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19th National Certification Exam Energy Managers & Auditors SEPTEMBER 2018 Paper 3

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Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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Paper 3 Set A 19th NATIONAL CERTIFICATION EXAMINATION FOR ENERGY MANAGERS & ENERGY AUDITORS SEPTEMBER, 2018 PAPER 3 : ENERGY EFFICIENCY IN ELECTRICAL UTILITIES Section I: OBJECTIVE TYPE Marks: 50 x 1 = 50 (i) Answer all 50 questions (ii) Each question carries One mark (iii) Please hatch the appropriate oval in the OMR answer sheet with HB pencil only, as per instructions 1. 2. 3. Which of the following incandescent bulbs will have the least resistance ? a) 220 V, 60 W b) 220 V, 100 W c) 115 V, 60 W d) 115 V, 100 W In a rolling mill, the loading on the transformer was 1200 kVA with the power factor of 0.86. The plant improved the power factor to 0.98 by adding capacitors. What is the reduction in kVA ? a) 144 b) 147 c) 171 d) 163.3 A 22 kW, 415 V, 45 A, 0.8 pf, 1475 rpm, 4 pole 3 phase induction motor operating at 420 V, 40 A and 0.8 pf. What will be the motor efficiency? a) 85.0 % b) 94.5 % c) 89.9 % 4. The purpose of inter-cooling in a multistage compressor is to a) Increase the pressure of air b) Reduce the work of compression c) Separate moisture and oil vapour 5. d) Less than double Which of the following is not a part of vapour compression refrigeration cycle ? a) Compressor b) Evaporator c) Condenser 8. d) 860 kCal/hr If two identical pumps operate in series, their shut-off head is a) Not affected b) More than double c) Doubled 7. d) None of the above One ton of refrigeration is not equal to__________. a) 3024 kCal/hr b) 3.51 kW c) 12000 Btu/hr 6. d) None of the above d) Generator If the power consumed by an air conditioner compressor is 1.7 kW per ton of refrigeration, then its energy efficiency ratio (Watt/Watt) is _____ a) 1.7 b) 2.1 c) 0.59 d) None of the above

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