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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Experiment Data Take the following data for the syringe injection pump 2/ Inner diameter of syringe barrel: D = 1.5 cm Inner diameter of the needle shaft of the syringe: d = 0.5 mm The thread pitch of lead screw: pt = 0.75 mm Lead screw rotation velocity (rpm): n Calculations Liquid injection rate (cm³/hr) Q = pt*n* 60 * * D²/4 Velocity of liquid in syringe barrel (cm/min) v = 4Q/ (60** D²) Velocity of liquid in syringe needle (cm/min) v₁ = 40/ (60* *d²) K Find the rotation velocity of lead screw n and the velocity of liquid in syringe needle if the required injection dose is 1. 10 cm³ in 3 hours (continuous injection) 2. 20 cm³ in 12 hours (discontinuous injection, 5 cm³ each 3 hour, injection time = 1 min). Discus the rece Solution Calculate the liquid injection rate Q = P₁ xnx60x² = 0.075xnx60xx1.5 = 7.94n- cm³ hr Calculate the velocity of liquid in barrel V₁ == 40 60xπx D² 4x7.94n 60xx1.5² = 0.07ncm hr Calculate the velocity of liquid in needle 40 60xπxd² 4x7.94n 60xπx 0.05² hr…
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The small cylinder C has a mass of 10 kg and is attached to the end of a rod whose mass may be neglected. The frame is subjected to a couple M (8t² + 5) N-m, where t is in seconds, and the cylinder is subjected to a force of 60 N, which is always directed as shown. The cylinder has a speed v0 = 2 m/s when t = 0. (Figure 1) Figure 99°F Sunny 0.75 m M = (8² + 5) N-m 60 N < 1 of 1 Pro