Machine Design Objective Questions with Answers - Set 05 - ObjectiveBooks

Practice Test: Question Set - 05

1. In most machine members, the damping capacity of the material should be
(A) Low
(B) Zero
(C) High
(D) Could be anything

2. For unequal width of butt straps, the thicknesses of butt straps are
(A) 0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside
(B) 0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
(C) 0.75 t for both the straps on the inside and outside
(D) 0.625 t for both the straps on the inside and outside

3. The ratio of endurance limit in shear to the endurance limit in flexure is
(A) 0.33
(B) 0.4
(C) 0.5
(D) 0.55

4. The backlash for spur gears depends upon
(A) Module
(B) Tooth profile
(C) Both module and pitch line velocity
(D) Pitch line velocity

5. A transmission shaft includes
(B) Counter shaft
(C) Line shaft
(D) All of these

6. The groove angle of pulleys for V-belt is
(A) 340 to 360
(B) 420 to 450
(C) More than 400
(D) 300 to 320

7. In unilateral system of tolerance, the tolerance is allowed on
(A) Both sides of the actual size
(B) One side of the actual size
(C) One side of the nominal size
(D) Both sides of the nominal size

8. In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)
(A) d
(B) 1.5 d
(C) 2.5 d
(D) 2 d

9. For steel, the ultimate strength in shear as compared to ultimate strength in tension is
(A) 1/2
(B) 1/3
(C) 1/4
(D) 2/3

10. The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of
(A) 0.45
(B) 0.55
(C) 0.65
(D) 0.75

11. A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called
(A) Ring nut
(B) Castle nut
(C) Sawn nut
(D) Jam nut

12. A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as
(A) Angular bevel gears
(B) Mitre gears
(C) Crown Bevel gears
(D) Internal bevel gears

13. At low temperatures (say 75°C) the notched bar impact value of steel
(A) Increases markedly
(B) Decreases markedly
(C) Remain same
(D) Depends on heat treatment carried out

14. The taper on cotter varies from
(A) 1 in 24 to 1 in 20
(B) 1 in 15 to 1 in 10
(C) 1 in 32 to 1 in 24
(D) 1 in 48 to 1 in 24

15. A bolt
(A) Has a head on one end and a nut fitted to the other
(B) Has head at one end and other end fits into a tapped hole in the other part to be joined
(C) Has both the ends threaded
(D) Is provided with pointed threads

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