Engineering Your Future
9th Edition
ISBN: 9780190279264
Author: William C. Oakes, Les L. Leone
Publisher: Oxford University Press, USA
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Chapter 2, Problem 2.49EAA
To determine
Two engineering majors and compare and contrast the opportunities available in the two.
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2. Read the following Vernier caliper measurements. (The scales have been
enlarged for easier reading.) The Vernier caliper is calibrated in metric units.
(a)
0 1
2
3
4 5
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(b)
1
2
3
4 5 6
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(c)
1 23456
(d)
1 2 3
4 5 6
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Explain why on the interval 0<x<1000 mm and 1000<x<2000mm, Mt is equal to positive 160 Nm, but at x= 0mm and x=1000mm Mt is equal to -160 Nm (negative value!). What is the reason for the sign change of Mt?
20
3.
2-233
2520
Тр
Gears
1079
A pair of helical gears consist of a 20 teeth pinion meshing with a 100 teeth gear. The pinion rotates at
Ta
720 r.p.m. The normal pressure angle is 20° while the helix angle is 25°. The face width is 40 mm and
the normal module is 4 mm. The pinion as well as gear are made of steel having ultimate strength of
600 MPa and heat treated to a surface hardness of 300 B.H.N. The service factor and factor of safety
are 1.5 and 2 respectively. Assume that the velocity factor accounts for the dynamic load and calculate
the power transmitting capacity of the gears.
[Ans. 8.6 kW
Chapter 2 Solutions
Engineering Your Future
Ch. 2 - Prob. 2.1EAACh. 2 - Prob. 2.2EAACh. 2 - Prob. 2.3EAACh. 2 - Prob. 2.4EAACh. 2 - Prob. 2.5EAACh. 2 - Prob. 2.6EAACh. 2 - Prob. 2.7EAACh. 2 - Prob. 2.8EAACh. 2 - Prob. 2.9EAACh. 2 - Prob. 2.10EAA
Ch. 2 - Prob. 2.11EAACh. 2 - Prob. 2.12EAACh. 2 - Prob. 2.13EAACh. 2 - Prob. 2.14EAACh. 2 - Prob. 2.15EAACh. 2 - Prob. 2.16EAACh. 2 - Prob. 2.17EAACh. 2 - Prob. 2.18EAACh. 2 - Prob. 2.19EAACh. 2 - Prob. 2.20EAACh. 2 - Prob. 2.21EAACh. 2 - Prob. 2.22EAACh. 2 - Prob. 2.23EAACh. 2 - Prob. 2.24EAACh. 2 - Prob. 2.25EAACh. 2 - Prob. 2.26EAACh. 2 - Prob. 2.27EAACh. 2 - Prob. 2.28EAACh. 2 - Prob. 2.29EAACh. 2 - Prob. 2.30EAACh. 2 - Prob. 2.31EAACh. 2 - Prob. 2.32EAACh. 2 - Prob. 2.33EAACh. 2 - Prob. 2.34EAACh. 2 - Prob. 2.35EAACh. 2 - Prob. 2.36EAACh. 2 - Prob. 2.37EAACh. 2 - Prob. 2.38EAACh. 2 - Prob. 2.39EAACh. 2 - Prob. 2.40EAACh. 2 - Prob. 2.41EAACh. 2 - Prob. 2.42EAACh. 2 - Prob. 2.43EAACh. 2 - Prob. 2.44EAACh. 2 - Prob. 2.45EAACh. 2 - Prob. 2.46EAACh. 2 - Prob. 2.47EAACh. 2 - Prob. 2.48EAACh. 2 - Prob. 2.49EAACh. 2 - Prob. 2.50EAA
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- OBJECTIVE TYPE QUESTIONS 1. The velocity ratio of two pulleys connected by an open belt or crossed belt is 2. (a) directly proportional to their diameters (b) inversely proportional to their diameters (c) directly proportional to the square of their diameters (d) inversely proportional to the square of their diameters Two pulleys of diameters d, and d, and at distance x apart are connected by means of an open belt drive. The length of the belt is (a)(d+d₁)+2x+ (d₁+d₂)² 4x (b)(d₁-d₂)+2x+ (d₁-d₂)² 4x (c)(d₁+d₂)+ +2x+ (d₁-d₂)² 4x (d)(d-d₂)+2x+ (d₁ +d₂)² 4x 3. In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then (a) open belt drive is recommended (b) cross belt drive is recommended (c) both open belt drive and cross belt drive are recommended (d) the drive is recommended depending upon the torque transmitted Due to slip of the belt, the velocity ratio of the belt drive 4. (a) decreases 5. (b) increases (c) does not change When two pulleys…arrow_forwardQ3: (10 MARKS) A piston with a weight of 29.4 N is supported by a spring and dashpot. A dashpot of damping coefficient c = 275 N.s/m acts in parallel with the spring of stiffness k = 2400 N/m. A fluctuating pressure p = 960 sin 30t N/m² acts on the piston, whose top surface area is 0.05 m². Determine the steady-state displacement as a function of time and the maximum force transmitted to the base. P=Po sin cot Warrow_forward9. Design a spur gear drive required to transmit 45 kW at a pinion speed of 800 r.p.m. The velocity ratio is 3.5 : 1. The teeth are 20° full-depth involute with 18 teeth on the pinion. Both the pinion and gear are made of steel with a maximum safe static stress of 180 MPa. Assume a safe stress of 40 MPa for the material of the shaft and key. 10. Design a pair of spur gears with stub teeth to transmit 55 kW from a 175 mm pinion running at 2500 r.p.m. to a gear running at 1500 r.p.m. Both the gears are made of steel having B.H.N. 260. Approximate the pitch by means of Lewis equation and then adjust the dimensions to keep within the limits set by the dynamic load and wear equation.arrow_forward
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