Compressors: Objective 5

What are the two main types of compressors?

• centrifugal compressors and axial compressors

• vane compressors and scroll compressors

• dynamic compressors and positive displacement compressors

• rotary compressors and reciprocating compressors

How is the compression ratio calculated in compressors?

• Compression ratio = Absolute Discharge Pressure / Absolute Suction Pressure

• Compression ratio = Absolute Discharge Pressure * Absolute Suction Pressure

• Compression ratio = Absolute Discharge Pressure - Absolute Suction Pressure

• Compression ratio = Absolute Discharge Pressure + Absolute Suction Pressure

Explain the working principle of a compressor.

• A compressor operates by reducing the volume of a gas to increase its pressure.

• A compressor works by heating the gas to increase its pressure.

• A compressor operates by expanding the volume of a gas to decrease its pressure.

• A compressor functions by converting gas into a liquid form.

Provide examples of applications where compressors are commonly used.

• Washing machines, dishwashers, vacuum cleaners

• Toasters, coffee makers, microwave ovens

• Refrigeration systems, air conditioners, gas turbines, pneumatic tools

• Lawnmowers, leaf blowers, snow blowers

How is the efficiency of a compressor measured?

• Isentropic efficiency

• Adiabatic efficiency

• Volumetric efficiency

• Thermal efficiency

What are some key maintenance practices for compressors?

• Painting the compressor red for better performance

• Using the compressor continuously without breaks

• Ignoring any strange noises coming from the compressor

• Regular inspection of belts, filters, and oil levels, ensuring proper ventilation, checking for leaks, and following manufacturer's guidelines.

Which type of compressor is more suitable for high-pressure applications?

• Centrifugal compressors

• Diaphragm compressors

• Reciprocating compressors

• Screw compressors

What is the ideal compression ratio for an efficient compressor operation?

• 20:1 to 25:1

• 12:1 to 15:1

• 3:1 to 5:1

• 7:1 to 10:1

Describe the process of air compression in a reciprocating compressor.

• The compressor draws air out of the system

• The compressed air is released into the atmosphere without any further use

• The process of air compression in a reciprocating compressor involves drawing air into the cylinder, compressing it by reducing the volume, and then discharging the compressed air into the system.

• The process involves heating the air before compression

What factors can affect the efficiency of a compressor?

• Number of clouds, favorite food, shoe brand

• Color of the sky, day of the week, shoe size

• Type of compressor, operating temperature, pressure ratio, suction temperature, discharge temperature, clearance volume, maintenance practices

• Distance to the moon, favorite movie, hair color