded ________. a. red b. green c. black d. white - ANSWER Green Resistance is _______. a. amperage b. electrical pressu...

In a chiller, the refrigerant boils by ___________. - ANSWER absorbing heat from the water passing through it The four main components of a refrigeration system are - ANSWER compressor, condenser, evaporator, & metering device The difference between a contactor and a motor starter is: - ANSWER...

A listed smoke damper designed to resist the passage of smoke shall be provided at each point in a duct or air transfer opening penetrates a: (A)smoke barrier wall (B)fire rated wall (C)interior wall (D)corridor wall - ANSWER Corridor wall (IMC 607.5.4) Flexible air duct may be what length? (A)10...

Three tons of air conditioning is equal to how many BTUs? - ANSWER 36,000 The liquid line size is _______. - ANSWER 3/8" The discharge line should feel _____ to the touch. - ANSWER slightly warm The compressor should be on a level pad _____ inches above grade. - ANSWER 3 The electrical ...

True - ANSWER Copper wire bend easily, has good mechanical strength, resists corrosion, and can be easily joined. True - ANSWER Aluminum is a good conductor of electricity, however, it has a tendency to corrode. False - ANSWER Voltage drop in a conductor is of least importance when sizing wire...

Evaporator Coil - ANSWER What component of an air conditioning system absorbs heat into the refrigerant Ventilation - ANSWER What does the V stand for in HVAC? Hot Surface Ignition - ANSWER What type of ignition is utilized by the furnaces in the shop? Air Conditioning - ANSWER What is the ...