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14th National Certification Exam Energy Managers & Auditors AUGUST 2013 Paper 3

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Paper 3 Set A KEY 14th NATIONAL CERTIFICATION EXAMINATION 2013 FOR ENERGY MANAGERS & ENERGY AUDITORS PAPER 3: Energy Efficiency in Electrical Utilities Date: 25.08.2013 Section I: Marks: 50 x 1 = 50 The gross efficiency of a coal based power generating unit with a gross heat rate of 2490 kcal/kWh is b) 34.5 % c) 33.3% d) 45.2% The efficiencies of a power plant and transmission systems are 40%, and 97% respectively. The percentage loss of the distribution system of the same network is 23% . The cascade efficiency of generation ,transmission and distribution system is given by a)8,92 % 3. Max. Marks: 150 Answer all 50 questions Each question carries one mark Please hatch the appropriate oval in the OMR answer sheet with HB Pencil, as per instructions a) 40% 2. Duration: 3 HRS OBJECTIVE TYPE (i) (ii) (iii) 1. Timings: 0930 1230 HRS b) 29.87% c) 40 % d) 23% The rating of power factor correction capacitors at induction motor terminals should be a) 90% of no load magnetizing kVAr of induction motor b)100 % of no load magnetizing kVAr of induction motor c) 80% of no load magnetizing kVAr of induction motor d) none of the above 4. Select the correct statement: Power factor a) is the ratio of active and reactive power b) is the ratio of reactive and apparent power c) is the ratio of active and apparent power d) of a pure inductive and capacitive load is unity 5. The Energy Performance Index (EPI) of a building as per Energy Conservation Building Code (ECBC) and as defined in the Energy Conservation Act,2001 is: a) kWh per square meter per year c) kW per square meter _______________________ Bureau of Energy Efficiency b) kWh per square meter d) kWh per year 1 Paper 3 Set A KEY 6. If the maximum demand is 3500 kVA at 0.88 p.f., the maximum demand will reduce by______ kVA if PF is improved to 0.98 : a) 3143 7. b) 357 c) 3897 The performance of rewinding of an induction motor can be assessed by which of the following factors? a) no load current c) load current 8. 9. a) 8 b) 6 c) 4 d) 2 A 7.5 kW, 415 V, 14.5 A, 1460 RPM rated 3 phase induction motor with full load efficiency of 90%, draws 9.1 A and 4.6 kW of input power. The percentage loading of the motor is about b) 41.75 kW c) 5.48 kW b) 3400 kVA d) 47.79 kW c) 2920 kVA b) less c) same d) 1800 kVA d) sometime less or more Which parameters need to be measured to assess the percentage loading of a motor by slip method neglecting voltage correction? a) motor speed c) operating motor speed and frequency 14. d) none of the above The rating of the p.f correction capacitors at motor terminals for a 37 kW, 2 poles induction motor will be______ in comparison to the same sized induction motor of 6 poles a) more 13. c) 67.5 % If the apparent power drawn over a recording cycle of 30 minutes is 5000 kVA for 0.5 minutes, 3400 kVA for 20 minutes and 1800 for 9.5 minutes, the MD recorder will compute MD as a) 5000 kVA 12. b) 61.3 % The power input to a rotor of three phase induction motor is 42.3 kW. If the induction motor is operating at a slip of 1.30 % the total mechanical power developed will be : a) 42.3 kW 11. b) stator resistance per phase d) both no load current and stator resistance per phase For a synchronous speed of 1500 rpm, at a given mains frequency of 50 Hz, the induction motor will have _________number of poles. a) 55.2 % 10. d) maximum demand will not reduce b) synchronous speed d) operating current Isothermal power of a compressor depends on a) absolute intake pressure c) free air delivered _______________________ Bureau of Energy Efficiency b) pressure ratio d) all of the above 2 Paper 3 Set A KEY 15. Reduction in the delivery pressure of an air compressor working at 7 bar, by 1 bar would reduce the power consumption by a) 2 3 % 16. b) 4 - 5 % c) 6 - 10 % d) none of the above Which of the following is correct for air compressors? a) for every 5.5oC drop in the inlet air temperature, the increase in energy consumption is by 2% b) for every 4oC rise in the inlet air temperature, the increase in energy consumption is by 1% c) for every 4oC rise in the inlet air temperature, the decrease in energy consumption is by 1% d) the energy consumption remains same irrespective of inlet air temperature 17. The Free Air Delivery of a reciprocating air compressor is directly proportional to a) speed 18. b) pressure c) volume Which of these desiccant compressed air dryers uses dry compressed air for regenerating the desiccant? a) blower reactivated type c) heat of compression type 19. b) heatless purge type d) all of the above The unit of specific humidity in a psychrometric chart is a) grams moisture/kg of dry air c) grams moisture/kg of air 20. b) 9.3 c) 7.2 b) 200 c) 661 d) 2.65 In an air conditioning system analysis which one temperature is sufficient to determine the enthalpy of air? a) dry bulb temperature c) ambient temperature 23. d) none of the above Chilled water enters an evaporator at 100C and leaves at 60C. The flow rate of chilled water was measured as 200 m3/hr. The tons of refrigeration capacity is a) 265 22. b) moisture percentage in air d) all of the above The COP of a vapour compression refrigeration system is 3.1 If the motor draws power of 9.3 kW at an operating efficiency of 88%, the tonnage of refrigeration system is about a) 8.2 21. d) all of the above b) wet bulb temperature d) none of the above The head generated by a centrifugal pump is: a) independent of the density of the liquid being pumped b) directly proportional to the density of the liquid being pumped c) inversely proportional to the density of the liquid being pumped d) proportional to the square of the density of the liquid being pumped _______________________ Bureau of Energy Efficiency 3 Paper 3 Set A KEY 24. The driving force for refrigeration in a vapour absorption refrigeration system is a) mechanical energy c) thermal energy 25. b) electrical energy d) chemical energy Which of the following happens to air when it is cooled through evaporation process? a) humidity ratio of the air decreases b) dry bulb temperature of air decreases c) dry bulb temperature of air increases d) enthalpy of outlet air is less than enthalpy of inlet air 26. 27. The relation between COP and kW/TR for a refrigeration system is given by a) kW/TR = 3.516/COP b) kW/TR = COP /3.516 c) kW/TR = 860/COP d) none of the above In which of the following fans the air does not change flow direction from suction to discharge? a) tube axial fan 28. c) propeller fan b) specific ratio c) blade ratio b) dynamic pressure c) total static pressure b) static b) 62.5% c) 56.8% d) none of the above b) head diameter2 d) flow diameter If the speed of the pump is doubled, power goes up by a) 2 times 34. d) all of the above Which of the following is not true for impeller trimming? a) pressure diameter c) power diameter3 33. c) total If the power drawn by the motor driving a pump is 20 kW at a 91% efficiency, and the hydraulic power of a motor pump set is 12.5 kW, the pump efficiency will be__ a) 68.7% 32. d) velocity pressure The inclined manometer connected to a pitot tube is used for measuring which pressure in a gas stream? a) velocity 31. d) impeller ratio The pressure to be considered for calculating the power required for centrifugal fans is___ a) vapour pressure 30. d) all of the above The parameter used by ASME to classify fans, blowers and compressors is a) volume ratio 29. b) vane axial fan b) 6 times c) 8 times d) 4 times The preferred method of flow control for reducing pump flow permanently in a pumping system is------a) throttling b) speed control _______________________ Bureau of Energy Efficiency c) impeller trimming d) none of the above 4 Paper 3 Set A KEY 35. A water pump is delivering 20 m3/hr at ambient conditions. The impeller diameter is trimmed by 10%. This will reduce the pump discharge by a) 18 m3/hr 36. b) 2 m3/hr c) 0.2 m3/hr Increasing the suction pipe diameter in a pumping system will a) reduce NPSHA c) decrease NPSHR 37. b) 3oC b) M = E + B - D b) 90% c) 100% b) 15 m3/ hour c) 0.25 m3/hour b) 0.61 c) 0.69 d) insufficient data d) 6.67 m3/hour d) unity In T-5 Fluorescent Lamp, 5 is indicative of: a) Tube diameter c) 5% Energy Saving with respect to T8 43. d) M = E - B - D If the metered kWh is 95, kVAh is 100 and kVARh is 31, the power factor will be: a) 0.95 42. c) M = E - B + D For a cooling tower if blowdown is 10 m3 /hour and Cycles of Concentration (CoC) is 2.5 the evaporation loss is equal to: a) 25 m3/hour 41. d) 12oC If the wet bulb temperature of air is 380C, then its relative humidity in % is a) 38 % 40. c) 29oC Find the correct equation, if M = makeup water (from the mains water supply), E = losses due to evaporation, B = losses due to blow-down and D = drift losses of a cooling tower: a) M = E + B + D 39. b) increase NPSHA d) increase NPSHR The range of a cooling tower with inlet and outlet temperature as 41o C and 32o C respectively and wet bulb temperature as 29o is a) 9oC 38. d) none of the above b) 5 watt loss d) 5th generation lamp Identify the statement that is not applicable to heat pumps a) transfers heat by refrigerant through a cycle of evaporation and condensation b) an air conditioner can work as a heat pump c) no external energy is required d) a vapour absorption refrigeration system can also work as a heat pump 44. A refrigeration system using which of the following compressors is likely to be most efficient? a) reciprocating 45. b) screw c) scroll d) all the above Which of the following is not true for a fluorescent lamp with electronic ballast a) presence of stroboscopic effect c) increased light output _______________________ Bureau of Energy Efficiency b) energy savings d) no starter required 5 Paper 3 Set A KEY 46. Which of the following with respect to turbocharger in a Diesel engine is true? a) operates using energy of exhaust gases b) decreases supply air pressure to engine c) preheats the combustion air using energy from exhaust gases d) all of the above 47. The refrigerant which can be used both in vapour compression chillers and vapour absorption chiller is a) R22 48. b) R21 c) ammonia Energy efficient distribution transformer core is made up of ______. a) silicon alloyed iron (grain oriented) c) amorphous core - metallic glass alloy 49. b) copper d) none of the above In a transformer on load, if the secondary voltage is one-fourth the primary voltage, then the secondary current will be a) four times the primary current c) one-fourth the primary current 50. d) pure water b) equal to the primary current d) two times the primary current If V1 is actual supply voltage and V2 is the rated voltage of a capacitor, the reactive KVAr produced would be in the ratio of a) V22/V12 b) V12/V22 c) 1 - V22/V12 d) 1 + V22/V12 . End of Section I . Section II: SHORT DESCRIPTIVE QUESTIONS (i) (ii) Marks: 8 x 5 = 40 Answer all Eight questions Each question carries Five marks S-1 A 15 kW, 415 V, 4 pole, 50 Hz, 3 Phase squirrel cage induction motor has a full load efficiency of 92% and power factor of 0.89. Find the following if the motor operates at full load rated values. a) input power in kW b) current drawn by the motor c) RPM at a full load slip of 0.8% Ans: a) Pin (Input power) = 15 / 0.92 = 16.304 kW b) I(Input current) = 16.304 / ( 3 x 0.415 x 0.89) = 25.48 A c) Ns = 120 x f / p = 120 x 50 / 4 = 1500 RPM N = Ns ( 1- S ) = 1500 ( 1- 0.008) = 1488 RPM S-2 In a pumping system the water level is 4 m below the pump centerline. The discharge _______________________ Bureau of Energy Efficiency 6 Paper 3 Set A KEY pressure is 2.60 kg/cm2. The flow rate of water is 1.5 m3 /min. Find out the pump efficiency if the actual power drawn by the pump motor is 14 kW at a motor operating efficiency of 0.88. = = 2.60 kg/cm2 26 metre head. = - 4 metre. Total Head = 26 (-4) = 30 metre Hydraulic Power = = (1.5/60) x 1000 x 9.81 x 30/1000 7.36 kW Shaft input = 14x.88=12.32 Pump Efficiency S-3 Discharge Head Suction Head Ans = 100 x 7.36/12.32 = 59.74 % Harmonic measurements in an electrical system of an industry gave the following results. Current at 50 Hz : 300 A Current at 150 Hz : 42 A Current at 250 Hz : 33 A Calculate the Total Harmonic Distortion in current for the system. Ans 42 2 33 2 I THD x 100 300 300 0.0196 0.0121 x100 17.8% S-4 Air flow measurements using the pitot tube, in the primary air fan of a coal fired boiler gave the following data Air temperature Velocity pressure Pitot tube constant, Cp Air density at 0oC (standard data) = 38oC = 47 mmWC = 0.9 = 1.293 kg /m3 Find out the velocity of air in m/sec. Ans Corrected air density 273 x 1.293 /(273+38) 1.135 kg/m3 Velocity m/s Cp x 2 x 9.81 x p x / 0.9 x 2 x 9.81 x 4 _______________________ Bureau of Energy Efficiency 7 Paper 3 Set A KEY 25.6 m/s x 1.135 / 1.135 S-5 Ans S-6 List five measures to reduce energy consumption in lighting system for buildings, industry and street lighting Reduce excessive illumination levels to standard levels using switching, delamping, etc. (Know the electrical effects before doing delamping.) Aggressively control lighting with clock timers, delay timers, photocells, and/or occupancy sensors. Install efficient alternatives to incandescent lighting, mercury vapor lighting, etc. Efficiency (lumens/watt) of various technologies range from best to worst approximately as follows: low pressure sodium, high pressure sodium, metal halide, fluorescent, mercury vapor, incandescent. Select ballasts and lamps carefully with high power factor and long-term efficiency in mind. Upgrade obsolete fluorescent systems to Compact fluorescents and electronic ballasts Consider lowering the fixtures to enable using less of them. Consider daylighting, skylights, etc. Consider painting the walls a lighter color and using less lighting fixtures or lower wattages. Use task lighting and reduce background illumination. Re-evaluate exterior lighting strategy, type, and control. Control it aggressively. Change exit signs from incandescent to LED. Identify each of the following statement as applicable to Vapor Compression Refrigeration System (VCR) and to Vapor Absorption Refrigeration System(VAR). (Need not copy and write the following statements in the Answer book; only write against the statements A, B, C, D etc. whether it is applicable to VCR or VAR ) Ans A. No effect of reducing the load on performance. B. Uses low grade energy C. Liquid traces in suction line may damage the compressor. D. Moving parts are only in the pump and hence operation is smooth. E. The system can work on lower evaporator pressures also without affecting the COP. F. Performance is adversely affected at partial loads. G. Liquid traces of refrigerant present in piping at the exit of evaporator H. Using high-grade energy like mechanical work I. Moving parts are more; therefore, more equipment maintenance and noise J. The COP decreases considerably with decrease in evaporator pressure A. VAR B. VAR C. VCR D. VAR E. VAR F. VCR G. VAR H. VCR _______________________ Bureau of Energy Efficiency 8 Paper 3 Set A KEY I. VCR J. VCR S-7 List any five factors that affect the rate of evaporation of water in cooling towers S-8 Amount of water surface area exposed The time of exposure The relative velocity of air passing over the droplets The RH of air The direction of airflow relative to water. Any other relevant point to be considered Estimate the cooling tower capacity (TR) and approach with the following parameters Water flow rate through CT Specific heat of water Inlet water temperature Outlet water temperature Ambient WBT Ans Cooling tower capacity (TR) = 2 m3/min = 1 kcal/kg C = 43 C = 35 C = 30 C = (flow rate x density x sp.heat x diff. temp)/ 3024 = (2X60) x 1000 x 1.0 x (43-35)/ 3024 = 317.5TR Approach = 35- 30 = 5oC . End of Section - II . Section III: LONG DESCRIPTIVE QUESTIONS (i) (ii) L-1 Marks: 6 x 10 = 60 Answer all Six questions Each question carries Ten marks An efficiency assessment test was carried out for a standard 4 pole squirrel cage induction motor in a chemical plant. The motor specifications are as under: Motor rated specification: 3 phase delta connected,37 kW, 415 Volt, 63 Amps, 1475 rpm, The following data was collected during the no- load test on the motor: Voltage= 415 Volts Current = 17 Amps Frequency = 50 Hz Stator resistance per phase = 0.260 Ohms at 30 0C No load power= 1152 Watts Calculate the following: (i) (ii) (iii) Iron plus friction and windage losses. Stator resistance at 120oC. Stator copper loss at full load at operating temperature of 120oC. _______________________ Bureau of Energy Efficiency 9 Paper 3 Set A KEY (iv) (v) (vi) Full load slip and rotor input assuming rotor losses are slip times rotor input. Motor input assuming that stray losses are 0.5% of the motor rated output power. Motor full load efficiency Ans Let Iron plus friction and windage loss, Pi + fw No load power, Pnl = 1152 Watts Stator Copper loss, P st-300C (Pst.cu) = 3 (17 / 3)2 0.260 = 75.13Watts Pi + fw = Pnl Pst.cu = 1152 75.13 = 1076.87 W (ii) Stator Resistance at 1200C, R1200C = 0.260 120 235 30 235 = 0.3483 ohms per phase (iii) Stator copper losses at full load, Pst.cu 1200C = 3 (63 / 3)2 0.3483 = 1382.3 Watts (iv) Full load slip S = (1500 1475) / 1500 = 0.01666 or 1.66% Rotor input, Pr = Poutput/ (1-S) = 37000 / (1-0.01666) = 37000/0.98334 = 37626.86 Watts (v) Motor full load input power, P input = Pr + Pst.cu 1200C + (Pi + fw) + Pstray = 37626.86 + 1382.3 + 1076.87 + (0.005* 37000) = 40271.03 Watts * where, stray losses = 0.5% of rated output (assumed) (vi) Motor efficiency at full load Efficiency _______________________ Bureau of Energy Efficiency = Poutput Pinput 100 10 Paper 3 Set A KEY = = L2 (37000 / 40271.03) x 100 91.87 % Fill in the blanks: 1. Cavitation may occur in a pump when the local static pressure in a fluid reaches a level below the _________pressure of the liquid at the actual temperature. 2. In a vapour absorption system using ammonia as refrigerant, the absorbent is ______ 3. The system resistance of a fan system is proportional to the ______of flow rate or velocity 4. If the dry bulb temp.is 30 0C and the wet bulb temp. is 30 0C, then the % relative humidity will be _______ 5. Slip ring induction motors are comparatively ________efficient than of the squirrel cage motors of same ratings. 6. In a pumping system with a horizontal discharge, the suction static head is 3 m and the friction head is 21 m. The total head developed by the pump will be ___________ 7. The lowest theoretical temperature to which water can be cooled in a cooling tower is the _________ of atmospheric air 8. The measure of illuminance of a surface in metric units is ________ 9. It is acceptable to run pumps in parallel provided their__ _______ heads are similar 10. When heat load, range and wet bulb temperature are held constant, the cooling tower size is ________proportional to the approach. Ans 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. L-3 Vapour Water Square 100% Less 18 m Wet bulb temperature Lux Closed valve heads Inversely The cooling water circuit of a process industry is depicted in the figure below. Cooling water is pumped to three heat exchangers via pipes A,B and C where flow is throttled depending upon the requirement. The diameter of pipes and measured velocities with non-contact ultrasonic flow meter in each pipe are indicated in the figure. _______________________ Bureau of Energy Efficiency 11 Paper 3 Set A KEY The following are the other data: Measured motor power : 50.7 kW Motor efficiency at operating load: 90% Pump discharge pressure : 3.4 kg/cm2 Suction head : 2 meters Determine the efficiency of the pump Ans Flow in pipe A 22/7 x (0.1)2/4 x 1.5 0.011786 m3/s Flow in pipe B 22/7 x (0.1)2/4 x 1.8 0.014143 m3/s Flow in pipe C 22/7 x (0.2)2/4 x 2.0 0.062857 m3/s Total flow 0.088786 m3/s Total head 34 m 2 m = 32 m Pump hydraulic power 0.088786 x 32 x 9.81 27.9 kW 27.9 x 100/50.7 x 0.9 Pump efficiency L4 61 % a) The size of an engine room to be ventilated is 30 m x 20 m x 5 m. The number of air changes per hour is designed to be 20. If the static pressure rise across the ventilator fan is 15 mm WC and fan efficiency is 70 % find out the motor power drawn at a motor efficiency of 90%. _______________________ Bureau of Energy Efficiency 12 Paper 3 Set A KEY b) A seal air fan for a coal mill is operating with suction damper in 25 % open condition. The power drawn at 50 Hz by fan motor is 120 kW. A VFD is to be installed eliminating the damper operation. It is found that the damper can be completely opened and the fan motor can be operated at 33 Hz. Calculated the power drawn by the fan motor at 33 Hz, assuming that motor and fan efficiency remains constant. a) Flow rate - 30 x 20 x 5 x 20 = 60,000 m 3/hr Motor power - (60,000/3600) x 15/ (102 x 0.7x0.9) - b) Power at 50 Hz - 120 kW Power at 33 Hz - 120 x (33/50)3 - L-5 3.89 kW 34.5 kW a) In an automobile industry a pump-up test was conducted to determine the free air delivery (FAD) of a reciprocating compressor and the following data were obtained: Receiver capacity and additional holdup volume in piping and after-cooler : 4100 litres kg/cm2 (g) Initial pressure: : 1 Final pressure: : 8.5 kg/cm 2 (g) Atmospheric Pressure: : 1.026 kg/cm 2 (a) Ambient air temperature: : 32 oC Final compressed air temperature: : 52 oC Compressor pump up time : 65 secs Calculate the FAD of the compressor in cubic foot per minute. b) Further a leakage test was carried out in the same compressed air system and with the same compressor as in problem a) above and following were the observations: - Compressor was on load for 03 minutes - Compressor was unloaded for 13 minutes - Compressor was drawing 145 kW during load Calculate the following: i. ii. Leakage quantity iii. Specific power consumption iv. Ans % leakage in compressed air system Power lost due to leakage a) Q = P2 P1 V 273 t1 P0 t 273 t 2 Time = 65 sec=1.0833 secs _______________________ Bureau of Energy Efficiency 13 Paper 3 Set A KEY = (8.5 - 1)/1.026X 4.1 /1.0833) X (305/325) = 25.96 m3/min = 25.96 x (3.28)3 = 916 cfm b) i) % Leakage in the system Load time (T) : 03 minutes Un load time (t) : 13 minutes T x 100 (T t ) % leakage in the system 3 x 100 = 18.75 % (3 13) ii) Leakage quantity : : 0.1875 x 916 171.75 cfm iii) Operating capacity (FAD) Actual power consumption : 916 cfm : 145 kW Specific power consumption : 145/916 = 0.1583 kW/cfm iv) Power lost due to leakage leakage quantity x sp power consumption : 171.75 x 0.1583 : L-6 : 27.19 kW Answer any two of the following : (i) In a throttle valve-controlled pumping system with oversized pump list any five options to improve energy efficiency? (Note: Name only options, no explanation required) (ii) Define one Ton of Refrigeration (TR) . How do you calculate TR across the Air Handling Units? (iii) List five energy conservation opportunities in fan system. Ans i) Trim impeller, replace with smaller impeller, install variable speed drive, change pulley if it is belt driven, change to two speed drive, and lower rpm drive ii) A ton of refrigeration is defined as the quantity of heat to be removed in order to form one ton of ice in 24 hours when the initial temperature of water is 0 C. This is equivalent to 50.4 Kcal/min or 3024 Kcal/h in metric system Refrigeration load in TR is assessed as ; _______________________ Bureau of Energy Efficiency 14 Paper 3 Set A KEY TR Q h in h out 3024 Where Q is the air flow in CMH is density of air kg/m3 h in is enthalpy of inlet air kCal/kg h out is enthalpy of outlet air kCal/kg iii) Energy conservation opportunities in fan system Use smooth, well-rounded air inlet cones for fan air intakes. Avoid poor flow distribution at the fan inlet. Minimize fan inlet and outlet obstructions. Clean screens, filters, and fan blades regularly. Use aerofoil-shaped fan blades. Minimize fan speed. Use low-slip or flat belts. Check belt tension regularly. Eliminate variable pitch pulleys. Use variable speed drives for large variable fan loads. Use energy-efficient motors for continuous or near-continuous operation Eliminate leaks in ductwork. Minimise bends in ductwork Turn fans off when not needed. . End of Section III _______________________ Bureau of Energy Efficiency 15

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