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Machine Design

Machine Design
In worm gears, the pressure angle is __________ the angle between two inclined faces in axial plane.

Twice
Thrice
None of these
Half

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

2.5
2.8
3.5
3

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Machine Design
The efficiency of a riveted joint is equal to

Pt /P
Least of Pt, Ps and Pc/P
Pc /P
Ps /P

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Machine Design
Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

(k₁ - k₂)/ (k₁ + k₂)
(k₁ k₂)/ (k₁ + k₂)
(k₁ - k₂)/ (k₁ k₂)
(k₁ + k₂)/ (k₁ k₂)

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Machine Design
The constant factor in case of R10 series of preferred numbers is

1.12
1.26
1.58
1.06

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Machine Design
For circumferential joint in boilers, the type of joint used is

Butt joint with single cover plate
Any one of the above
Butt joint with double cover plate
Lap joint with one ring overlapping the other

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