Machine Design Mechanical Engineering Questions and Answers - Set 29 - ObjectiveBooks

# Practice Test: Question Set - 29

1. In cylindrical cams, the follower moves
(A) In a direction perpendicular to the cam axis
(B) In a direction parallel to the cam axis
(C) In any direction irrespective of cam axis
(D) Along the cam axis

2. For general industrial machinery, the ratio of the length of journal to its diameter is taken as
(A) 0.5 to 1
(B) 1 to 2
(C) 3 to 5
(D) 5 to 10

3. In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.
(A) Larger than
(B) Smaller than
(C) Equal to
(D) None of these

4. Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?
(A) Woodruff key
(B) Feather key
(D) Tangent key

5. The washer is generally specified by its
(A) Outer diameter
(B) Hole diameter
(C) Thickness
(D) Mean diameter

6. According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than
(A) d
(B) 1.5 d
(C) 2 d
(D) 2.5 d

7. The product of the diametral pitch and circular pitch is equal to
(A) 1
(B) 1/Ï€
(C) Ï€
(D) Ï€ × number of teeth

8. In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.
(A) Equal to
(B) Twice
(C) Three times
(D) Four times

9. In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing.
(A) Thick film
(B) Thin film
(C) Either A or B
(D) None of these

10. Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and Ïƒt = Permissible tensile stress for plate material)
(A) p.d.Ïƒt
(B) p.t.Ïƒt
(C) (p - d) Ïƒt
(D) (p - d) t.Ïƒt

11. According to Indian standards, total numbers of tolerance grades are
(A) 8
(B) 12
(C) 18
(D) 20

12. The ball bearings are, usually, made from
(A) Low carbon steel
(B) High carbon steel
(C) Medium carbon steel
(D) High speed steel

13. A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where Ïƒ = Stress for a plate with no hole i.e. nominal stress)
(A) Ïƒ [1 + (b/2a)]
(B) Ïƒ [1 + (2a/b)]
(C) Ïƒ [1 + (b/3a)]
(D) Ïƒ [1 + (3a/b)]

14. In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.
(A) Right hand
(B) Left hand
(C) Both A and B
(D) None of these

15. Which of the following statement is correct?
(A) A parallel sunk key is a taperless key
(B) A parallel sunk key may be rectangular or square in cross-section
(C) A flat saddle key is a taper key which fits in a key way of the hub and is flat on the shaft
(D) All of the above

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