Machine Design Part 2

Attempt Free Machine Design Part 2 Here. Read The Important Mechanical MCQ From Below.

Q1. The fatigue life of a part can be improved by
A. electroplating
B. polishing
C. coating
D. shot peening
E. heat treating.

Answer : D

Q2. When two helical springs of equal lengths are arranged to form a cluster spring, then.
A. shear stress in each spring will be equal
B. load taken by each spring will be half the total load
C. all of the above
D. none of these

Answer : C

Machine Design Part 2

Q3. When the speed of belt increases,
A. the coefficient of friction between the belt and pulley increases
B. the coefficient of friction between the belt and pulley decreases
C. the power transmitted will decrease
D. the power transmitted will increase

Answer : C

Q4. Stress concentration in static loading is more serious in
A. ductile materials
B. brittle materials
C. equally serious in both cases
D. depends on other factors
E. unpredictable.

Answer : B

Machine Design Part 2

Q5. The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that.
A. it is subjected to a higher stress than the outer side
B. it is subjected to a higher cyclic loading than the outer side
C. it is more stretched than the outer side during the manufacturing process
D. it has a lower curvature than the outer side

Answer : B

Q6. A wood-ruff key is.
A. a tapered key with head at one end
B. fitted in pairs at right angles
C. capable of tilting in a recess milled out in the shaft
D. all of the above

Answer : C

Machine Design Part 2

Q7. Stress concentration in cyclic loading is more serious in
A. ductile materials
B. brittle materials
C. equally serious in both cases
D. depends on other factors
E. unpredictable.

Answer : A

Q8. The property of a material which enables it to be drawn into wires with the application of a tensile force, is called.
A. plasticity
B. elasticity
C. ductility
D. malleability

Answer : C

Machine Design Part 2

Q9. In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that.
A. the effect of curvature of the cylinder wall is neglected
B. the tensile stresses are uniformly distributed over the section of the walls
C. the effect of the restraining action of the heads at the end of the pressure vessel is neglected
D. all of the above

Answer : D

Q10. Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to
A. dynamic loading
B. static loading
C. combined static and dynamic loading
D. completely reversed loading
E. all of the above.

Answer : D

Machine Design Part 2

Q11. Lewis equation in gears is used to find the.
A. tensile stress in bending
B. shear stress
C. compressive stress in bending
D. fatigue stress

Answer : C

Q12. According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by.
A. 0.5 mm upto rivet diameter of 24 mm
B. 1 mm for rivet diameter from 27 mm to 36 mm
C. 2 mm for rivet diameter from 39 mm to 48 mm
D. all of the above

Answer : C

Q13. Pick up wrong statement. Fatigue strength can be increased by
A. cold working
B. shot peening
C. grinding and lapping surface
D. hot working
E. using gradual changes of section.

Answer : D

Machine Design Part 2

Q14. A shaft is designed on the basis of rigidity and stiffness.
A. Correct
B. Incorrect
C. Both (a) and (b)
D. None of these

Answer : A

Q15. A connecting rod should be.
A. strong in buckling about X-axis
B. strong in buckling about Y-axis
C. equally strong in buckling about X-axis and Y-axis
D. any one of the above

Answer : C