Design of Machine Elements solved MCQs

1 of 14

1. Stressed parts are always kept in tension.

a. true

B. false

2. Which process allows controlling grain structure of the product?

a. casting

B. forging

c. none of the mentioned

d. die casting

3. Cast surfaces have good finishing.

a. true

B. false

4. In forging, metal is in which of the following stage?

a. elastic

B. plastic

c. can be in any stage

d. rigid

5. Among casting, forging and forging which has the slowest rate of production?

a. casting

B. forging

c. machining

d. all have equal rate of production

6. In manual assembly, cost of screw is higher than the cost of driving a screw.

a. true

B. false

7. Maximum carbon content in welding is usually limited to

a. 0.22%

B. 0.8%

c. 1.5%

d. 2%

8. Why tolerances are given to the parts?

a. because it’s impossible to make perfect settings

B. to reduce weight of the component

c. to reduce cost of the assembly

d. to reduce amount of material used

9. What is bilateral tolerance?

a. total tolerance is in 1 direction only

B. total tolerance is in both the directions

c. may or may not be in one direction

d. tolerance provided all over the component body

10. What is mean clearance?

a. maximum size of hole minus maximum size of shaft

B. minimum size of hole minus minimum size of shaft

c. mean size of hole minus mean size of shaft

d. average of both size of shaft and hole

11. Which of the following is incorrect about tolerances?

a. too loose tolerance results in less cost

B. tolerance is a compromise between accuracy and ability

c. too tight tolerance may result in excessive cost

d. fit between mating components is decided by functional requirements

12. Quality control charts doesn’t depend on which factor?

a. normal distribution

B. random sampling

c. independence between samples

d. binomial distribution

13. If a clearance fit is present between shaft and hole, what is the tolerance on shaft or hole for a complete interchangeable approach?

a. ½ of maximum clearance – ½ of minimum clearance

B. ¼ of maximum clearance – ¼ of minimum clearance

c. maximum clearance – minimum clearance

d. ¾ of maximum clearance – ¾ of minimum clearance

14. A beam is said to be of uniform strength, if

a. b.m. is same throughout the beam

B. shear stress is the same through the beam

c. deflection is the same throughout the beam

d. bending stress is the same at every section along its longitudinal axis

15. Stress in a beam due to simple bending is

a. directly proportional

B. inversely proportional

c. curvilinearly related

d. none of the mentioned

16. Which stress comes when there is an eccentric load applied?

a. shear stress

B. bending stress

c. tensile stress

d. thermal stress

17. On bending of a beam, which is the layer which is neither elongated nor shortened?

a. axis of load

B. neutral axis

c. center of gravity

d. none of the mentioned

18. The bending stress is  

a. directly proportional to the distance of layer from the neutral layer

B. inversely proportional to the distance of layer from the neutral layer

c. directly proportional to the neutral layer

d. does not depend on the distance of layer from the neutral layer

19. Consider a 250mmx15mmx10mm steel bar which is free to expand is heated from 15C to 40C. what will be developed?

a. compressive stress

B. tensile stress

c. shear stress

d. no stress

20. The safe stress for a hollow steel column which carries an axial load of 2100 kN is 125 MN/m2. if the external diameter of the column is 30cm, what will be the internal diameter?

a. 25 cm

B. 26.19cm c) 30.14 cm

c. d) 27.9 cm

21. Stress intensity factor is the critical value of stress at which crack extension occurs.

a. true

B. false

22. Fracture toughness does not depend upon geometry of the part containing crack

a. true

B. false

23. How many modes are there for crack propagation?

a. 2

B. 3

c. 4

d. 5

24. A curved beam has neutral axis is curved while loaded and straight when unloaded.

a. true

B. false

25. The bending stress in a straight beam varies linearly with the distance from neural axis like that in a curved beam.

a. true

B. false

c. topic 1.4 impact and shock loading - calculation of principle stresses for various load combinations, eccentric loading - curved beams - crane hook and €ˌc€„¢ frame

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