Questions and Answers
Propane and Butane are _______ than air.
heavier
What will be the resistance in the circuit if the supply voltage is 30V and current flowing through the circuit is 5A?
6 ohms
What is the temperature at which oil starts to produce a waxy substance that may interfere with the refrigeration system?
floc point
What manifold gauge set is used to charge, evacuate, add oil, and recover refrigerant from a refrigeration and air conditioning system?
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Where is the oil separator located?
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Higher the ambient temperatures, ____ will be the evacuation time of the refrigerants from the system.
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1 Watt is equal to how many Btu's?
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What is the heat that is absorbed or extracted when a substance changes its state?
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Where is the sight glass present in the refrigeration cycle?
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Which shall not be used near flammable materials?
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Current in a closed circuit is limited by?
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When there is an increase in the heat load on the evaporator, the refrigerant will tend to evaporate at a _____ rate.
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At what voltage does the gas valve operate?
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Furnaces are placed into categories based upon?
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What type of compressor uses two special helical rotors that introduce suction vapors then compress them?
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1 kWh of electric power is equivalent to how many Btu per hour?
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A high pressure steam boiler operates at a pressure greater than?
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Study Notes
Propane and Butane
- Propane and Butane are heavier than air, affecting their behavior in ventilation.
Electrical Resistance
- If a supply voltage is 30V and the current is 5A, the resulting resistance in the circuit is 6 ohms.
Refrigeration System
- The term "floc point" refers to the temperature at which oil starts producing a waxy substance, potentially interfering with refrigeration systems.
Manifold Gauge Set
- The yellow hose in a manifold gauge set is utilized for charging, evacuating, adding oil, and recovering refrigerant in HVAC systems.
Oil Separator Location
- The oil separator is situated in the discharge line of the refrigeration cycle.
Evacuation Time
- Higher ambient temperatures lead to lesser evacuation time for refrigerants from the HVAC system.
Power Conversion
- 1 Watt is equivalent to 3.41 Btu's, a crucial conversion for heating calculations.
Latent Heat
- Latent heat is the amount of heat absorbed or extracted when a substance changes its state, playing a significant role in refrigeration.
Sight Glass
- The sight glass is located in the liquid line of the refrigeration cycle, allowing technicians to observe the system's refrigerant level.
Halide Leak Detector
- Halide leak detectors should not be used near flammable materials due to safety risks.
Circuit Current
- In a closed circuit, the current is limited by the resistance present in the circuit components.
Refrigerant Evaporation
- An increase in heat load on the evaporator results in the refrigerant evaporating at a faster rate, affecting system performance.
Gas Valve Voltage
- Gas valves typically operate at a voltage of 24V, a standard in HVAC systems.
Furnace Categories
- Furnaces are categorized based on their venting characteristics, influencing installation and safety practices.
Screw Compressors
- Screw compressors use two specialized helical rotors that introduce suction vapors and compress them, providing efficient refrigerant handling.
Electric Power Conversion
- 1 kWh of electric power is equivalent to 3412 Btu per hour, relevant for energy consumption calculations.
High Pressure Steam Boiler
- A high-pressure steam boiler operates at pressures greater than 15 psig, indicating its operational capacity and design parameters.
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Description
Test your knowledge on HVAC fundamentals including refrigeration systems, electrical resistance, and the properties of propane and butane. This quiz covers essential concepts critical for understanding heating and cooling systems. Perfect for students and professionals looking to reinforce their HVAC expertise.
