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

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Questions
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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