FLUID MECHANICS FUND. (LL)-W/ACCESS
4th Edition
ISBN: 9781266016042
Author: CENGEL
Publisher: MCG CUSTOM
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Textbook Question
Chapter 5, Problem 120P
Air enters a steady-flow compressor at 1 atm and 25°C at a rate of 0.35 m3/s and leaves at a rate of 0.12 m3/s. The density of air at the compressor exit is
(a) 1.2 kg/m3
(b) 1.63 kg/m3
(c)2.48 kg/m3
(d) 3.45 kg/m3
(e) 4.57 kg/m3
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motion is as follows;
1- Dwell 45°.
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3- Dwell 90°.
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---20125
750 X 2.01
1989
Ashaft fitted with a flywheel rotates at 300 rpm. and drives a machine. The torque
required to drive the machine varies in a cyclic manner over a period of 2 revolutions. The torque drops
from 20,000 Nm to 10,000 Nm uniformly during 90 degrees and remains constant for the following 180
degrees. It then rises uniformly to 35,000 Nm during the next 225 degrees and after that it drops to
20,000 in a uniform manner for 225 degrees, the cycle being repeated thereafter.
Determine the power required to drive the machine and percentage fluctuation in speed, if the driving
torque applied to the shaft is constant and the mass of the flywheel is 12 tonnes with radius of gyration of
500 mm. What is the maximum angular acceleration of the flywheel.
35,000
TNM
20,000
10,000
0
90
270
495
Crank angle 8 degrees
720
chanism shown in figure below, the crank OA rotates at 60 RPM counterclockwise. The
velocity diagram is also drawn to scale (take dimensions from space diagram). Knowing that QCD is rigid
plate, determine:
a. Linear acceleration of slider at B,
b.
Angular acceleration of the links AC, plate CQD, and BD.
D
Space Diagram
Scale 1:10
A
ES
a
o,p,g
b
Velocity Diagram
Scale 50 mm/(m/s)
d
Chapter 5 Solutions
FLUID MECHANICS FUND. (LL)-W/ACCESS
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