HVAC and Lightening quick quiz

Multiple Choice

Where is the safest place to be during a thunderstorm?

Multiple Choice

What are the five major devices in HVAC systems that provide environmental control?

• Heating, cooling, filtering, ducting, and venting units

• Heating/cooling units, humidifiers/evaporative coolers, dehumidifiers, air exchangers/ventilators, and filters/electronic air cleaners

• Temperature control, moisture control, air flow, filtration, and heating elements

• Furnace, air conditioner, thermostat, ducts, and filters

Multiple Choice

What is lightning?

Multiple Choice

Lightning is very hot!

Multiple Choice

What colour is lightning?

Multiple Choice

Use Ohm’s Law to calculate: A 24V battery is connected to a circuit with a resistance of 600Ω. What is the current?

• 40A

• 0.04A

• 2.5A

• 144A

Multiple Choice

You can see thunder.

Multiple Choice

You can see lightning.

Multiple Choice

What's the weather like?

• It's stormy.

• It's sunny.

• It's snowy

Multiple Choice

What does this image represent?

• Fog

• Thunderstorm

• Rain

• windy

Multiple Choice

What is this?

• breeze
• thunder
• shower

Multiple Choice

Which of the following is NOT a common energy source used for temperature control in HVAC systems?

• Natural gas

• Electricity

• Hydrogen

• Solar energy

Multiple Choice

WHICH WORD BETTER DESCRIBES THE PICTURE?

• BLIZZARD

• LIGHTNING

• FOG

Multiple Choice

WHICH WORD BETTER DESCRIBES THE PICTURE?

• THUNDER

• HEAVY RAIN

• HAIL

Multiple Choice

What is the primary advantage of fuel oil as a heating source?

• It's the most environmentally friendly option

• It's the least expensive fuel source

• It provides a great deal of heat for its weight and leaves no ash

• It's the most commonly available energy source

Multiple Choice

What unit is used to measure the amount of electric charge?

• Ohms (Ω)

• Watts (W)

• Coulombs (C)

• Farads (F)

Multiple Choice

How do passive solar heating systems differ from active solar systems?

• Passive systems require more maintenance

• Passive systems use mechanical equipment extensively

• Passive systems use little to no mechanical equipment

• Passive systems are more expensive to install

Multiple Choice

What is the main function of a heat exchanger in a furnace?

• To create combustion

• To transfer heat from burning fuel to circulating air

• To filter out carbon monoxide

• To regulate fuel flow

Multiple Choice

What percentage of heat can modern furnace heat exchangers capture from combustion?

• Up to 75%

• Up to 85%

• Up to 90%

• Up to 97%

Multiple Choice

How does a hydronic heating system distribute heat?

• Through electrical resistance wires

• Through hot water circulating in pipes to convectors

• Through direct combustion

• Through steam pressure only

Multiple Choice

What is the primary difference between a heat pump and a traditional furnace?

• Heat pumps use more electricity

• Heat pumps don't require maintenance

• Heat pumps transfer heat rather than create it

• Heat pumps only work in warm climates

Multiple Choice

At what temperature does the refrigerant typically enter the evaporator in relation to the air temperature?

• 10°F warmer

• 20°F cooler

• Same temperature

• 30°F cooler

Multiple Choice

Why must combustion fumes be kept separate from circulating air in a furnace?

• To maintain proper humidity levels

• To prevent carbon monoxide poisoning

• To improve heating efficiency

• To reduce noise levels

Multiple Choice

What is the function of a regulator in a gas heating system?

• To measure gas usage

• To control gas pressure before building entry

• To filter the gas

• To convert gas to liquid form

Multiple Choice

How do electric heaters generate heat?

• Through chemical reactions

• Through solar absorption

• Through resistance wires

• Through combustion

Multiple Choice

What principle helps distribute heated air throughout a room?

• Osmosis

• Convection

• Radiation

• Conduction

Multiple Choice

What is the primary function of blowers in an HVAC system?

• To heat the air

• To filter contaminants

• To force air through the system

• To regulate temperature

Multiple Choice

Which type of heating system requires a chimney or flue?

• Electric heating

• Solar heating

• Combustion-based heating

• Heat pump systems

Multiple Choice

What makes wood less practical as a primary heating source today?

• It's too expensive

• It's not renewable

• Demand exceeds supply

• It's not efficient enough

Multiple Choice

What is the primary function of an air conditioner in a building?

• To add moisture to the air

• To remove heat and water vapor from the air

• To increase air pressure

• To generate heat inside the structure

Multiple Choice

What is the approximate temperature of the gas refrigerant when it exits the compressor?

• 100°F

• 150°F

• 200°F

• 250°F

Multiple Choice

How many basic components does an air conditioning system have?

• Five

• Six

• Seven

• Eight

Multiple Choice

How does a heat pump work in temperatures below freezing?

• It doesn't work below freezing

• It creates its own heat

• It can still extract heat from very cold air

• It switches to electrical heating

Multiple Choice

What is the main purpose of the refrigerant control valve?

• To increase refrigerant pressure

• To heat the refrigerant

• To meter liquid refrigerant entering the evaporator

• To cool the refrigerant

Multiple Choice

What happens to water vapor in an air conditioning system?

• It is released back into the room

• It is converted to steam

• It is converted to liquid and drained

• It is recycled within the system

Multiple Choice

What is the latent heat of typical refrigerants per pound?

• 970.4 Btu

• 212 Btu

• 68 Btu

• 100 Btu

Multiple Choice

How do heat pumps operate differently from standard air conditioners?

• They only work in winter

• They use different refrigerants

• They have a reversing valve to switch functions

• They cannot remove humidity

Multiple Choice

Which of these materials would be best for insulating a wire?

• Aluminum

• Iron

• Plastic

• Graphite

Multiple Choice

Which of the following devices converts mechanical energy into electrical energy?

• Battery

• Generator

• Diode

• Resistor

Multiple Choice

Which of the following will result in the greatest total resistance in a series circuit?

• 2Ω + 2Ω + 2Ω

• 100Ω + 10Ω

• 47Ω + 47Ω + 47Ω

• 200Ω + 200Ω

Multiple Choice

What is the advantage of geothermal systems over air-based heat pumps?

• They're less expensive to install

• They maintain stable temperatures year-round

• They require less maintenance

• They use less electricity

Multiple Choice

What is the total resistance when two 6Ω resistors are connected in parallel?

• 12Ω

• 3Ω

• 0.33Ω

• 6Ω

Multiple Choice

In what climate are evaporative coolers most effective?

• Hot and humid

• Cold and dry

• Hot and dry

• Cold and humid

Multiple Choice

What are the two main duct systems in a forced-air heating and cooling system?

• Primary and secondary

• Supply and return air

• Intake and output

• Main and auxiliary

Multiple Choice

What is a plenum in an HVAC system?

• A type of refrigerant

• A box-like chamber connecting furnace to extended plenum

• A cooling component

• A type of insulation

Multiple Choice

Where are return air registers typically placed?

• On exterior walls

• On the roof

• On interior walls

• On the floor only

Multiple Choice

What creates the partial vacuum in the system?

• The evaporator

• The condenser

• The compressor

• The control valve

Multiple Choice

What is the purpose of duct insulation?

• To prevent water damage

• To increase air flow

• To maintain temperature and reduce noise

• To prevent rust formation

Multiple Choice

What happens when refrigerant condenses?

• It absorbs heat

• It releases heat

• It maintains constant temperature

• It increases pressure only

Multiple Choice

What does a diode do in a circuit?

• Stores energy

• Regulates voltage

• Reduces resistance

• Allows current in only one direction

Multiple Choice

How does a programmable thermostat help conserve energy?

• It only works during daytime hours

• It automatically turns off at night

• It adjusts temperatures based on time of day and occupancy

• It maintains a constant temperature throughout the day

Multiple Choice

Refer to the voltage vs. current graph. What is the resistance of the component being tested?

• 1.5Ω

• 2Ω

• 3Ω

• 6Ω

Multiple Choice

What is the comfortable range of relative humidity for most people?

• 10-20 percent

• 30-50 percent

• 60-80 percent

• 90-100 percent

Multiple Choice

[ + ] ——— [Switch] ——— [100Ω Resistor] ——— [LED] ——— [ - ]

The LED is not lighting up. What is the most likely explanation?

• The resistor value is too low

• The switch is open

• The battery has too much voltage

• The LED is bypassing the resistor

Multiple Choice

How do electronic air cleaners remove pollutants from the air?

• Through chemical filtration

• Using UV radiation

• Through electrical charges and collection plates

• By heating the air to extreme temperatures

Multiple Choice

A robot is powered by a 12V battery and has a motor rated for 6V. What simple solution could protect the motor from damage?

• Use a larger or longer wire

• Add a voltage divider circuit

• Replace the motor with a speaker

• Use a capacitor instead of a resistor

Multiple Choice

What voltage is typically required for a heat pump compressor in residential installations?

• 12 volts

• 120 volts

• 24 volts

• 240 volts

Multiple Choice

What does the pictured symbol represent in a circuit diagram?

• Battery

• Diode

• Capacitor

• Resistor

Multiple Choice

Which component is commonly used to step voltage up or down in an AC circuit?

• Capacitor

• Diode

• Transformer

• Inductor