# Improving Compressed Air System Performance

## Quiz Questions

 1. What is the use of compressor? To increase the pressure of the gas. To decrease the pressure of the gas. To maintain the pressure of the gas. None of these 2. The inherent characteristic of centrifugal air compressor is that as system pressure decreases the compressor‘s flow capacity decrease. True False 3. What is the oldest method of driving compressors? Steam Engine Turbine Both a & b None of these 4. Dense-phase transport is used to transport solids in a(n) ——————————format. individual batch Both a & b None of these 5. The term vacuum generation describes applications where compressed air is used in conjunction with a venture, educator or ejector to generate a negative- pressure mass flow. True False 6. Total leakage (percentage) can be calculated as follows: where: T = on-load time (minutes)t = off-load time (minutes) Leakage (%)= [(T x 100)/(T*t)] Leakage (%) = [(T x 100)/(T+t)] Leakage (%) = [(T x 100)/(T-t)] None of these 7. While cooling the temperature of the lubricant injected into the compression chamber is generally controlled directly to a minimum of 1600 Fahrenheit. 1500 Fahrenheit. 1400 Fahrenheit. 1300 Fahrenheit. 8. Rotary screw compressors may be air or water cooled. True False 9. Depending on air system demand the control range can be anywhere from 1 to 20 psi. 2 to 20 psi. 1 to 30 psi. 2 to 30 psi. 10. What is critical temperature? The highest temperature at which well-defined liquid and vapour states exist. Sometimes it is defined as the highest temperature at which it is possible to liquefy or gas by pressure alone. Both a & b None of the above 11. Excessive pressure drop will result in poor system performance and excessive energy consumption. efficient system performance and less energy consumption. poor system performance and less energy consumption. efficient system performance and excessive energy consumption. 12. Centrifugal air compressors are high speed rotating machines. low speed rotating machines. medium speed rotating machines. None of the above 13. Aerating, agitating, oxygenating or percolating liquid with compressed air is defined as open blowing. sparging. aspirating. atomizing. 14. The typical applications of cabinet cooling are programmable controllers, line control cabinets, motor control cabinets and relay pads. True False 15. Leaks occur most often at ___________. joints and connections. only joints. only connections. None of these 16. Which compressor is usually limited to higher volume industrial applications? Centrifugal compressor Simple and double acting compressor Rotary compressor None of the above 17. Valves are used to_______________. direct the flow prevent flow Both a & b None of the above 18. Seals in compressors are used as________________. maximize leakage minimise leakage increase the flow of the fluid None of the above 19. Which element is measured in order to estimate the annual electricity consumption of a compressed air system? Pressure Power Temperature Baseline 20. ___________ detection and repair is an important part of any maintenance program. Compressor Leak Both a & b None of these