Machine Design Expected Mcq Part 1

Machine Design Expected Mcq 

01. The working of metals above the recrystallisation temperature is known as

A. hot working.

EXP: -  recrystallisation temperature for steels is typically between 400 and 700 °C.

02. The washer is generally specified by its

A. hole diameter

03. The taper on key is given on

A.top side only

04. The bending moment M and a torque T is applied on a solid circular shaft. If the maximum bending stress equals to maximum shear stress developed, then M is equal to

A.T/2

05. For longitudinal joint in boilers, the type of joint used is

A.butt joint with double cover plate

06. A cotter joint is used to transmit

A.axial tensile or compressive loads

07.The efficiency of a self locking screw can not be more than

A.  50%

08.The efficiency of Acme (trapezoidal) thread is less than that of a

A. square thread

09. A flange coupling is used to connect two shafts

A.which are perfectly aligned

  

10. The algebraic difference between the maximum limit and the basic size is called

A.upper deviation

11. The cold rolled shafting is stronger than

A. hot rolled shafting

12. The most important dimension in the design of a nut is

  

A.height

  

13. Factor of safety for fatigue loading is the ratio of

A.endurance limit to the working stress

14. When percentage of carbon in steel is increased, the

A. ductility of steel decreases.

15. The shock absorbing capacity of a bolt may be increased by

A. decreasing its shank diameter

  

16. A lap joint is always in

A. single shear.

17. The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using

A. Good man relation

18. In the levers of third type, the mechanical advantage is less than

A.one.

19. The edges of the boiler plates are beveled to an angle

 of 

A.80°

20. The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called

A.fluctuating stress

  

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