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Chapter 4.8 - Compressors

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Selected questions Chapter 4.8: Compressors Short type questions 1. Define compression ratio for a compressor Ans 2. Compression ratio = Absolute discharge pressureof last stage Absoluteintake pressure What are the different components of a compressed air system network? Ans The different components that are available in a compressed air network are Intake air filters Inter-stage coolers After coolers Air dryers Moisture drain traps Receivers 3. List at least three different flow control methods adopted in a compressed air system? Ans Various flow control methods are Automatic On/Off control Load and Unload Multi-step control Throttling control 4. Define volumetric efficiency of a compressor? Ans 5. Volumetric efficiency = Free air delivery , m / min compressor displaceme nt What are the various instruments required for performance evaluation of compressed air systems by nozzle method? Ans Various instruments required are Thermometers or Thermocouple Pressure gauges or Manometers Differential pressure gauges or manometers Standard nozzle Psycho meter Tachometer/Stroboscope Electrical demand analyser 6. Define specific power requirement? Ans 7. The ratio of power consumption in kW to the volume delivered at ambient conditions. During the a leakage assessment test, compressor was loaded for 7 minutes and unloaded for 20 minutes. If the actual free air delivered is 200 CFM then evaluate quantity of leakage. 4.8 - Compressors (table format) 46

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