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Design of Machine Elements Quiz | Design of Machine Elements Short Questions and Answers

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41 A single start square threaded power screw supports load of 30 kN which has outer diameter of 30 mm and a pitch of 8 mm. Maximum shear stress of 30 N/mm2 is induced in a screw body. Determine number of screw threads considering direct shear stress.
[A] 3 threads
[B] 2 threads
[C] 4 threads
[D] None of the above
Answer: 3 threads
42 Which of the following threads have greater pitch and lead angle for a given nominal diameter when compared with each other?
[A] Coarse threads
[B] Fine threads
[C] Both a. and b.
[D] None of the above
Answer: Coarse threads

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43 Which type of screw fasteners are threaded at both the ends?
[A] Through bolt
[B] Tap bolt
[C] Studs
[D] All of the above
Answer: Studs
44 What does the designation M 16 x 2 indicate?
[A] I.S.O. Metric fine thread
[B] I.S.O. Metric coarse thread
[C] B.S.F. Metric coarse thread
[D] B.S.F Metric fine thread
Answer: I.S.O. Metric fine thread
45 Which type of screw fasteners are threaded through out its length?
[A] Cap screws
[B] Set screws
[C] Studs
[D] Tap bolt
Answer: Set screws
46 Which type of joint is used if plate thickness is less than 5 mm?
[A] Single V butt weld
[B] Single U butt weld
[C] Square butt weld
[D] Double U butt weld
Answer: Square butt weld
47 Calculate weld size if weld throat thickness for the fillet weld is 8.2 mm
[A] 10 mm
[B] 14.20 mm
[C] 16.4 mm
[D] 12 mm
Answer: 12 mm
48 Free length for helical compression springs having square ends is given as ________.
[A] pn + 2d
[B] pn + 3d
[C] 2(p + d)
[D] pn + 4d
Answer: pn + 3d
49 What is the Wahl's factor if spring index is 6?
[A] 1.477
[B] 0.995
[C] 1.252
[D] None of the above
Answer: 1.252
50 Why are mechanical springs used?
[A] To apply force
[B] To store energy
[C] To measure force
[D] All of the above
Answer: All of the above
51 In which condition the axial distance between two adjacent coils is called as pitch?
[A] Compressed condition
[B] Uncompressed condition
[C] Both a. and b.
[D] None of the above
Answer: Uncompressed condition
52 The application factor depends on ______
[A] prime mover
[B] hours of operation per day
[C] machine driven
[D] all of the above
Answer: all of the above
53 What is meant by application factor?
[A] Ratio of maximum torque and average torque
[B] Ratio of maximum load and average load
[C] Both a. and b.
[D] None of the above
Answer: Both a. and b.
54 What is meant by Aesthetics?
[A] Interaction between man machine working environment
[B] Appearance of the product
[C] Both a. and b.
[D] None of the above
Answer: Interaction between man machine working environment
55 Which among the following is a knuckle joint?
[A] Tension link in bridge structure
[B] Foundation bolt
[C] Both a. and b.
[D] None of the above
Answer: Tension link in bridge structure
56 What are assumptions made during stress analysis of curved beams?
[A] The material is nonisotropic
[B] The material is non homogeneous
[C] The material obeys hooke's law
[D] All of the above
Answer: The material obeys hooke's law
57 Which of the following statements is/are true?
[A] The bending stress distribution in bending of straight beams is nonlinear
[B] The bending stress distribution in bending of curved beams is hyperbolic
[C] The neutral axis coincides with geometrical axis during bending of curved beams
[D] All of the above
Answer: The bending stress distribution in bending of curved beams is hyperbolic
58 Which factors are responsible for the failure of a component due to buckling?
[A] Yielding
[B] Plastic deformation
[C] Elastic instability
[D] All of the above
Answer: Elastic instability
59 The formula (π2 E A) / ( Le / K)2 is devised to determine buckling load by where E = modulus of elasticity, Le = equivalent length, K = radius of gyration
[A] Rankine
[B] Euler
[C] J. B. Johnson
[D] None of the above
Answer: Euler
60 Match the following Group 1 items (Preferred series) and Group 2 items ( Step ratios) and select the correct option

1. R5 ------------------------------------------------ A. 1.12

2. R20 ----------------------------------------------- B. 1.26

3. R80 ----------------------------------------------- C. 1.58

4. R10 ----------------------------------------------- D. 1.03

[A] 1 – D, 2 – C, 3 – A, 4 – B
[B] 1 – B, 2 – D, 3 – C, 4 – A
[C] 1 – A, 2 – C, 3 – D, 4 – B
[D] 1 – C, 2 – A, 3 – D, 4 – B
Answer: 1 – C, 2 – A, 3 – D, 4 – B

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