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19th National Certification Exam Energy Managers & Auditors SEPTEMBER 2018 Paper 1

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Paper 1 SET A 19th NATIONAL CERTIFICATION EXAMINATION FOR ENERGY MANAGERS & ENERGY AUDITORS SEPTEMBER, 2018 PAPER 1: GENERAL ASPECTS OF ENERGY MANAGEMENT & ENERGY AUDIT 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 HB pencil only, as per instructions 1. Which among the following is not a renewable source of energy? a) Bagasse b) Rice husk c) Nuclear d) Wind 2. What is a) b) c) d) 3. Which of the following has the lowest energy content in terms of MJ/kg a) LPG b) Diesel c) Bagasse d) Furnace oil 4. _________ and _______ consume major share of Natural Gas consumption in India. a) Domestic sector and Transport sector b) Transport sector and Fertilizer Industry c) Power Generation and Fertilizer Industries d) Domestic Sector and Fertilizer Industries 5. The sector consuming major share of energy in India a) Agriculture Sector b) c) Industrial Sector d) 6. Which of the following designated consumer has the lowest energy intensity? a) Aluminium b) Iron and Steel c) Cement d) Chlor alkali 7. Which of the following is not a Demand Side Management measure? a) Implementing Time of the Day (ToD) Electricity Tariff b) Maximizing fossil fuel based energy utilization c) Replacement of inefficient electrical appliances d) Use of ice bank system 8. shale Oil? Sedimentary rock containing solid bituminous materials Heavy black viscous oil combination of clay, sand, water and bitumen A form of naturally compressed peat combustible brownish-black sedimentary rock Transport Sector Domestic Sector Which of the following does not meet the Designated Consumer criteria? a) Pulp and Paper Industries with minimum annual energy consumption of 30,000 TOE. b) Cement Industries with minimum annual energy consumption of 30,000 TOE. c) Chlor- Alkali Industries with minimum annual energy consumption of 7500 TOE. _______________________ Bureau of Energy Efficiency 1 Paper 1 SET A d) Textile Industries with minimum annual energy consumption of 3000 TOE. 9. The kW a) b) c) d) or HP of a motor given on the name plate indicates The shaft output of the motor at part load The shaft output of the motor at full load The input power to the motor at the best efficiency point The input power to the motor at any load 10. Which of the following has the highest Specific Heat? a) Steel c) Copper b) d) Aluminium Water 11. Heat transfer in an air cooled condenser occurs predominantly by a) conduction c) radiation b) convection d) none of the above 12. Definition of Energy Audit as per EC Act does not include: a) b) c) d) Creation of an Energy Management System (EnMS) evaluation of Techno-economics Verification, monitoring and analysis of energy use Action plan required for energy saving 13. The ISO standard for Energy Management System is a) b) c) d) ISO 14001 ISO 50001 ISO 9001 ISO 18001 14. To arrive at the relative humidity at a point we need to know___________of air a) dry bulb temperature c) enthalpy b) d) wet bulb temperature both a & b 15. As per Energy Conservation Act, 2001 appointment of BEE Certified Energy Manger is mandatory for a) all State designated agencies c) all designated consumers b) all large Industrial consumers d) all commercial buildings 16. A waste heat recovery system requires Rs. 50 lakhs investment and Rs. 2 lakhs per year to operate and maintain. If the annual savings is Rs. 22 lakhs, the payback period will be a) 2.28 years b) 2.5 years c) 3 years d) 10 years 17. What is the heat content of the 200 liters of water at 5000C in terms of the basic unit of energy in Kilo Joules a) 30000 c) 10000 b) 23880 d) 41870 Note: 1 Mark is awarded to all candidate who have attempted this question. 18. Which of the following GHGs has the longest atmospheric life time a) CH4 c) CFC b) SF6 d) PFC 19. Which of the following is used for non-contact measurement of temperature a) c) Thermocouples Leaf type contact probe b) Infrared Thermometer d) All of the above 20. The force field analysis in energy action planning considers a) Positive forces only c) Both negative and positive forces _______________________ Bureau of Energy Efficiency b) negative forces only d) no forces 2 Paper 1 SET A 21. Which of the following equation is used to calculate the future value of the cash flow? a) NPV (1 i)n b) NPV / (1 i)n c) NPV (1 + i) n d) NPV/ (1 + i)n 22. For investment decision, ROI must always be _____ prevailing interest rate. a) Lower than c) Equal to b) Higher than d) No relation 23. Large scattering on production versus energy consumption trend line indicates a) c) Poor process control Inefficient process b) Inefficient equipment d) None of the above 24. Frequency of energy audit for designated consumers is______ a) once in a year c) once in three years b) once in two years d) Once in five years 25. The rotor axis is aligned with the wind direction in a wind mill by ________ control a) yaw c) disc break 26. Producer gas basically comprises of a) CO, H2 and CH4 c) CO and CH4 b) pitch d) all of the above b) Only CH4 d) Only CO and H2 27. The lowest theoretical temperature to which water can be cooled in a cooling tower is a) b) c) d) Difference between DBT and WBT of the atmospheric air Average DBT and WBT of the atmospheric air DBT of the atmospheric air WBT of the atmospheric air 28. In a solar thermal power station Molten salt is preferred as it provides an efficient low cost medium to store ______ energy a) Electrical c) Kinetic b) Thermal d) Potential 29. From Voltage, Amps and Power factor given in the name plate of a motor, one can calculate ________. a) Rated output power c) Rated input power 30. RPM of an electric motor is measured using ___. a) Ultrasonic meter c) Lux meter b) Shaft power d) Both (b) & (c) b) Stroboscope d) Rotameter 31. If asset depreciation is considered, then net operating cash inflow would be a) lower c) no effect b) higher d) none of the above 32. Which of the following comes under Capital cost in a project? a) Design cost c) Commissioning cost 33. Energy consumption per GDP is termed as ___. a) Energy factor c) Energy Efficiency index b) Installation cost d) All of the above b) Energy intensity d) All of the above 34. A three phase induction motor is drawing 10 Ampere at 440 Volts. If the operating _______________________ Bureau of Energy Efficiency 3 Paper 1 SET A power factor of the motor is 0.9 and the efficiency of the motor is 95%, then the mechanical shaft power of the motor is a) 3.76 KW b) 4.18 KW c) 6.51 KW d) 7.21 KW 35. For an activity in a project, Latest start time is 8 weeks and Latest finish time is 12 weeks. If the earliest finish time is 9 weeks, Slack time for the activity is ____. a) 3 weeks b) 4 weeks c) 1 week d) none of the above 36. The amount of CO2 produced in complete combustion of 18 Kg of Carbon is ______. a) 50 c) 66 b) 44 d) 792 37. Which mode of heat transfer does not require medium? a) Natural convection c) Radiation b) Forced convection d) Conduction 38. If the fixed energy consumption of a company is 2000 kWh per month and the line slope of the energy (y) versus production (x) chart is 0.3, then the energy consumed in kWh per month for a production level of 60,000 tons/month is _______. a) 16,000 KWh b) 18,000 KWh c) 22,000 KWh d) none of the above 39. Which technique takes care of time value of money in evaluation? a) payback period c) NPV b) IRR d) Both (b) & (c) 40. The heat rate of a power plant is expressed as a) kWh/kg of steam c) kg of steam / kg of fuel b) kCal/kWh d) kWh / kVA 41. Which equipment does not come under mandatory labelling program? a) c) Room Air conditioners Induction motors b) Frost free refrigerator d) Distribution transformer 42. Furling speed of wind turbine indicates ____ a) Cut out speed c) Rated speed b) Cut in speed d) None of the above 43. One Silicon cell in a PV module typically produces a) 0.5 V c) 2 V 44. The input to a fuel cell is. a) Electricity c) Oxygen b) 1 V d) 12 V b) Hydrogen d) All of the above 45. The production factor is defined as the ratio of a) b) c) d) current year production to the reference year production current year production to the reference month production reference month production to the current month production reference year production to the current year production 46. To reduce the distribution losses within a plant, the capacitors should be located a) Closest to the load c) In the substation b) d) Farthest from the load Before the billing meter 47. Absolute pressure is measured as a) Gauge pressure Atmospheric pressure _______________________ Bureau of Energy Efficiency 4 Paper 1 SET A b) Gauge pressure + Atmospheric pressure c) Gauge pressure / Atmospheric pressure d) none of the above 48. The dryness (x) fraction of superheated steam is taken as a) x= 0 c) x= 0.87 b) x= 0.9 d) x= 1 49. When the evaporation of water from a wet substance is zero, the relative humidity of the air is likely to be a) 0% c) 50% b) d) 100% unpredictable 50. Which of the following type of collector is used for low temperature systems? a) c) Flat plate collector Parabolic trough collector b)Line focusing parabolic collector d) None of the above . . End of Section I .. . Section II: SHORT DESCRIPTIVE QUESTIONS (i) (ii) S-1 Ans S- 2 Marks: 8 x 5 = 40 Answer all Eight questions Each question carries Five marks List five equipment and appliances covered under Standards and Labelling program. Refer BEE Guide Book 1- Page No 37 State true or false (each carries 1 mark) a) When it is raining, there is a substantial difference between the dry and wet bulb temperatures. b) The specific gravity of light diesel oil is given in kg/m3 c) The major constituent of LNG is propane d) Evaporative cooling of space requires use of refrigerant R134a e) HSD needs preheating to increase viscosity Ans a) c) e) False False False b) False d) False S 3 For installing a recuperator in a furnace, the plant has assessed the following time estimates Optimistic Time : Most Likely Time : Pessimistic Time : 2.5 weeks 3 weeks 3.5 weeks Find out the Expected Time , Standard Deviation and Variance to complete the activity (2 +1.5+1.5 Marks) _______________________ Bureau of Energy Efficiency 5 Paper 1 SET A Ans Expected time = (Optimistic Time + 4 X Most Likely Time + Pessimistic Time) / 6 = (2.5 + 4 x 3 + 3.5)/ 6 =3 Standard Deviation = (3.5-2.5)/6 = 1/6 = 0.167 Variance = {(PT-OT/6)} 2 = 1 / 36 = 0.0278 S-4 A thermal power plant uses 0.72 kg of coal to generate one KWh of electricity. If the coal contains 38% carbon by weight, calculate the amount of CO2 emission/KWh under complete combustion. Ans Amount of carbon present in coal = 0.72 * 38/100 = 0.2736 kg As per chemical reaction, C + O2 = CO2 1 kg of carbon generates 44/12 kg of carbon dioxide (CO2) under complete combustion Amount of CO2 generation while generating one KWh of electricity = 0.2736 * 44/12 = 1.0032 Kg/KWh S-5 A solar photovoltaic power plant is installed with 350 Watts panel of size 1.5 m x 1.5 m in roof top area of a building having dimension of 9 m x 10m. If solar insolation is 1,000 W/m2, calculate the panel conversion efficiency? Ans Area of solar cell = 1.5 x 1.5 = 2.25 m2 Efficiency = (350 /(2.25 x 1000)) x 100 = 15.6 % S 6 A paint drier requires 75.4 m3/min of air at 93 C, which is heated in a steam-coil unit. How many kg of steam at 4 bar does this unit require per hour? The density of air is 1.2 kg/m3 and specific heat of air is 0.24 kcal/kg C. The ambient temperature is 32 C. Pressure bar Temperature C 4 Ans 143 Solution: Air flow rate Air flow rate Enthalpy kcal/kg Water Evaporation Steam 143 510 653 = 75.4 m3/min * 60 = 4524 m3/hr = 4524 * 1.2 = 5428.8 kg/hr Sensible heat of air = = = m * Cp * T 5428.8 * 0.24 * (93-32) 79477.6 kcal/hr Latent heat of Steam Steam required Steam required = = = 510 Kcal/kg 79477.6 / 510 156 kg/hr _______________________ Bureau of Energy Efficiency 6 Paper 1 SET A S 7 An ESCO company is required to invest in a waste heat recovery project, which is expected to yield an annual saving of Rs.10,00,000 and the life of the equipment is 7 years. If the ESCO expects 30% IRR on this project, calculate the investment required to be made. Ans The PV of the Annual Savings of Rs.1,000,000 per year: 0= Investment (1+ 0.3)0 + 1000000 (1+ 0.3)1 + 1000000 (1+ 0.3)2 + 1000000 (1+ 0.3)3 + 1000000 (1+ 0.3)4 + 1000000 (1+ 0.3)5 + 1000000 (1+ 0.3)6 + 1000000 (1+ 0.3)7 or Investment = Rs.1,000,000/year (P/AIN Factor) = Rs.1,000,000/year (2.8021) = Rs. 2,802,100 Thus, we can pay Rs.2,802,100 for the Waste Heat Exchanger and still have a positive NPV. S 8 In a textile plant monthly energy consumption is 7,00,000 kWh of electricity , 40 kL of furnace oil ( specific gravity=0.92) for thermic fluid heater, 360 tonne of coal for steam boiler and 10 kL of HSD ( specific gravity= 0.885) for material handling equipment. Compute the energy consumption in terms of Metric Tonne of Oil Equivalent (MTOE) for the plant. Given Data: (1 kWh = 860 kcal, GCV of coal= 3450 kCal/kg, GCV of furnace oil= 10,000 kcal/kg, GCV of HSD= 10,500 kcal/kg, GCV of rice husk= 3100 kcal/kg, 1 kg oil equivalent = 10,000 kcal) Ans Aggregate Energy Use= (40000 x0.92x 10000) + (360000 x 3450) + (7, 00,000 x 860) + (10,000x 0.885 x 10,500). MTOE = (36.8 x 107) + (124.2 x 107) + (60.2 x 107)+ (9.2925 x 107) 107 = 230.5 Metric Tonnes of Oil Equivalent per month Energy consumption of the textile plant = 230.5 x 12 = 2766 MTOE . . End of Section II .. . _______________________ Bureau of Energy Efficiency 7 Paper 1 SET A Section III: LONG DESCRIPTIVE QUESTIONS (i) (ii) L-1 Ans Refer BEE Guide Book 1- Page No 275-276 a. b. Explain briefly three types of Performance Contracting? (6 Marks) What are the drawbacks of ESCO? (4 Marks) Refer BEE Guide Book 1- Page No.178 L - 3 a) b) Ans Answer all Six questions Each question carries Ten marks Describe the stages of Gasification of Biomass process with a pictorial diagram and reaction equations? L 2 Ans Marks: 6 x 10 = 60 Write down the steps for computing energy savings using CUSUM over a period. (4 Marks), Develop a table using a CUSUM technique to calculate energy savings for 8 months period for a production level of 2000 MT per month. Refer to field data given in the table below. (6 marks) Month Actual SEC kWh/MT Predicted SEC kWh/MT May 1225 1250 June 1227 1250 July 1240 1250 Aug 1245 1250 Sep 1238 1250 Oct 1257 1250 Nov 1248 1250 Dec 1264 1250 a) Steps for CUSUM analysis: Refer BEE Guide Book 1 Page No. 229 b) Estimate the savings accumulated from use of the heat recovery system. Month Actual SEC kWh/MT Predicted SEC kWh/MT Difference (Actual SEC Predicted SEC) kWh/MT CUSUM Savings kWh/MT May 1225 1250 -25 -25 June 1227 1250 -23 -48 _______________________ Bureau of Energy Efficiency 8 Paper 1 SET A July 1240 1250 -10 -58 Aug 1245 1250 -5 -63 Sep 1238 1250 -12 -75 Oct 1257 1250 +7 -68 Nov 1248 1250 -2 -70 Dec 1264 1250 +14 -56 Positive savings i.e. savings in energy consumption over a period of eight months are 56 x 2000 = 112,000 kWh L 4 Ans In a Chlor-Alkali plant, an evaporator was designed to concentrate 500 kg of liquor containing solids of 7% w/w (weight by weight) to 45% solids w/w in the output. Presently the output from evaporator has 30% solids w/w. The energy manager suggested overhauling the evaporator to achieve the design rate of solids w/w in the output. Calculate the percentage improvement in water removal in the evaporator after overhauling of the evaporator. Amount of feed (input) to the evaporator Concentration of solids in feed Amount of solids in feed (input) = = = = 500 Kg 7 wt% 500 * 7 /100 35 Kg = 30 wt% = 0.3 = = 35 / 0.3 116.7 Kg = = 500 116.7 383.3 Kg = 45 wt% = 0.45 = = 35 / 0.45 77.8 Kg Water vapour removed from the evaporator is = = 500 77.8 422.2 Kg Incremental water removal achieved is = = 422.2 383.3 38.9 Kg % increase in water removal % improvement in water removal after overhaul = = 38.9 / 383.3 * 100 10.14 % Present scenario : Concentration of solids in product (output) Mass balance across the evaporator : Amount of product (output) from the evaporator Water vapour removed from the evaporator is Design scenario : Concentration of solids in product (output) Mass balance across the evaporator : Amount of product (output) from the evaporator L -5 A process plant is planning to implement a waste heat recovery project. The various activities from procurement to commissioning are given in the table below along with their duration and dependency. _______________________ Bureau of Energy Efficiency 9 Paper 1 SET A Activity A. B. C. D. E. F. G. H. I. Predecessor A A C C B&D D&E F,G,H Time in Weeks 3 5 4 6 5 3 2 1 2 a) Construct a PERT/CPM network diagram for the above project. (5 Marks) b) Compute the earliest start, earliest finish, latest start, latest finish and slack for all the activities (3 Marks) c) Compute the project duration. (1 Mark) d) Identify the critical activities and the critical path(s). (1 Mark) Ans a) PERT/CPM network diagram for a project b) Early start (ES), Early Finish (EF), Latest start (LS), Latest finish (LF) and slack for all the activities. Activity Duration ES EF LS LF Slack (LS-ES) or (LF-EF) A 3 0 3 0 3 0 B 5 0 5 6 11 6 C 4 3 7 3 7 0 D 6 3 9 5 11 2 E 5 7 12 7 12 0 _______________________ Bureau of Energy Efficiency 10 Paper 1 SET A F 3 7 10 10 13 G 2 9 11 11 H 1 12 13 12 13 0 I 2 13 15 13 15 0 13 3 2 X1 and X2 are dummy activities c) Critical Path : A- C- E- H- I d) Total time on critical path (project duration) : 15 weeks L- 6 A medium size chemical plant receives electricity from grid and also generates electricity from coal based Captive Power Plant (CPP). Coal is also used for process requirements. The fine coal from CPP is sold to neighboring plant. The annual energy details are given below: Electricity purchased from grid Electricity exported to grid Power generation from CPP Power Supplied from CPP to Process plant Fine coal sold to neighboring unit Coal used for process plant GCV of coal Heat rate of CPP Annual Operating Hours 5 MU 11 MU 36 MU 25 MU 1000 ton 5000 ton 4500 kcal/kg 3500 kcal/kWh 7200 Calculate a. Energy usage in TOE (Tons of oil equivalent) b. Coal used in CPP c. Calculate the CPP operating power in MW. Ans (5 Marks) (3 Marks) (2 Marks) Energy usage in TOE (Tons of oil equivalent) Grid electricity Imported = (5 x 106 kWh)x (860 kcal/kWh) = (+) 43 x 108 kcals/year 6 Power generated from CPP = (36 x 10 kWh)x (3500 kcal/kWh) = (+) 1260 x 108 kcals/year 3 Coal imported for process = (5000 x 10 kg)x (4500 kcal/kg) = (+) 225 x 108 kcals/year 6 Power exported to grid = (11 x 10 kWh)x (3500 kcal/kWh) = (-) 385 x 108 kcals/year 3 Coal fines exported to neighbour = (1000 x 10 kg)x (4500 kcal/kg) = (-) 45 x 108 kcals/year Net annual energy consumption = ( 43+1260+225)-(385+45) = (+) 1098 x 108 kcals/year a. Energy usage in TOE (1 MTOE = 107 kcals) b. Coal used in CPP = (1098 x 108 kcals/year) / (107) = 10980 MTOE = ( (36 x 106 kWh)x (3500 kcal/kWh) ) / (4500 kcal/kg) = 28 x 106 kgs Coal/ Year = (28 x 106 )/103 = 28000 Tons Coal/ Year c. Calculate the CPP operating MW = (36 x 106 kWh/year)/ (7200 hrs/year) = 5000 kW = 5 MW . . End of Section III .. . _______________________ Bureau of Energy Efficiency 11

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