Machine Design MCQ Online Quiz - Set 01 - ObjectiveBooks

Machine Design MCQ Online Quiz - Set 01

Quiz Questions

01. When a load W is suddenly applied to a bar of weight W₁, the stress induced in the bar will increase with the increase in weight W₁.

02. Screws jacks have multiple threads.

03. According to law of gearing, the common normal at the point of contact between a pair of teeth must always pass through the pitch point.

04. The major diameter of a screw thread is also known as core or root diameter.

05. The radial stress across the thickness of a thick cylinder is maximum at the inner surface and zero at the outer surface.

06. The diameter of washer is generally taken bigger than the nut size.

07. Oldham coupling is used to transmit power between two parallel shafts which are slightly offset.

08. In a bolt, the plane of shear should be across the threaded portion of the shank.

09. The load placed at the top of the screw in a mechanical screw jack is prevented from rotation by providing a swivelling mechanism.

10. Two concentric helical springs used to provide greater spring force are wound is opposite direction.

11. A quarter turn belt drive is used when the shafts are arranged at right angles and rotate in one definite direction.

12. When the frictional force helps to apply the brake, then the brake is said to be self-energizing brake.

13. The ratio of number of teeth to the pitch circle diameter in millimetres is called circular pitch.

14. The springs mostly used in machinery have spring index less than 3.

15. A plate with a circular hole in the centre is subjected to a pull of P. The maximum stress induced at the edge of the hole is three times of the nominal stress.

16. When percentage of carbon in steel is increased, the ductility of steel decreases.

17. In a belt drive, the velocity ratio is the inverse ratio of the diameters of driving and driven pulleys.

18. When the top of a tooth undercuts the root on the mating gear, it is known as interference.

19. The buttress threads have low frictional resistance characteristic of the square threads and have the same strength of V-threads.

20. A bushed pin flexible coupling is used to connect two shafts whose axes intersect at a small angle.

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