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15th National Certification Exam Energy Managers & Auditors AUGUST 2014 Paper 4

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Paper 4 SET A 15th NATIONAL CERTIFICATION EXAMINATION FOR ENERGY AUDITORS August, 2014 PAPER 4: Energy Performance Assessment for Equipment and Utility Systems Date: 24.8.2013 Timings: 14:00-16:00 Hrs Section - I: BRIEF QUESTIONS Duration: 2 Hrs Max. Marks: 100 Marks: 10 x 1 = 10 (i) Answer all Ten questions (ii) Each question carries One mark S-1 Which loss is not considered while evaluating boiler efficiency by Indirect Method ? Ans Blow down loss S-2 What will be the synchronous speed of a VFD driven 4-pole induction motor operating at 40 Hz ? Ans S-3 Ns = 120 x f/P = 120 x 40/4= 1200 RPM What is the refrigerant used in a vapour absorption system with lithium bromide as an absorbent? Ans Water S-4 Other than rated kW of motor and the actual power drawn, what other parameter is required to determine the percentage loading of the motor ? Ans Motor Efficiency or rated motor efficiency S-5 Ans S-6 Ans S-7 Ans S-8 Inclined tube manometer is used for measuring gas flow in a duct when the air velocity is very high: True or False? False. A pump will cavitate if the NPSHrequired is _________ than the NPSHavailable. More To determine the effectiveness of the cooling tower, it is required to measure cooling water inlet, outlet and _____temperatures. Ambient Wet bulb The ratio of actual heat transfer to the heat that could be transferred by heat exchanger of infinite size is termed as 1 _______________________ Bureau of Energy Efficiency

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