Objective Practice on Machine Design Engineering - Set 33 - ObjectiveBooks

# Practice Test: Question Set - 33

1. In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as
(A) Helix angle
(B) Pressure angle
(D) None of these

(A) Higher
(B) Lower
(C) Same
(D) None of these

3. The resilience of a bolt may be increased by
(A) Increasing its shank diameter
(B) Increasing its length
(C) Decreasing its shank diameter
(D) Decreasing its length

4. The velocity factor for ordinary cut gears operating at velocities up to 12.5 m/s is equal to
(A) 0.75/(0.75 + √v)
(B) 3/(3 + v)
(C) 4.5/(4.5 + v)
(D) 6/(6 + v)

5. The bearings of medium series have capacity __________ over the light series.
(A) 10 to 20%
(B) 20 to 30%
(C) 30 to 40%
(D) 40 to 50%

6. The square threads are usually found on
(A) Spindles of bench vices
(B) Railway carriage couplings
(C) Feed mechanism of machine tools
(D) Screw cutting lathes

7. Multiple threads are used to secure
(A) Low efficiency
(B) High efficiency

8. Which of the following statement is correct?
(A) The cold rolled shafting is stronger than hot rolled shafting
(B) The hot rolled shafting is stronger than cold rolled shafting
(C) The cold rolled and hot rolled shafting are equally strong
(D) The shafts are not made by rolling process

9. The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth.
(A) Increases
(B) Decreases
(C) Remain same
(D) None of these

10. The permissible stress in the fillet weld is 100 N/mm². The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on the weldment per cm length of the weld is
(A) 7.5 kN
(B) 10.6 kN
(C) 15 kN
(D) 22.5 kN

11. The smallest diameter of an external or internal screw thread is known as
(A) Minor diameter
(B) Major diameter
(C) Pitch diameter
(D) None of these

12. The shock absorbing capacity of a bolt may be increased by
(A) Increasing its shank diameter
(B) Decreasing its shank diameter
(C) Tightening the bolt properly
(D) Making the shank diameter equal to core diameter of thread

13. The piston pin bearings in heavy duty diesel engines are
(A) Needle roller bearings
(B) Tapered roller bearings
(C) Spherical roller bearings
(D) Cylindrical roller bearings

14. The tension on the slack side of the belt is __________ the tension on the tight side of the belt.
(A) Equal to
(B) Less than
(C) Greater than
(D) None of these

15. In skew bevel gearing, the axes of shafts are
(A) Intersecting and the teeth are curved
(B) Non-intersecting and nonparallel and the teeth are curved
(C) Non-intersecting and non-parallel and the teeth are straight
(D) None of the above

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