Question 3 The following is an observation made during a trial on a 4-stroke diesel engine. The engine absorbs 10 kW (frictional power) when driven by an electric motor for startup. Speed of engine Brake torque Fuel used Calorific value of fuel Air supplied Cooling water circulated Outlet temperature of cooling water Temperature of exhaust gas Room temperature Specific heat of water Specific heat of exhaust gas 1750 rpm 327.4 Nm 15 kg/h 42000 kJ/kg 4.75 kg/min 16 kg/min 65.8 °C 400 °C 20.8 °C 4.19 kJ/kgK 1.25 kJ/kgK

Question 3 The following is an observation made during a trial on a 4-stroke diesel engine. The engine absorbs 10 kW (frictional power) when driven by an electric motor for startup. Speed of engine Brake torque Fuel used Calorific value of fuel Air supplied Cooling water circulated Outlet temperature of cooling water Temperature of exhaust gas Room temperature Specific heat of water Specific heat of exhaust gas 1750 rpm 327.4 Nm 15 kg/h 42000 kJ/kg 4.75 kg/min 16 kg/min 65.8 °C 400 °C 20.8 °C 4.19 kJ/kgK 1.25 kJ/kgK

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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OBB Occ ODD QUESTION 7 What is the entropy change for an energy reservoir at 700°C that transfers 1500KJ of heat to a heat engine? (5 Points) Please include your calculations in the PDE submission and mark your answer on Blackboard. QUESTION 8 Calculate the entropy change, in kJ/K, of 10 kg of silver when its temperature increases from 20°C to 100°C (cy of silver 0 235 kJkgk) (5 Points) Please include your calculations in the PDE submission and mark your answer.on Blackboard. QUESTION 9 An engineer claims that they designed a nozzle that increases the velocity of air flow from 50 m/s to 100 m/s. However, due to unforeseen issues, the exit velocity is measured as 75 m/s Find the isentropic efficiency of this nozzle. (5 Points) Please include your calculations in the PDF submission and mark your answer on Blackboard, QUESTION 10 Steam enters in an adiabatic turbine steadily at 4 MPa and 85% quality, Steam leaves the turbine as saturated vapor at 10°C If the mass flow rate of the steam is…
QUESTION 3 A single-cylinder, 4-stroke, 3-liter gasoline engine operates at 646 rpm and a compression ratio of 9. The pressure and temperature at the intake are 101.0 kPa and 32 °C respectively. The fuel used has a heating value of 42,500 kJ/kg, the air-fuel ratio is 14, and 77.2 % mechanical efficiency. The length of the indicator card is 55.1 mm with an area of 503.7 mm² and the spring scale is 0.85 bar/mm, considering a volumetric efficiency of 93.6% and a 24% excess air. Determine Brake Heat Rate in kJ/kW-hr. Note: Use two (2) decimal places in your solution and answer.
d. Analysis of the Diesel Cycle[Explain the Derivation of the following in relation to the diagram]: 1.) QA 2.) Qr 3.) W 4.) thermal efficiency - e 5.) the compression ratio - rk 6.) the cut off ratio - rc 7.) Derivation of the formula for e Process 1-2 Process 2-3 Process 3-4 8.) Relation among rk, rc, and re(expansion ratio)
A. Discuss how the (Cetane & Octane ) numbers are affected by the following engine parameters: А. 1) Ignition delay 2) Method of injection 3) Engine Design 4) Compression ratio 5) Type of ignition 6) Flame speed В. Discuss Why? 1) The two-stroke cycle engine must always have an intake pressure boost. 2) In compression ignition engines, no fuel is added to the incoming air, so that compression is done on air only. 3) In two- stroke SI engines, scavenging lasts until piston passes BDC and closes intake and exhaust ports. 4) In Dual cycle, combustion occurs once at constant volume and continued at constant pressure.
Question 11 A 4 stroke gasoline reciprocating internal combustion engine operating stoichiometrically in an environment at standard temperature and pressure consumes 0.8 kilograms of fuel per hour and it has a displacement of 0.77 litres. The engine speed is 2,714 revolutions per minute. Assume the ambient air density is 1.2 kg/m3. What is the volumetric efficiency of the engine. Enter your answer as a rounded percentage. e.g., if the volumetric efficiency is 63.6%, enter the number 64.
ient/take/launch.jsp?course_assessment_id=_26832_1&course_id%3_10885_1&content_id3_625774 18step3r * Question Completion Status: Calculate the specific heat rejected during the cycle to one decimal place and include the correct SI unit (J, kg,C). QUESTION 31 An ideal gas Diesel engine, that has an inlet temperature and pressure of 24 °C and 102 kPa respectively with a compression ratio of 22:1. The maximum cycle temperature is 1,260 C. Take Specific heat at constant pressure and constant volume for air as 1.005 kJ/kg K and 0.717 kJ/kg K respectively. Calculate the specific heat received to one decimal place and include the correct SI unit (J..). Save All Ansy Cliek Save and Submit to save and submit. Click Save All Answers to save all answers. 099d6d70-5984-1. jpg- O Type here to search
true OR false 1. An inline 4 cylinder engine with a diameter of 4 in and stroke of 5 in has a piston displacement of 4 Liters. 2. A stream with depth of 6 ft and width of 2 m flowing at 8 ft/s will provide a mass flow rate of 96 slug per second. 3. A tractor pulling a disc plow with an average draft of 3480 lb and operating at a speed of 3.5 mph has a draft power of 32.48 horses.
2. Compare the performance of diesel and gasoline powered vehicle in terms of torque, power and car handling.
Regarding the over-all engine performance, the following measures of performance will have comparative significance with accordance to the reliability, durability, and maintenance. I. At maximum rating points: II. At all speeds at which the engine will be used with full throttle (control) or with maximum fuel-pump setting. III. At all useful systems of operation and particularly in those in which the engine is run for long periods of time. Explain each of the above factor in detail.
OCTOBER 021 Q1 The following results were objained during a test on a two-cylinder, ur-atroke cycle, oil engine over a period of one hour Cylinder diameter, 108 mm. Pistop stroke, 135 mm Speed, 16 5rev/ Brake torgue, 90 Nm Fuel consumption, 2:5kg. Calorific value of fuel, 45 500 k/kg Mechanical efficiency, 82%. The exhaust gases, on leaving the cylinders were passed through an cahaust gas calorimeter and raised the temperature of 215kg oỆ waler from Determine, (n) the brake thermal efficicncy, 1b) the percemtage of the energy supplied by the fuel whch is carried away by the cocling water, Inction and radistion. () the indicated mean effective pressure, d) the indicated specific fuel consumplion
5. If diesels are more efficient, why aren't car companies using more diesel engines? List at least 1 additio "pro' and 1 additional "con" of a diesel engine.