195 B/s ll.l12:08Mid-PC.pdf>University or ecnnosogyMechanical Engineering DepartmentMid-Term Exam 2020-2021Subject: Power Plants CyclesTime: 90 min: 2 year: Power Plants EngineeringNote:. All questions carry equal marks.ClassExaminar : Dr.Abdulsatar J.M.HasanDivision: 24/6/202IDate• You have 15 min to upload answer after exam timed out.• Answers posted to the class after 1:45 PM will be ignored.Attempt only Three questionsQ-1: Fill the blanks with suitable words or phrases:1- Steam is preferable to be used as a working fluid in thermodynamic systems due toitsand capability to exchange2-is the criterion that uses mass flow of the working fluid to judge thecost of energy units.3. Employing regeneration in gas turbine power plants aims to reduce4- The power cycle in diesel power plants working on four-stroke principle consists oftheandstrokes only.5-reactors and use it inis responsible for absorbing the heat generated within the nuclearnuclear6. The turbine is directly subjected to radioactive steam inpower plant.Q-2: Solve only Two of the followings:1- Why does the electric power generated always be less than the mechanical powerdeveloped by the turbine? How the difference between them can be estimated?2- Why intercooling and/or reheating are usually cemployed in conjunction withregeneration when improving the performance of gas turbine cycle?3- How the hamful effects of nuclear reactions can be avoided in reactor design?Explain with brief description.1-2Q3: The air enters the compressor of an open cycle gas turbine at 1 bar and 20°C. The overallpressure ratio of the cycle is 4/1. The isentropic efficiencies of the compressor and turbineare 80% and 85% respectively. The air/fuel ratio used is 80/1 with a heating value of41800 kJ/kg. The pressure drop in the combustion chamber is 0,11 bar and thecombustion efficiency is 96%. The air flow rate is estimated to be 5 kg/s. Determine:• Power output in kW.• Cycle thermal efficiency.Assume that the working fluid around the cycle has the properties C, = 1.10 kJ/kg K andy= 14Q4: Four-stroke, single-cylinder diesel power unit when tested gave the following particulars:Brake powerRotational speed9 kW250 rpm0.46 MN/mIndicated mean effective pressureMechanical efficiencyBore/Stroke ratio80%0.66Calculate:• Engine displacement in cm'.• Cylinder bore in cm.

As per bartleby guidelines we are allowed to solve only one question. So I am solving 4th question.…

Q4 Four-stroke, single-cylinder diesel power unit when tested gave the following particulars: M16 250 pm Brake power Rotational speed Indicated mean effective pressure Mechanical efficiency 0.46 MN/m 80% Bore/Stroke ratio 0.66 Calculate: Engine displacement in cm'. • Cylinder bore in cm.

Q4 Four-stroke, single-cylinder diesel power unit when tested gave the following particulars: M16 250 pm Brake power Rotational speed Indicated mean effective pressure Mechanical efficiency 0.46 MN/m 80% Bore/Stroke ratio 0.66 Calculate: Engine displacement in cm'. • Cylinder bore in cm.

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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