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Chapter 3.5 - Fans and Blowers

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Question bank for Energy Managers & Energy Auditors Chapter 3.5: Fans and Blowers Part I: Objective type questions and answers 1. The parameter used by ASME to define fans, blowers and compressors is____ a) Fan ration 2. b) Tube axial c) Vane axial d) Radial b) Radial c) Airfoil, backward Suitable for a) Backward curved i) High pressure, medium flow b) Forward curved ii) Medium pressure, high flow c) Radial iii) High pressure, high flow (a)-iii); (b)-ii); 2 b) Static Pressure c) Both a & b d) neither (a) nor (b) b) Lower c) Same d) None Name the fan which is more suitable for high pressure application? a) Propeller type fans b) Tube-axial fans c) Backward curved centrifugal fan 9. d) None of the above Axial fans are best suitable for____ application. a) Large flow, low head b) Low flow, high head c) High head, large flow 10. d) None The efficiency of backward curved fans compared to forward curved fans is__ a) Higher 8. 3 Q1 N1 c) = Q2 N 2 3 Q1 N1 b) = Q2 N 2 2 The choice of fan type for a given application depends on _______ a) Flow 7. (c)-i) For fans, the relation between discharge and speed is indicated by____ Q1 N1 = a) Q2 N 2 6. d) Forward curved Match the following for centrifugal fan types. Type 5. d) Twist factor Which of the following is not a centrifugal fan type? a) Vane axial 4. c) Blade ratio Which of the following axial fan types is most efficient? a) Propeller 3. b) Specific ratio d) Low flow, low head The efficiency of forward curved fans compared to backward curved fans is ____ 3.5 Fans & blowers - revised (table format) 33

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