Docsity
Log inSign up
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Docsity AI
Docsity AI
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search for your university

Find the specific documents for your university's exams

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

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

Stanford UniversityMechanical Engineering

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

Typology: Exams

2025/2026

Available from 02/27/2026

eliteminds
eliteminds 🇺🇸

5

(1)

3.1K documents

1 / 16

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
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.
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff

Partial preview of the text

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.