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18th National Certification Exam Energy Managers & Auditors SEPTEMBER 2017 Paper 4

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Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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Paper 4 Set A 19th NATIONAL CERTIFICATION EXAMINATION FOR ENERGY MANAGERS & ENERGY AUDITORS - September, 2018 PAPER 4: ENERGY PERFORMANCE ASSESSMENT FOR EQUIPMENT AND UTILITY SYSTEMS Section - I: BRIEF QUESTIONS S-1 (i) Section I contains Ten questions (ii) Each question carries One mark Marks: 10 x 1 = 10 The capacity of a screw compressor cannot be controlled by discharge throttling. True or False Ans True S-2 A package air conditioner of 5 TR capacity delivers a cooling effect of 4 TR. If Energy Efficiency Ratio (W/W) is 2.90, the power in kW drawn by compressor would be ___________ Ans =(4*3024)/860 = 14.065/2.90 = 4.85 S-3 If the steam generation in a boiler is reduced to 45%, the radiation loss from the surface of the boiler will reduce by the same ratio. True or False Ans False S-4 If the coal Gross Calorific Value is 4200 kcal/kg and specific coal consumption is 0.6 kg/kWh, what is the power station gross efficiency ? Ans (860 /(4200 x 0.6)) x100 = 34.12% S-5 If the measured input power of a 90 kW motor is 45 kW, then the calculated loading of the motor is 50 %. True or False Ans False S-6 The speed of an energy efficient motor will be more than the standard motor of same capacity because ________________ decreases. Ans Slip S-7 O2 % in flue gas is required in the direct method efficiency evaluation of a boiler. True or False Ans False S-8 To minimize scale losses in a reheating furnace, the furnace should be operated at a negative pressure. True or False Ans False

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