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Chapter 3.3 - Compressed Air System

9 pages, 45 questions, 1 questions with responses, 1 total responses,

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Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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Question bank for Energy Managers & Energy Auditors Chapter 3.3: Compressed Air System Part I: Objective type questions and answers 1. Which of the following type does Screw compressor belongs to? a) Positive displacement compressor c) Both a & b 2. b) Dynamic compressors d) None of the above The compressor capacity of a reciprocating compressor is directly proportional to __ a) Speed 3. b) Pressure b) Same c) Higher d) None b) Same c) Higher d) None b) Higher c) moderate d) None The volumetric efficiency of the compressor ______ with the increase in altitude of place a) increases 8. d) 10 50 cfm The compression ratios for axial flow compressors are ____. a) Lesser 7. c) Above 10ooo cfm The discharge temperature of two stage compressor compared to single stage one is ____ a) Lesser 6. b) 200 500 cfm The specific power consumption of non lubricated compressor compared to lubricated type is ____ a) Lesser 5. d) All Vertical type reciprocating compressors are used in the capacity range of _____ a) 50 150 cfm 4. c) Volume b) decreases c) does not change d) None The ratio of isothermal power to actual measured input power of a compressor is known as: a) Isothermal efficiency b) Volumetric Efficiency c) Barometric efficiency d) None 9. The basic function of air dryer in a compressor is: a. prevent dust from entering compressor b. storage and smoothening pulsating air output c. reduce the temperature of the air before it enters the next state to increase efficiency d. to remove remaining traces of moisture after after-cooler 10. For every 4 C raise in air inlet temperature of an air compressor, the power consumption will increases by_____ a) 2% 11. c) 3% d) 4% The percentage increase in power consumption of a compressor with suction side air filter and with the pressure drop across the filter of 200 mmWc is ____ a) 1.0% 12. b) 1% b) 3% c) 2.4% d) 1.6% Which of the statement is True for centrifugal compressors? a) The compressor should not be operated at full load b) The compressor should be operated at shut off pressure c) The compressor should not be operated with inlet-guide vane control 3.3 Compressed air system - revised (table format) 17

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