WorksheetsPart 3- mdsp
Total questions: 18
Worksheet time: 9mins
A high alloy spring having squared and ground ends has a total of 16 coils and modulus of elasticity in shear of 85 GPa. Compute the Wahl factor. The spring outside diameter is 9.66 cm and wire diameter is 0.65 cm.
1.058
1.185
1.10*
1.2
A local utility vehicle production company has considered using one of its designs: a multi-disc clutch consisting of 9 steel discs and 8 bronze discs, with effective outside and inside diameter of 220 mm and 160 mm, respectively. If the shaft turns at 1500 rpm and an axial force of 500 Newton is applied, find the horsepower capacity considering a coefficient of friction of 0.25. Use uniform pressure method.
40.34 hp*
48.41 hp
43.40 hp
41.48 hp
A 1.25 in. shaft uses sleeve bearings. The total load per bearing is 400 lb. An L/D ratio of 2.5 is desired. What is the bearing pressure?
284.44 psi
288.88 psi
120.4 psi
102.4 psi*
A sleeve bearing with diameter of 1.5 in. and a length of 2 in, has a wall thickness is 3/16 in. The bearing is subjected to a radial load of 350 lb. Find the bearing pressure.
200 psi
15O psi*
156 psi
250 psi
What is the surface velocity of a pulley 18 inches in diameter mounted on a shaft running at 300 rpm?
1414 fpm*
1144 fpm
1178 fpm
1187 fpm
What should be the diameter of pulley in inches with a belt speed of 4500 fpm and the motor running at 1800 rpm?
9.76 in
9.67 in
9.55 in*
9.45 in
A simply supported beam, 10 m long carries a uniform distributed load of 20 kN/m. What is the value of the maximum moment of the beam due to the load?
10,000 kN-m
2,000 kN-m
5,000 kN-m
250 kN-m*
A steel string 10 m long hanging vertically supports a tensile load of 1000 N. Neglecting the weight of the wire, determine the required diameter if the total elongation is not to exceed 2.5 mm. (Assume: E = 200 Gpa).
6.04 mm
5.05 mm*
5.50 mm
3.37 mm
If the ultimate shear strength of a steel plates is 42 000 psi, what force is necessary to punch a 0.75 inch diameter hole in 0.625 inch thick plate?
61 850 lb*
65 810 lb
61 580 lb
60 185 lb
A flange coupling is to transmit 15,000 in-lb between two 2.5" diameter shafts. How many % diameter bolts in a 6º diameter bolt circle are required if the shear stress in each bolt is limited to 3000 psi?
9*
7
6
8
A line shaft is to transmit 200 Hp at 900 rpm. Find the diameter of the shaft.
2.18
2.28*
3.18
3.28
A round steel shaft rotates at 200 rpm and is subjected to a torque of 275 N-m and a bending moment of 415 N-m. Determine the equivalent twisting moment.
597.84 N-m
456.42 N-m*
546.43 N-m
497.85 N-m
Compute the safe wall thickness of a 76.2 cm diameter steel tank. The tank is subjected to 7.33 Mpa pressure and the steel material has yield stress of 215.4 Mpa. The factor of safety to use is 3.
1-1/2 IN
4.09 cm
3.89 cm *
3.96 cm
A solid steel shaft 5 m long with a diameter of 0.104 m is stressed to 60 Mpa when twisted through 40. Using G = 83 Gpa. What power can be transmitted by the shaft at 20 rad/sec?
2.34 MW
1.66 MW*
3.21 MW
2.98 MW
A steel railroad rails 10 m long are laid with clearance of 3. mm at a temperature of 15°C. At what temperature will the rails just touch? If there were no initial clearance assume: alpha = 11.7 micro m/m deg. C and E= 200 Gpa.
40.64°C
23,45°C
34.56°C
45.43°C
A compression ring is to be used at the junction of a conical head and shell. Determine the required area of the compression ring if the pressure is 50 psi and the stress is 13,750 psi. Assume efficiency of the joint is 80%.
0.00815 d²
0.00715 d²*
0.00915 d²
0.00615 d²
A flanged bolt coupling has ten (10) steel 25.4 mm diameter bolts evenly tighten around a 415 mm bolt circle. Determine the torque capacity the connection if the allowable shearing stress in the bolt is 50 MN/m2.
59.95 kN-m
46.15 kN-m
52.60 kN-m*
43.80 kN-m
Determine the maximum shearing stress in a helical steel spring composed of 20 turns of 20 mm diameter wire on mean radius of 80 mm when the spring is supporting a load of 2 kN?
131 Mpa
150 Mpa
130 Mpa
121 Mpa*
