18 The power output of a six cylinder four-stroke engine is absorbed bya water brake for which the law is WN/20000 where the brake load,W is in Newton and the speed, N is in rpm. The air consumption ismeasured by an air box with sharp edged orifice system. The followingreadings are obtained.Orifice diameter30 mmBore100 mmStroke120 mmBrake load560 N%3DC/H ratio by massCoefficient of dischargeAmbient pressurePressure drop across orificeTime taken for 100 cc of fuel consumptionAmbient temperatureFuel density83/170.6%3D1 bar14.5 cm of Hg20 s27 °C831 kg/m³Calculate (i) the brake power (ii) the torque (iii) the brake specific fuelconsumption (iv) the percentage of excess air and (v) the volumetricefficiency

Answered: Image /qna-images/answer/b9a99b88-9103-444a-a93f-370651ea5338.jpg

Answered: ar 5 cm °C 1 kg/

Engineering

Mechanical Engineering

ar 5 cm °C 1 kg/

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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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

18 The power output of a six cylinder four-stroke engine is absorbed by
a water brake for which the law is WN/20000 where the brake load,
W is in Newton and the speed, N is in rpm. The air consumption is
measured by an air box with sharp edged orifice system. The following
readings are obtained.
Orifice diameter
30 mm
Bore
100 mm
Stroke
120 mm
Brake load
560 N
%3D
C/H ratio by mass
Coefficient of discharge
Ambient pressure
Pressure drop across orifice
Time taken for 100 cc of fuel consumption
Ambient temperature
Fuel density
83/17
0.6
%3D
1 bar
14.5 cm of Hg
20 s
27 °C
831 kg/m³
Calculate (i) the brake power (ii) the torque (iii) the brake specific fuel
consumption (iv) the percentage of excess air and (v) the volumetric
efficiency

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