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22問 • 1年前

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. A steel tie rod on bridge must be made to withstand a pull of 22 KN. If the diameter of the rod is 18 mm, and ultimate stress of 450 MPa. What factor of safety should be used?

B. 3

5. An interrupted quenching process resulting in an austenite to martensite transition is

B. Martempering

5. What is most nearly the Poisson's ratio of a material with 25.55 GPa and a shear modulus of 10 GPa?

B: 0.28

7. If there are 860 people occupying the building other than the first floor, then how many elevators are required?

C. 4

13. Normal stress d 30 MPa, dy 40 MPa, and shear stress of 25 MPa are depicted using Mohr's circle. What will be radius of the circle?

D. 25.49

5. A 150-ton hydraulic jack has an 8-in diameter piston and a cylinder wall thickness of 0.20 inch. Find the approximate permissible working stress if the cylinder is fabricated from high-strength steel.

C. 60 ksi

18. A pair of wheels of a trolley carries a load of 67 IN on each axle. The load is acting at a point 127 mm outside of a wheel base. The distance between the wheels is 1.4 m. Calculate the diameter of the axle if the stress limit is 69 MPa.

A. 14.4 cm

20. Calculate the length of a steel bar able to resist the impact of 500 lb weight dropped through a distance of 4 inches and deflects 0.00733 in. Assume the design stress of 22,000 psi.

D. 20

21. If a driving pulley is 0.75 ft. in diameter and drives a 12-in diameter pulley, find the speed (no slip condition) of the driven pulley if the driver rotates at 200 грm.

A. 104 rpm

22. A 40-tooth steel gear has diametral pitch of 2. The pressure angle is 14 ½ degrees. Find the circular pitch

C. 1.571

Which type of gears are used for shaft axes having an offset

A. Hypoid gear

24 . Normal stress o, 35 MPa, dy 40 MPa, and unknown value of shearing stress are depicted using Mohr's circle. If the radius of the circle is 30 MPa, what is the shear stress?

B. 30

25. A'semi-elliptical leaf spring has load of 60 lbs acting at its center, a distance F of 8 inches, the leaf thickness is 1/8 in. and the width of the leaf is in. If the sin modulus of elasticity is 30 x 10 (raised to 6) psi, what is the induced stress?

A. 122, 860 psi

25.A th thin cylindrical tube closed at ends and subjected to interna also applied to the tube. The principal stresses developed are 80 units and 20 units respectively. If the yield stress is 240 unit then what is the factor of safety according to maximun shear stress theory?

D. 4

27. A grey cast iron plate is 600 mm x 600 mm in size. It is to be finished on a shaper by two rough cuts and one finish cut. Cutting speed of the tool is 10 m/min, return/cutting time ratio is 2:3, and feed is 1.2 mm/cycle. If the lengthwise allowance is 20 mm and widthwise allowance is 5 mm, calculate the length of stroke.

B. 33 in

29. An inclined plane 5 long has its upper and is pushed up the plane against a force of friction of EN. What is the actual upper end 1 meter above the ground. A load of 100 nechanical advantage?

C. 5

31. In a multiple disc clutch, the number of disc on the driving shaft is 4, and the number of plates on the driven shaft is 5, what is the number of pairs of contacting surfaces?

B.8

B. 33 in

29. An inclined plane 5 long has its upper and 1 meter above the ground.A load of 100 N is pushed up the plane against a force of friction of 5 N. What is the actual. mechanical advantage?

C. 5

30. Hand sheers can be used for cutting sheets up to

D. 1.6 mm

31. In a multiple disc clutch, the number of disc on the driving shaft is 4, and the number of plates on the driven shaft is 5, what is the number of pairs of contacting surfaces?

B. 8

37 A A. Tempering 2. Martempering C. Austenitizing D. Austempering steel bar 24-in in length is to withstand a tensile impact load caused by a of 100 1b having a weight velocity on impact of 140 fpm. Find the stress in the bar if the diameter is 1 in and the Young's Modulus is 30,000,000 psi.

B. 12,000 pai

THERMO

James Paul Concepcion · 31問 · 1年前

THERMO