Mechanical Engineering Machine Design - Set 12 - ObjectiveBooks

# Practice Test: Question Set - 12

1. The rolling contact bearings as compared to sliding contact bearings have
(A) Low starting and low running friction except at very high speeds
(B) Accuracy of shaft alignment
(C) Small overall dimensions
(D) All of the above

2. Three different weights fall from a certain height under vacuum. They will take
(A) Same time to reach earth
(B) Times proportional to weight to reach earth
(C) Times inversely proportional to weight to reach earth
(D) None of the above

3. The pipe joint mostly used for pipes carrying water at low pressures is
(A) Socket joint
(B) Nipple joint
(C) Union joint
(D) Spigot and socket joint

4. In cross or regular lay ropes
(A) Direction of twist of wires in strands is opposite to the direction of twist of strands
(B) Direction of twist of wires and strands are same
(C) Wires in two adjacent strands are twisted in opposite direction
(D) Wires are not twisted

5. A universal coupling is used to connect two shafts
(A) Which are not in exact alignment
(B) Which are perfectly aligned
(C) Whose axes intersect at a small angle
(D) Have lateral misalignment

6. In standard taper roller bearings, the angle of taper of outer raceway is
(A)
(B)
(C) 15°
(D) 25°

7. In composite or reverse laid ropes
(A) Direction of twist of wires in strands is opposite to the direction of twist of strands
(B) Direction of twist of wires and strands are same
(C) Wires in two adjacent strands are twisted in opposite direction
(D) Wires are not twisted

8. Whether any core is required in wire ropes
(A) Yes
(B) No
(C) Sometimes
(D) Rarely

9. The lower deviation is the algebraic difference between the
(A) Actual size and the corresponding basic size
(B) Maximum limit and the basic size
(C) Minimum limit and the basic size
(D) None of the above

10. If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to
(A) Diameter of bolt
(B) 0.75 × diameter of bolt
(C) 1.25 × diameter of bolt
(D) 1.5 × diameter of bolt

11. Basic shaft is one
(A) Whose upper deviation is zero
(B) Whose lower deviation is zero
(C) Whose lower as well as upper deviations are zero
(D) Does not exist

12. The maximum normal stress theory is used for
(A) Plastic materials
(B) Brittle materials
(C) Non-ferrous materials
(D) Ductile materials

13. The rivet head used for boiler plate riveting is usually

14. Basic hole is one
(A) Whose upper deviation is zero
(B) Whose lower deviation is zero
(C) Whose lower as well as upper deviations are zero
(D) Does not exist

15. I.S. specifies following total number of grades of tolerances
(A) 18
(B) 16
(C) 20
(D) 22

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