Nevada HVAC Exam Prep FREE Sample Exam — Fixed Set

Hot-gas bypass gas is introduced directly into the suction line far from the evaporator on a system that then logs oil in the evaporator during long bypass hours. Why can the injection point matter?

Bypass into the distributor or evaporator inlet keeps refrigerant velocity through the coil up, helping oil return, while suction-only injection can leave coil velocity too low

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The injection point never matters, because hot gas entering anywhere in the low side produces identical evaporator velocities and identical oil-return behavior at all loads

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Injecting into the suction line raises evaporator velocity the most, because the gas passes through the entire coil twice before it reaches the compressor inlet

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Injecting at the distributor stops all oil movement in the coil, because the added gas pressure holds the oil stationary against the tube walls during bypass operation

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After a motor sheave is opened to raise airflow by about 20 percent on a belt-drive blower, the motor now trips its overload after an hour of running. What best explains the overload?

The new belt is slightly longer than the old one, and the added belt length alone raises motor current steadily until the overload device opens on every run

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Opening a sheave reduces motor load in all cases, so the trips must come from a failing overload device that should simply be replaced with a larger one

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Fan power rises roughly with the cube of speed, overloading the motor

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The overload trips because higher airflow cools the motor less effectively, since faster supply air bypasses the motor compartment on this style of blower housing

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Tank pressure on a warm afternoon is well over 100 psi, yet the appliances need gas at inches of water column. What does the first-stage regulator in a typical two-stage system do?

It cuts tank pressure to about 10 psi for the yard line

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It raises tank pressure before the second stage, because appliance regulators need a boosted inlet pressure whenever outdoor temperature climbs in the afternoon

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It delivers the final appliance manifold pressure directly, so no second regulation stage is needed anywhere between an outdoor tank and the indoor burners

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It vents excess tank pressure to the atmosphere continuously, holding the yard line at appliance pressure by releasing whatever vapor the tank produces above demand

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A technician sets the closed-position stop on non-calling zone dampers so each blade leaks a small amount of air instead of sealing fully. What is the purpose, and the cost?

The leak prevents damper blades from sticking after long idle periods, and its cost is the motor wear caused by the panel driving the blades against the stop repeatedly

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The bleed relieves some excess pressure, at the cost of conditioning zones that are not calling

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The leak equalizes humidity between zones, and its cost is that satisfied zones slowly take on the moisture load of calling zones through the shared return system

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The bleed raises total airflow so the smallest zone can be served without a bypass, and its cost is that the equipment must be oversized for the whole house to feed the leakage

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A 24 V contactor coil measures 15 ohms. Using Ohm’s law, about how much current does the coil draw when energized?

0.63 A

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1.6 A

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39 A

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360 A

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After responders clear a carbon monoxide incident, what must happen before the gas furnace returns to normal service?

The furnace may restart immediately once the alarm stops, because silence proves the earlier reading was a transient sensor malfunction

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Only the thermostat batteries need changing, since low batteries are the most common cause of genuine carbon monoxide production in furnaces

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A qualified technician must find and correct the source, verify safe combustion and venting, and confirm carbon monoxide is not being produced or spilled.

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The vent connector should be sealed with tape and the furnace run at high fire for an hour to burn out any residue in the heat exchanger

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A straight ladder must reach a roof edge 20 feet above the ground. Using the 4-to-1 setup rule, how far from the building should the ladder base sit?

The base sits 20 feet from the building, found by matching the base distance one-for-one with the working height of the ladder.

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The base sits 10 feet from the building, found by halving the working height to reach the standard setup distance for the ladder.

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The base sits 2 feet from the building, found by allowing one foot of base distance for every ten feet of working height reached.

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The base sits 5 feet from the building.

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Which statement correctly describes how contractor licensing and examinations are handled in Nevada?

The Nevada State Contractors Board administers all examinations itself, and PSI's role is limited to issuing licenses to candidates the Board has approved.

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Eligibility for examination is determined by PSI, and the Nevada State Contractors Board issues licenses only after PSI approves each candidate's experience.

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PSI determines which applicants are eligible for licensure, while the Nevada State Contractors Board only administers the examinations at its own testing centers.

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The Nevada State Contractors Board governs licensing under state law and determines eligibility for examination, while PSI administers the examinations.

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Which statement correctly describes the scope of subclassification C-21b Air Conditioning?

C-21b covers the installation, repair, service and maintenance of equipment using evaporation, refrigeration, boilers or combustion to control air temperatures in structures, including related ductwork and controls.

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C-21b covers only the repair and replacement of parts of existing air-conditioning units, and it never covers new equipment installation work.

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C-21b covers the fabrication and installation of sheet metal products, including ducts, louvres, patented chimneys and metal roof systems for buildings, together with the fabrication and installation of metal roof systems, patented chimneys, flashings and gutters for those structures.

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C-21b covers controlling air temperatures below 50 degrees Fahrenheit in refrigerators, refrigerated rooms and insulated storage spaces only.

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An estimator adds a modest contingency line inside a bid for a retrofit with concealed conditions. What is the contingency meant to cover?

Reasonable unforeseen conditions within the defined scope

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The contractor's entire annual overhead shortfall if billable hours fall below the forecast for the year

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Profit the contractor wants to protect even if no additional cost of any kind is ever encountered

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Work the owner has already described as a definite extra that should be listed as a separate line item

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SCENARIO: A technician’s gross wages for a week are $1,600. The employer’s payroll burden given for that week — employer payroll taxes, workers’ compensation and benefits combined — totals 25 percent of gross wages. What is the employer’s total labor cost for that technician for the week?

The total labor cost is $2,400, since the burden adds 50 percent of gross wages to the week's payroll.

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The total labor cost is $2,000, since the burden adds $400 to the $1,600 in gross wages.

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The total labor cost is $1,600, since the burden is withheld from the technician's own paycheck in full.

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The total labor cost is $1,840, since the burden adds 15 percent of gross wages to the amount the technician earns that week, and the remaining share of the burden is billed to the customer as a separate direct charge.

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A duct section drawing gives the bottom of a main at 9 feet 6 inches above the floor, and the reflected ceiling plan shows a ceiling at 9 feet. The electrical plan places light fixtures in the same bay. What problem does comparing these drawings reveal?

No problem exists, because ductwork drawn above a ceiling line can always pass through light fixtures as long as the fixtures are recessed types

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The ceiling must be raised above the duct by the ceiling contractor without any coordination, since ceiling height always yields to mechanical drawings

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The fixtures are at fault by default, because electrical drawings are drawn last and therefore carry the lowest priority in every space conflict on a project

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Only 6 inches separate duct bottom from ceiling, leaving a tight coordination zone

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Nevada HVAC Exam Prep FREE Sample Exam — Fixed Set

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