WISCONSIN DSPS HVAC QUALIFIER EXAM — PRACTICE EXAMINATION NEWEST 2026 UPDATE 100 ACTUAL, Exams of Mechanical Engineering

WISCONSIN DSPS HVAC QUALIFIER EXAM — PRACTICE EXAMINATION NEWEST 2026 UPDATE 100 ACTUAL QUESTIONS & CORRECT ANSWERS | ALREADY GRADED A+

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2025/2026

Available from 02/27/2026

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WISCONSIN DSPS HVAC QUALIFIER EXAM — PRACTICE
EXAMINATION NEWEST 2026 UPDATE 100 ACTUAL
QUESTIONS & CORRECT ANSWERS | ALREADY GRADED
A+
Most-Tested Content Areas:
HVAC system design • Load calculations • Duct design • Refrigeration
cycle • Electrical fundamentals • Controls • Fuel gas systems • Venting
& combustion air • Wisconsin codes & safety • Installation standards •
Troubleshooting • Hydronics • Energy efficiency
1. The process used to determine the heating and cooling
requirements of a building is called ________.
Answer: Load calculation
This determines the BTU/hr needed to maintain indoor
design conditions.
2. The refrigerant component that rejects heat to the outdoors is the
________.
Answer: Condenser
Heat absorbed indoors is released outside through the
condenser coil.
3. The device that reduces refrigerant pressure before entering the
evaporator is the ________.
Answer: Expansion valve
It meters refrigerant flow and creates the pressure drop
needed for evaporation.
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Download WISCONSIN DSPS HVAC QUALIFIER EXAM — PRACTICE EXAMINATION NEWEST 2026 UPDATE 100 ACTUAL and more Exams Mechanical Engineering in PDF only on Docsity!

WISCONSIN DSPS HVAC QUALIFIER EXAM — PRACTICE

EXAMINATION NEWEST 2026 UPDATE 100 ACTUAL

QUESTIONS & CORRECT ANSWERS | ALREADY GRADED

A+

Most-Tested Content Areas: HVAC system design • Load calculations • Duct design • Refrigeration cycle • Electrical fundamentals • Controls • Fuel gas systems • Venting & combustion air • Wisconsin codes & safety • Installation standards • Troubleshooting • Hydronics • Energy efficiency

  1. The process used to determine the heating and cooling requirements of a building is called ________. Answer: Load calculation

This determines the BTU/hr needed to maintain indoor

design conditions.

  1. The refrigerant component that rejects heat to the outdoors is the ________. Answer: Condenser

Heat absorbed indoors is released outside through the

condenser coil.

  1. The device that reduces refrigerant pressure before entering the evaporator is the ________. Answer: Expansion valve

It meters refrigerant flow and creates the pressure drop

needed for evaporation.

  1. The evaporator’s primary function is to ________. Answer: Absorb heat

Low-pressure refrigerant absorbs heat from indoor air as it

evaporates.

  1. Superheat is measured at the outlet of the ________. Answer: Evaporator

Superheat confirms that only vapor returns to the

compressor.

  1. Subcooling is measured at the outlet of the ________. Answer: Condenser

It verifies that liquid refrigerant is fully condensed.

  1. The device that protects a compressor from excessive current is the ________. Answer: Overload protector

It opens the circuit when current exceeds safe limits.

  1. A thermostat is a type of ________ control device. Answer: Temperature

It responds to changes in air temperature.

  1. The minimum required oxygen level for proper combustion is supplied by ________. Answer: Combustion air

Adequate air prevents incomplete combustion and carbon

monoxide.

  1. In a gas furnace, ignition of the burners is initiated by the ________.
  1. The primary safety device preventing furnace overheating is the ________. Answer: Limit switch

It shuts down burners if temperature exceeds safe levels.

  1. Carbon monoxide is dangerous because it is ________. Answer: Colorless and odorless

It can accumulate undetected and is highly toxic.

  1. Electrical power is calculated as voltage multiplied by ________. Answer: Current

Power (watts) = volts × amps.

  1. The unit of electrical resistance is the ________. Answer: Ohm

Resistance opposes current flow.

  1. A transformer changes voltage using ________. Answer: Electromagnetic induction

Primary and secondary windings transfer energy

magnetically.

  1. The common control voltage in residential HVAC systems is ________. Answer: 24 volts

Low-voltage circuits control relays and contactors.

  1. The device that starts and stops a compressor motor is the ________.

Answer: Contactor

It switches high-voltage power using a low-voltage coil.

  1. Refrigerant oil returns to the compressor through the ________. Answer: Suction line

Oil circulates with refrigerant vapor.

  1. The process of removing air and moisture from a system is called ________. Answer: Evacuation

Performed using a vacuum pump before charging.

  1. Refrigerant leaks are commonly detected using an electronic ________. Answer: Leak detector

Sensitive instruments locate escaping refrigerant.

  1. The piping that carries high-pressure liquid refrigerant is the ________. Answer: Liquid line

Runs from condenser to expansion device.

  1. The piping that carries low-pressure vapor refrigerant is the ________. Answer: Suction line

Returns vapor to the compressor.

  1. A furnace with an AFUE of 90% converts 90% of fuel into ________.
  1. Refrigerant classification based on toxicity and flammability is defined by ________. Answer: ASHRAE

ASHRAE Standard 34 assigns safety groups.

  1. The pressure-temperature relationship of refrigerants is shown on a ________. Answer: PT chart

Used to determine saturation temperatures.

  1. The dew point is the temperature at which air becomes ________. Answer: Saturated

Moisture begins to condense.

  1. Return air ducts should not draw air from ________. Answer: Mechanical rooms

To avoid combustion gases entering the system.

  1. A filter’s effectiveness is rated by its ________. Answer: MERV rating

Higher values capture smaller particles.

  1. Excessive refrigerant charge can cause ________. Answer: High head pressure

Overfilling increases condenser pressure.

  1. Insufficient airflow across an evaporator can cause ________. Answer: Ice formation

Low airflow reduces heat absorption and coil temperature.

  1. The device that senses flame presence is the ________. Answer: Flame sensor

Shuts gas valve if flame is not detected.

  1. Lockout occurs when a control system detects repeated ________. Answer: Faults

Prevents unsafe operation until reset.

  1. The minimum efficiency standards for HVAC equipment are regulated by ________. Answer: Federal law

DOE sets nationwide efficiency requirements.

  1. The purpose of a trap in condensate piping is to ________. Answer: Prevent air leakage

Maintains proper drainage and airflow balance.

  1. Variable speed motors improve efficiency by adjusting ________. Answer: Airflow

They match output to demand.

  1. Refrigerant recovery is required to protect the ________. Answer: Environment

Prevents release of ozone-depleting or greenhouse gases.

  1. Proper grounding protects against electrical ________. Answer: Shock

Provides a safe path for fault current.

Answer: Pressure switch

Shuts down system to protect against unsafe pressures.

  1. A three-phase compressor motor is typically started using a ________. Answer: Contactor with overload protection

Ensures safe operation and prevents motor damage.

  1. The minimum combustion air opening for a room-sealed appliance must be ________. Answer: Direct to outside

Provides adequate oxygen for complete combustion.

  1. When measuring airflow, the most accurate instrument is a ________. Answer: Velometer or anemometer

Measures air velocity at the duct.

  1. The device that prevents reverse flow of gases in a flue is the ________. Answer: Draft hood or damper

Protects appliance and home from backdrafting.

  1. A refrigerant with low ozone depletion potential is classified as ________. Answer: HFC

Hydrofluorocarbons are ozone-friendly substitutes.

  1. Proper duct sealing improves efficiency and reduces ________.

Answer: Energy loss

Leaks waste conditioned air and increase costs.

  1. The device used to measure static pressure in a duct system is a ________. Answer: Manometer

Measures inches of water column accurately.

  1. The blower wheel in a furnace moves air across the ________. Answer: Heat exchanger

Transfers heat to the conditioned space.

  1. Safety codes require gas piping to be pressure-tested at ________. Answer: 10 psi

Ensures leak-free installation before operation.

  1. The component that limits fan speed to prevent overheating is the ________. Answer: Fan limit switch

Protects the motor and equipment.

  1. An improperly sized duct system can cause ________. Answer: Excessive noise

Undersized ducts increase velocity, oversized reduce

efficiency.

  1. A boiler’s relief valve prevents ________. Answer: Overpressure

Protects the system from dangerous pressure build-up.

  1. The component that senses water temperature in a boiler is the ________. Answer: Aquastat

Controls boiler operation based on set temperature.

  1. A heat pump in defrost mode temporarily reverses the ________. Answer: Reversing valve

Switches system to cooling to melt frost.

  1. The refrigerant line that runs from the evaporator to the compressor is the ________. Answer: Suction line

Carries low-pressure vapor back to the compressor.

  1. To prevent electrical shock, all metal parts must be ________. Answer: Grounded

Provides safe path for fault current.

  1. The pressure drop in a duct system affects ________. Answer: Airflow

Higher static pressure reduces air volume delivered.

  1. Gas burners should be adjusted to produce a ________ flame. Answer: Blue

Indicates complete combustion.

  1. In hydronic systems, water temperature is controlled using the ________.

Answer: Aquastat or mixing valve

Maintains desired heating temperature.

  1. Excessive refrigerant in a system can cause ________. Answer: Compressor flooding

Liquid refrigerant entering the compressor can cause

damage.

  1. The primary purpose of a condensate trap is to ________. Answer: Prevent air leakage

Maintains airflow and proper drainage.

  1. A heat exchanger cracked by overheating is a hazard because it can release ________. Answer: Carbon monoxide

Toxic gas leaks into indoor air.

  1. The flue vent must be sized based on the appliance ________. Answer: BTU input

Ensures proper draft and safe combustion.

  1. A refrigerant receiver stores ________. Answer: Excess liquid refrigerant

Balances supply for system demands.

  1. Hydronic system balancing is achieved using ________. Answer: Flow control valves

Ensures equal distribution to all zones.

  1. A gas appliance must have a shutoff valve within ________ of the appliance.
  1. Thermostatic expansion valves respond to ________. Answer: Superheat at the evaporator outlet

Regulates refrigerant flow to maintain desired superheat.

  1. The proper way to evacuate a refrigerant system is using a ________. Answer: Vacuum pump

Removes air and moisture before charging.

  1. Duct leakage can result in ________. Answer: Energy loss and uneven temperature

Leaks reduce system efficiency and comfort.

  1. Combustion air openings must be sized according to ________. Answer: Appliance BTU rating

Ensures adequate oxygen for complete combustion.

  1. A condensate pump is required when ________. Answer: Gravity drainage is not possible

Pumps water to a proper drain point.

  1. Refrigerant charging must be done according to ________. Answer: Manufacturer specifications

Ensures correct performance and prevents damage.

  1. The purpose of personal protective equipment is to ________. Answer: Reduce risk of injury

Includes gloves, goggles, respirators, and other safety gear.