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Problem_Solving_01

📌 We have designed a comprehensive machine design test consisting of 20 questions to assess your knowledge and understanding of various topics related to machine design. This test aims to evaluate your proficiency in areas such as mechanical components, materials selection, stress analysis, kinematics, and more. By taking this test, you can determine your level of comprehension and identify areas that may require further study. Complete this test to gauge your mastery in machine design and enhance your understanding of the subject.

Problem_Solving_01

15問 • 1年前📌 We have designed a comprehensive machine design test consisting of 20 questions to assess your knowledge and understanding of various topics related to machine design. This test aims to evaluate your proficiency in areas such as mechanical components, materials selection, stress analysis, kinematics, and more. By taking this test, you can determine your level of comprehension and identify areas that may require further study. Complete this test to gauge your mastery in machine design and enhance your understanding of the subject.

Jacky Shane Luyas Buhia

問題一覧

1

What is the working strength of a 2” bolt which is screwed up tightly in a packed jointly when the allowable working stress is 12000 psi?

B. 20,400 lbs

2

What Hp can a 1.5-inch diameter short shaft transmit at 450 rpm?

C. 40 Hp

3

A casting weighing 300 pounds is to be filled by means of an overhead crane. The casting is lifted 10 feet in 12 seconds. What is the horsepower developed?

D. 0.45

4

A 36-tooth pinion turning at 300 rpm drives 120-tooth gear of 14.5 ° involute full depth pressure angle. Determine the rpm of the driven gear.

D. 90 rpm

5

A 20° straight-tooth bevel pinion having 14 teeth and a diametral pitch of a 6 teeth/inch drives a 42-tooth gear. The two shafts are at right angles and in the same plane. Find the pitch angle of the pinion.

A. 18.4°

6

What is the polar section modulus of a solid shaft with a diameter of 101.6 mm?

C. 205.9 𝑐𝑚³

7

If two parallel shafts are connected by cylinders in pure rolling contact and turning in the same direction, and having a speed ratio of 2.75, what is the center distance of the two shafts assuming that the diameter of the smaller cylinder is 22 cm?

B. 19.25 cm

8

Two extension coil springs are hooked in series that support a single weight of 100 kg. The first spring is rated at 4 kN/m and the other spring is rated at 6 kN/m. Determine the total deflection of the springs.

A. 408.6 mm

9

A 20-tooth motor sprocket, running at 1200 rpm, drives a blower at a speed ratio of 4:1. Using the largest permissible chain size and the largest permissible center distance of 80 pitches, what length of chain in pitches is required to connect the sprockets?

B. 212 pitches

10

A 20° involute spur gear has a tooth whole depth of 16.95 mm, a tooth thickness of 13.2 mm, and a pitch of 3. Determine the circular pitch of the gear.

A. 26.6 mm

11

Determine the wire diameter of a helical spring using Bergstrasser factor if the load is 130 lb and spring index of 8 if the maximum shearing stress of 50 ksi.

A. 0.25 in.

12

Four compression coil springs in parallel support a load of 800 lbs. Each spring has a gradient of 40 lb/in. How much deflection will result?

C. 5 in.

13

A helical coil spring has a mean coil diameter of 1 inch and a wire diameter of 1/8 inch. Compute the Wahl factor of the spring.

C. 1.184

14

Determine the maximum shearing stress in a helical spring composed of 20 turns of ¾ diameter wire on a mean radius of 3'' when the spring is supporting a load of 400 pounds. Use G ═ 12 × 106 psi.

A. 17,152 psi

15

The drum is 12 inches in diameter and the band width is 4 inches. The coefficient of friction is 0.25 and the angle of wrap is 270 ̊. Find the tension on the tight side if the band brake is to have a maximum lining pressure of 90 psi.

B. 9.61 kN

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問題一覧

1

What is the working strength of a 2” bolt which is screwed up tightly in a packed jointly when the allowable working stress is 12000 psi?

B. 20,400 lbs

2

What Hp can a 1.5-inch diameter short shaft transmit at 450 rpm?

C. 40 Hp

3

A casting weighing 300 pounds is to be filled by means of an overhead crane. The casting is lifted 10 feet in 12 seconds. What is the horsepower developed?

D. 0.45

4

A 36-tooth pinion turning at 300 rpm drives 120-tooth gear of 14.5 ° involute full depth pressure angle. Determine the rpm of the driven gear.

D. 90 rpm

5

A 20° straight-tooth bevel pinion having 14 teeth and a diametral pitch of a 6 teeth/inch drives a 42-tooth gear. The two shafts are at right angles and in the same plane. Find the pitch angle of the pinion.

A. 18.4°

6

What is the polar section modulus of a solid shaft with a diameter of 101.6 mm?

C. 205.9 𝑐𝑚³

7

If two parallel shafts are connected by cylinders in pure rolling contact and turning in the same direction, and having a speed ratio of 2.75, what is the center distance of the two shafts assuming that the diameter of the smaller cylinder is 22 cm?

B. 19.25 cm

8

Two extension coil springs are hooked in series that support a single weight of 100 kg. The first spring is rated at 4 kN/m and the other spring is rated at 6 kN/m. Determine the total deflection of the springs.

A. 408.6 mm

9

A 20-tooth motor sprocket, running at 1200 rpm, drives a blower at a speed ratio of 4:1. Using the largest permissible chain size and the largest permissible center distance of 80 pitches, what length of chain in pitches is required to connect the sprockets?

B. 212 pitches

10

A 20° involute spur gear has a tooth whole depth of 16.95 mm, a tooth thickness of 13.2 mm, and a pitch of 3. Determine the circular pitch of the gear.

A. 26.6 mm

11

Determine the wire diameter of a helical spring using Bergstrasser factor if the load is 130 lb and spring index of 8 if the maximum shearing stress of 50 ksi.

A. 0.25 in.

12

Four compression coil springs in parallel support a load of 800 lbs. Each spring has a gradient of 40 lb/in. How much deflection will result?

C. 5 in.

13

A helical coil spring has a mean coil diameter of 1 inch and a wire diameter of 1/8 inch. Compute the Wahl factor of the spring.

C. 1.184

14

Determine the maximum shearing stress in a helical spring composed of 20 turns of ¾ diameter wire on a mean radius of 3'' when the spring is supporting a load of 400 pounds. Use G ═ 12 × 106 psi.

A. 17,152 psi

15

The drum is 12 inches in diameter and the band width is 4 inches. The coefficient of friction is 0.25 and the angle of wrap is 270 ̊. Find the tension on the tight side if the band brake is to have a maximum lining pressure of 90 psi.

B. 9.61 kN