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7th National Certification Exam Energy Managers & Auditors NOVEMBER 2008 Paper 4

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Paper 4 Set A, Energy Auditor Key Regn No: _________________ Name: ___________________ (To be written by the candidates) 7th NATIONAL CERTIFICATION EXAMINATION FOR ENERGY AUDITORS Nov., 2008 PAPER 4: Energy Performance Assessment for Equipment and Utility Systems Date: 23.11.2008 Timings: 1400-1600 HRS Duration: 2 HRS Section - I: SHORT DESCRIPTIVE QUESTIONS Max. Marks: 100 Marks: 10 x 1 = 10 (i) Answer all Ten questions (ii) Each question carries One mark (iii) Answer should not exceed 50 words S-1 What will be the synchronous speed of a VFD driven 4-pole induction motor operating at 38 Hz ? Ans. Ns = 120 x f/P = 120 x 38/4 = 1140 RPM S-2 If the power consumed by a refrigeration compressor is 2 kW per ton of refrigeration, what is the energy efficiency ratio? Ans. EER = 12000 Btu 2000 W = 6 S-3 Explain why heat rate of back pressure turbine is greater than that of a condensing turbine. Ans. As it does not take into account of the heat content of the exhaust steam used in the process. S-4 Why line current method used for estimating loading of a motor is not applicable for motor loading less than 75%. Ans. At lower loadings, power factor of a motor degrades significantly and ampere-load curve becomes nonlinear S-5 Explain why actual air delivered is always converted to (FAD) while measuring delivered air volume flow rates in an air compressor. Ans. As air is compressible, its volume flow rate will vary with pressure on delivery side and hence for comparison purposes the volume flow rates are always converted to their value at standard atmospheric pressure. _________________________ Bureau of Energy Efficiency 1

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