Design of Machine Elements - Set 2

1)   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  Explanation 

ANSWER: Studs

Explanation:
No explanation is available for this question!


2)   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  Explanation 

ANSWER: I.S.O. Metric fine thread

Explanation:
No explanation is available for this question!


3)   Which type of screw fasteners are threaded through out its length?

a. Cap screws
b. Set screws
c. Studs
d. Tap bolt
Answer  Explanation 

ANSWER: Set screws

Explanation:
No explanation is available for this question!


4)   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  Explanation 

ANSWER: Square butt weld

Explanation:
No explanation is available for this question!


5)   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  Explanation 

ANSWER: 12 mm

Explanation:
No explanation is available for this question!


6)   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  Explanation 

ANSWER: pn + 3d

Explanation:
No explanation is available for this question!


7)   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  Explanation 

ANSWER: 1.252

Explanation:
No explanation is available for this question!


8)   Why are mechanical springs used?

a. To apply force
b. To store energy
c. To measure force
d. All of the above
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!


9)   Which of the following statements is/are true? 1. In volute springs, number of active coils gradually decreases as load increases 2. Stiffness of spring decreases as number of coils decreases in conical springs 3. Torsion springs are generally spiral 4. Helical torsion springs are used in automobile starters

a. Statements 1 and 3
b. Statements 2, 3 and 4
c. Statements 1, 3 and 4
d. All of the above
Answer  Explanation 

ANSWER: Statements 1, 3 and 4

Explanation:
No explanation is available for this question!


10)   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  Explanation 

ANSWER: Uncompressed condition

Explanation:
No explanation is available for this question!


11)   The application factor depends on ______

a. prime mover
b. hours of operation per day
c. machine driven
d. all of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


12)   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  Explanation 

ANSWER: Both a. and b.

Explanation:
No explanation is available for this question!


13)   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  Explanation 

ANSWER: Interaction between man machine working environment

Explanation:
No explanation is available for this question!


14)   Series of numbers offered by arithmetic progression are called as preferred series

a. True
b. False
Answer  Explanation 

ANSWER: False

Explanation:
No explanation is available for this question!


15)   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  Explanation 

ANSWER: Tension link in bridge structure

Explanation:
No explanation is available for this question!


16)   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  Explanation 

ANSWER: The material obeys hooke's law

Explanation:
No explanation is available for this question!


17)   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  Explanation 

ANSWER: The bending stress distribution in bending of curved beams is hyperbolic

Explanation:
No explanation is available for this question!


18)   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  Explanation 

ANSWER: Elastic instability

Explanation:
No explanation is available for this question!


19)   A shaft transmits power of 30 kW. According to maximum principle stress theory and shear theory diameter of shaft is 70 mm and 73 mm respectively. Tensile stress acting on the shaft is 50 Mpa. What will be the shaft diameter to transmit power?

a. 65 mm
b. 70 mm
c. 73 mm
d. Insufficient data
Answer  Explanation 

ANSWER: 73 mm

Explanation:
No explanation is available for this question!


20)   Universal coupling is a type of ____

a. Flexible coupling
b. Rigid coupling
c. Both a. and b.
d. None of the above
Answer  Explanation 

ANSWER: Flexible coupling

Explanation:
No explanation is available for this question!