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BEE Energy Sample / Model Paper 2023 : Energy

10 pages, 132 questions, 0 questions with responses, 0 total responses,

Md. Mostaqur Rahman
Bangladesh University of Engineering and Technology (BUET), Dhaka

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Power Division, Ministry of Power, Energy and Mineral Resources 4th Energy Auditor Certification Examination-2023 Paper- 1 Candidate s Roll No. 2 0 2 3 0 5 Invigilator s Signature ___________________________ Sustainable and Renewable Energy Development Authority (SREDA) Examinee s Name _________________________________________________ Paper 1: Fundamentals of Energy Management and Energy Audit Total Marks- 150, Time- 3.00 Hours, Date: 23 May 2023 A MCQ Answer (Section A): 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 For Official Use only MCQ Short Question Long Question Total Marks : : : : [ [ [ [ ] ] ] ] P1 A (Page 1 of 10) Signature of Examiner Invigilator s Signature 1. This Paper has 50 MCQs + 8 Short Questions + 6 Long Questions = Total 64 Questions. 2. Mark indicated on the right side of each question. 3. Fill in correct circle with permanent ink ballpoint pen shown on the top sheet only corresponding to the MCQ given in Section A. 4. Answer in the blank space provided after each question (short/long). 5. Do not put any sign or write anything on the answer script except written answer. 6. Any unfair means, peer talking, keeping any communication device and misbehavior will lead to cancellation of examination. ___________________________ Important Instruction: P1 A (Page 2 of 10) Section A: MCQ Fill the appropriate circle in the OMR answer sheet at the top page. 1 x 50 =50 1 2 3 4 5 6 The simplest technique for scheduling of tasks and tracking the progress of energy management projects is called A) Gantt chart C) PERT B) CPM D) WBS The Metric Tons of Oil Equivalent (MTOE) value of 125 tons of coal having GCV of 4000 kCal/kg is A) 40 C) 100 B) 50 D) none of the above Benchmarking helps to A) track performance change over time C) both a & b B) compare with best/average performance D) none of the above Which of the following is the predominant loss in a furnace oil fired boiler? A) dry flue gas losses C) heat loss due to radiation and convection B) heat loss due to moisture in air D) heat loss due to moisture in fuel Energy supplied by electricity, Q in kCal is equal to _____ A) kWh x 8.6 C) kWh x 860 B) kWh x 86 D) None of the above Energy monitoring and targeting is built on the principle of _____ . A) production can be reduced to achieve C) You cannot manage what you do not reduced energy consumption measure B) Consumption of energy is proportional to production rate 7 8 9 D) None of the above. A CUSUM graph follows a random fluctuation trend and oscillates around. A) 100 C) 0 B) 100% D) None of the above A list of instruments and what they measure are given below. Which pair is incorrect in this list A) Gas Analyzer-CO C) Tachometer-Speed B) Manometer-Pressure D) Lux Meter-Lumens Which among the following has the highest flue gas loss on combustion due to Hydrogen in the fuel? A) Natural Gas C) Coal B) Furnace Oil D) HSD P1 A (Page 3 of 10) 10 Which of the following has the highest specific heat? A) Copper C) Iron B) Alcohol D) Water 11 Stroboscope is used to measure A) Flow C) Oxygen B) Speed D) Humidity 12 Which one is not a mandatory agenda for a management review meeting as per ISO 50001:2018 A) Status of non-conformities C) External Audit Result B) Internal Audit Result D) Status of Action Plan 13 The power generation potential in mini hydro power plant for a water flow of 3 m3/s with a head of 14 meters and with a system efficiency of 55% is A) 226.6 kW C) 23.1 kW B) 76.4 kW D) None of the above 14 Red wood seconds is a measure of A) Density C) Specific gravity B) Viscosity D) Flash Point Gas 15 Energy Intensity is the ratio of A) Fuel Consumption / GDP C) GDP/ Energy Consumption B) GDP/Fuel Consumption D) Energy Consumption / GDP 16 Doppler effect principle is used in the following instrument A) lux meter C) infrared thermometer B) ultrasonic flow meter D) flue gas analyser 17 Absolute Pressure is A) Gauge pressure C) Atmospheric pressure B) Gauge pressure + Atmospheric pressure D) Gauge pressure - Atmospheric pressure 18 If we heat the air without changing absolute humidity, relative humidity (%) willA) increase C) no change B) decrease D) can t say 19 Fuel cell using methanol as anode and oxygen as cathode is A) proton exchange membrane fuel cell C) alkaline fuel cell B) phosphoric acid fuel cell D) direct methanol fuel cell 20 1 kg of wood contains 15% moisture and 5% hydrogen by weight. How much water is evaporated during complete combustion of 1kg of wood? A) 0.6 kg C) 0.15 kg B) 200 g D) None of the above P1 A (Page 4 of 10) 21 Energy sources that are inexhaustible are known as A) Commercial Energy C) Secondary Energy B) Primary Energy D) Renewable Energy 22 A chemical process is said to occur under unsteady state, if the A) Inventory changes do not take place C) Flow rates and composition both are time dependent B) Ratio of streams entering/leaving are D) None of the above. independent of time 23 Volume percentage for gases is equal to the A) Weight percentage C) Weight percentage only for ideal gases B) Mole percentage D) Mole percentage only for ideal gases 24 Sankey diagram is used for showing A) Mass balance C) Heat balance B) Energy losses D) Both (b) and (c) 25 The objective of material and energy balance is to assess theA) input-output C) conversion efficiency B) losses D) all the above 26 Pick the right formula: A) EBIT= Operating Revenue Operating Expenses Interest Expense C) EAT= EBT- Interest Charge Tax Expense B) EBIT= EAT+ Interest Charge + Tax Expense D) EBT= EBIT Amortization and Depreciation Interest Charge 27 Select the Fixed Cost from the following: A) Electricity bill C) Daily labor cost B) Monthly rent D) Spare parts cost 28 A company wants to install solar panels at a cost of BDT 30,000 and has the option to pay the full amount after 2 years with annual compound interest rate of 12%. How much the company will pay after 2 years? A) BDT 37,200 C) BDT 37,526 B) BDT 35,000 D) BDT 37,632 29 If a project has a net present value equal to zero, then: I. the present value of the cash inflows exceeds the initial cost of the project. II. the project produces a rate of return that just equals the rate required to accept the project. III. the project is expected to produce only the minimally required cash inflows. IV. any delay in receiving the projected cash inflows will result in a negative NPV. A) II and III only C) II and IV only B) I, II, and IV only D) II, III, and IV only P1 A (Page 5 of 10) 30 Which of the following is true about sensitivity analysis? A) Higher the sensitivity, lower the risk of C) Higher the sensitivity, higher the risk the project. of the project. B) Higher the sensitivity, lower the value D) Higher the sensitivity, higher the of the project. value of the project. 31 Power and Harmonic analyzer is not used to measure A) Power factor C) Voltage B) Motor speed D) Frequency 32 Critical path identifies the A) Optimum time for a project C) Maximum time for a project B) Minimum time for a project D) Actual time for a project 33 If the optimistic, pessimistic and most likely time for a task is 4, 10 and 7 weeks respectively, what is the expected time? A) 10 C) 7 B) 6 D) 8 34 Apart from Boilers and generators the largest energy consumed in industries is A) Lighting C) Air conditioner B) Motors D) Other services 35 The instrument used for measuring air velocity in ventilation is called: A) Thermo-anemometer C) Ultrasonic Flow Meter B) Thermo- hygrometer D) None of the above 36 Value of Betz limit is: A) 59% B) 49% C) 39% D) 29% 37 What is the energy conversion efficiency of a 175-watt hour solar panel that measures 0.75 X 1.50 meters, if the solar insolation is 1000W/ ? A) 12% C) 15% B) 13.6% D) 15.6% 38 When a 100 W electric bulb is connected to a 250V supply, the current flowing in the bulb is: A) 0.2A C) 0.3A B) 0.4A D) None of the above 39 Which of the following is not true for a preliminary energy audit A) estimate the scope for savings C) use existing or easily obtainable data B) identify low cost/no cost measures D) construct an energy balance 40 In a coal fired boiler, hourly consumption of coal is 1000 kg. The ash content in the coal is 30%. If the boiler operates 24 hours/day and 5% of the ash formed is carried away by the flue gas, the quantity of ash collected at the bottom of boiler per day will be: A) 6840 kg C) 1500 kg B) 7200 kg D) None of the above P1 A (Page 6 of 10) 41 What is the heat required to melt 2 kg of ice from zero degree to liquid water at zero degree in KJ? A) 672 C) 6048 B) 6000 D) 8374 42 When the current lags the voltage in an alternating current system, it is caused mainly due to A) resistive load C) inductive load B) capacitive load D) None of the above 43 Which is a greenhouse gas A) Sulfur Dioxide C) Nitrous Oxide B) Nitrogen D) None of the above 44 If feed of 100 tonnes with 40% moisture, is dried to 20% moisture, the amount of water vapour evaporated would be A) 20 C) 30 B) 28 D) 40 45 An indication of sensible heat content in air-water vapour mixture is A) wet bulb temperature C) density of air B) dew point temperature D) dry bulb temperature 46 Which one is not an energy consumption benchmark parameter? A) kCal/kWh of electricity generated C) kW/ton of refrigeration B) kg/ deg C D) kWh/kg of yarn 47 An electric heater consumes 1000 Joules of energy in 5 seconds. Its power rating is: A) 200 W C) 5000 W B) 1000 W D) None of the above 48 An oil-fired boiler is retrofitted to fire coconut shell chips. Boiler thermal efficiency drops from 82% to 70%. What will be the percentage change in energy consumption to generate the same output A) 12% increase B) 14.6% increase C) 17.1% decrease D) 17.1% increase 49 The primary energy content of fuels is generally expressed in terms of ton of oil equivalent (toe) and is based on the following conversion factor A) 1 toe=10x106 kCal C) 1 toe=41870 MJ B) 1 toe=11630 kWh D) All of the above 50 The time between its earliest and latest start time, or between its earliest and latest finish time of an activity is A) delay time C) critical path B) slack time D) start time P1 A (Page 7 of 10) Section B: Short Question 01 Calculate the boiler efficiency where the Turbine heat rate is 1930 kCal/ kWh and the generating unit heat rate is 2250 kCal/kWh. 02 What is a Sankey diagram and what are its uses? Explain with an example. 03 What are the different phases of detailed energy audit and list down the 5 5 aims of the preliminary site visit? 04 Marks 5 What are the 3-time estimate used for constructing PERT Network? One 5 of the activities has 3 time estimate of 4 weeks, 5 weeks and 6 weeks in a PERT Network diagram. Find out the expected time to complete the activity and its variance of the activity i) Three-time estimates are: a) Optimistic time b) Most likely time c) Pessimistic time 05 Explain following terms in context of Energy Management system i. Energy Performance Indicator. ii. Energy Baseline 5 06 Find expected power output of a wind turbine having following specifications 5 Rotor Diameter= 6m Coefficient of performance= 0.3 Generator efficiency =0.8 Gearbox efficiency 0.9 Assume: Air density: 1.2 kg/m3 Average Wind speed =11 m/s Assume suitable values of necessary data (if required) 07 Consider a foundry which during a monitoring programme produces the following sample data: Month 1 2 3 4 5 6 7 8 9 Production, Tons/month 380 440 460 520 320 520 240 620 600 Energy Use, Tons/month 340 340 380 380 300 400 280 424 420 Use linear regression technique to predict Energy use when the production is 500 Tons. P1 A (Page 8 of 10) 5 08 A continuous centrifuge separates 36,000 kg of whole milk containing 4% fat in 6-hour period into skim milk with 0.40% fat and cream with 40 % fat. Find out the flow rates of whole milk, cream and skim milk using mass balance. 5 36000 Flow rate of whole milk = 6 = 6000 / Let, flow rate of cream = x So as per mass balance, flow rate of skim milk= 6000-x For fat 6000*.04=(6000-x)*.004+x*.4 x= 545.45 6000-x=5454.55 Flow rate of skim milk=5454.55 kg/hr Flow rate of cream = 545.45 kg/hr Section C: Long Question 01 ABC Company is considering implementation of one option out of three, (a) Marks 10 replacement of existing boiler with energy efficient once-through steam boiler, (b) installation of co-generation system, (c) installation of low-e pair glass and solar reflective glass, elevator with PM motor and LED lighting. Following are the cash flow scenario for each option. Options Year 0 Year 1 Year 2 Year 3 Year 4 Year 5 A (100,000) 27,500 27,500 27,500 27,500 27,500 B (115,000) 30,000 30,000 30,000 30,000 30,000 C (130,000) 35,000 35,000 35,000 35,000 35,000 Calculate NPV, Payback period and PI for all three options. Assume cost of capital is 10%. Which option the company should undertake? 02 A 500 MW coal plant based on conventional pulverized fuel has a gross 2x5 efficiency of 38%. The Gross calorific value of the coal used is 4000 kCal/kg with 40% total carbon. A supercritical unit of 500 MW replaces the plant with a gross efficiency of 40% using the same characteristic coal. Calculate the following (a) Specific coal consumption after replacement (b) Amount of coal and carbon di-oxide saved during a year if the plant works for 8000 hours. 03 A project has the following activities, precedence relationships, and time estimates in weeks: P1 A (Page 9 of 10) 5+4+1 Activity Immediate Optimistic Most Likely Pessimistic Predecessors Time Time Time A 15 20 25 B 8 10 12 C A 25 30 40 D B 15 15 15 E B 22 25 27 F E 15 20 22 G D 20 20 22 a) Draw the network diagram (expected time may be rounded to the nearest whole number) b) Identify the critical path and c) Determine the project duration. 04 In a food processing plant, the monthly production related variable energy consumption was 1.9 times the production and the non-production related fixed energy consumption was 1400 kWh per month up to December of the previous year. In the month of January, a series of energy conservation measures were implemented. Using CUSUM technique, develop a table and calculate the energy savings for the subsequent 6 months period up to the month of June from the data given below. Month Jan Feb Mar Apr May Jun Production (Kg) 62000 71000 75000 59000 62000 73000 10 Actual Energy Consumption 113600 139000 158000 119300 123700 143600 05 Skim milk is prepared by the removal of some of the fat from whole milk. This skim milk is found to contain 90.5% water, 3.5% protein, 5.1% carbohydrate, 0.1% fat and 0.8% ash. If the original milk contained 4.5% fat, calculate its composition assuming that fat only was removed to make the skim milk and that there are no losses in processing. 06 a) Two induction motors are running simultaneously are fed from a single source. Motor 1 is rated 415V, 3 phase, 20kVA, 0.8 PF. Motor -2 is rated 415V, 3 phase, 10 kVA, 0.9 PF. If the grid voltage is 415V, find the value of real power and line current drawn from the source. b) Briefly describe Plan-Do-Check-Act (PDCA) cycle. P1 A (Page 10 of 10) 10 2x5

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