600 Important Machine Design MCQ Question and Answer | PDF Free Download
1.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
- Ad
- B1.5 d
- C2 d
- D2.5 d
2.According to I.B.R., the factor of safety of riveted joint should not be less than
- A1
- B2
- C3
- D4
3.According to I.B.R., the thickness of the boiler shell should not be less than
- A4 mm
- B5 mm
- C6 mm
- D7 mm
4.The number of slots in a 25 mm castle nut is
- A8
- B6
- C4
- D2
5.Stress concentration is caused due to
- AVariation in properties of material from point to point in a member
- BPitting at points or areas at which loads on a member are applied
- CAbrupt change of section
- DAll of the above
6.For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately
- A0.4 times
- B0.6 times
- C0.7 times
- D0.8 times
7.In the levers of first type, the mechanical advantage is ________ one.
- ALess than
- BEqual to
- CMore than
- DNone of these
8.Wahl's stress factor __________ very rapidly as the spring index decreases.
- AIncreases
- BDecreases
- CRemain same
- DNone of these
9.Wahl's stress factor __________ very rapidly as the spring index decreases.
- AIncreases
- BDecreases
- CRemain same
- DNone of these
10.In Vickers hardness testing, the pyramid indentor apex is
- A40°
- B122°
- C136°
- D152°
11.For longitudinal joint in boilers, the type of joint used is
- AButt joint with single cover plate
- BButt joint with double cover plate
- CLap joint with one ring overlapping the other
- DAny one of the above
12.The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)
- AGd⁴/ 8D3n
- BGd3/ 8D3n
- CGd⁴/ 4D3n
- DGd⁴/ 8D²n
13.The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth.
- AIncreases
- BDecreases
- CRemain same
- DNone of these
14.Lewis form factor for 14½° composite and full depth involute system is (where T = Number of teeth)
- A0.124 - (0.684/T)
- B0.154 - (0.912/T)
- C0.175 - (0.841/T)
- DNone of these
15.In block brakes, the ratio of shoe width to wheel diameter is taken between
- A0.1 and 0.25
- B0.25 and 0.50
- C0.50 and 0.75
- D0.75 and 1
16.When the fulcrum is in between the load and effort, the lever is said to be of
- AFirst type
- BSecond type
- CThird type
- DAny one of these
17.The sleeve or muff coupling is designed as a
- ADun cylinder
- BHollow shaft
- CSolid shaft
- DThick cylinder
18.A connecting rod is designed as a
- ALong column
- BShort column
- CStrut
- DAll of these
19.According to Indian standards, a bolt thread of 6 mm size of coarse pitch and with allowance on the threads and normal tolerance grade is designated as
- AM6
- BM8
- CM6 - 8d
- DM8 - 6d
20.When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring i
- ABending stress only
- BA combination of torsional shear stress and bending
- CDirect shear stress only
- DA combination of bending stress and direct shear stres