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Questions and Answers
What is the pressure exerted when a force of 500 N is applied over an area of 0.05 m²?
An air compressor increases air pressure by increasing the volume of air.
False
Name one benefit of using an air compressor in various applications.
Flexibility or convenience.
An air compressor can be classified as single stage or _____ stage.
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Match the following types of air compressors with their respective characteristics:
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Which of the following is NOT a cause of air compressor failure?
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Changing the oil filter is an essential part of air compressor maintenance.
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What should be checked to prevent overheating in an air compressor?
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To ensure proper operation, it is important to check the ___ of the drive belt.
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Match the air compressor maintenance technique to its purpose:
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What is a primary component of the FRL (Filter, Regulator, Lubricator) system?
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Variable flow air compressors are designed to maintain a constant flow of compressed air.
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Name one best practice for maintaining an air distribution system.
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What will be the final volume of a gas occupying 80 cm³ at 700°C if the temperature is doubled at constant pressure?
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Boyle's Law states that at constant temperature, the volume of a gas is directly proportional to its pressure.
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What is the minimum pressure required to compress 500 dm³ of air at 1 bar to 200 dm³?
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According to Gay-Lussac's Law, the pressure of a gas varies directly with its absolute ______.
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Match the following laws with their descriptions:
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Which statement best defines Boyle's Law?
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Gay-Lussac's Law can be simplified to P1/T1 = P2/T2.
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What happens to the volume of a gas when its temperature is increased while keeping the pressure constant?
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Study Notes
Reciprocating Air Compressor Parts
- Intake Valve: Allows air to enter the cylinder during the intake stroke.
- Connecting Rod: Connects the piston to the crankshaft.
- Cylinder: The chamber where air is compressed.
- Crankshaft: Converts the linear motion of the piston to rotational motion.
- Crankcase: Houses the crankshaft and connecting rod.
- Discharge Valve: Allows compressed air to exit the cylinder during the discharge stroke.
- Piston: A movable component that compresses air within the cylinder.
- Piston Rings: Seals the space between the piston and cylinder wall, minimizing air leakage.
- Flywheel: Stores energy from the crankshaft, providing momentum for smooth operation.
Air Compressor Parts
- Function of Air Compressor Parts: The specific components work together to draw air from a source, compress its volume, and then release it at a higher pressure.
- Why pneumatics system generally limited to work at 12 to 14 bar pressure: Due to the limitations of pneumatic system components, such as actuators, valves, and pipes, the pressure is typically kept within this range for optimal performance and safety.
Air Characteristics
- Boyle's Law: States that the product of absolute pressure and volume of a given mass of gas remains constant if the temperature of the gas remains constant. Formula: P1 x V1 = P2 x V2 = constant.
- Charles Law (Law of Volume): States that for a given mass of gas at constant pressure, the volume is proportional to the absolute temperature. Formula: V1/T1 = V2/T2 = constant.
- Gay-Lussac's Law: States that the pressure exerted by gas of a given mass and kept at a constant volume varies directly with the absolute temperature of the gas. Formula: P ∝ T ; P/T = k or P1/T1=P2/T2.
Air Compressor
- Definition: An air compressor is a mechanical device that increases the pressure of air by reducing volume.
- Function: An air compressor converts electrical energy into kinetic energy in the form of air, storing it in a tank for various uses.
- Applications: Clean under pressure, generating torque and developing force using actuators.
- Advantages: Free of cost, safe, flexible, and convenient.
- Maintenance: Low due to its simple design.
Classification of Air Compressors
- According to the number of stages: Single-stage, double-stage, three-stage, or multiple-stage.
- According to action: Single-acting or double-acting.
- According to the position of the cylinder w.r.t. crankshaft: Cylinders in-line, vertical, radial position, V-type cylinder arrangement.
- According to prime mover: Electric motor drive, IC engine drive, or Gas turbine drives.
- According to cooling medium: Air cooled, water cooled.
- As per mounting: Portable or stationary.
### Classification – Construction & Working Principle
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Positive displacement: Reciprocating, Rotary.
- Reciprocating: Piston, Labyrinth, Diaphragm.
- Rotary: Lobe, Liquid (water ring), Sliding vane, Mono screw, Twin screw.
- Dynamic air compressor: Centrifugal, Axial flow, Ejector.
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Description
This quiz covers the essential components of reciprocating air compressors, including the intake valve, piston, and crankshaft. Understand how each part functions in the process of compressing air. Test your knowledge on their roles and relationships in an air compressor system.
