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Machine Design

Machine Design
The cross-section of the arm of a bell crank lever is

Rectangular
I-section
Elliptical
Any one of these

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Machine Design
When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)

0.75 d
0.5 d
d
1.25 d

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Machine Design
The longitudinal joint in boilers is used to get the required

Diameter of boiler
Length and diameter of boiler
Efficiency of boiler
Length of boiler

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Machine Design
The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

24
12
14
18

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Machine Design
Stress concentration in cyclic loading is more serious in

Ductile materials
Brittle materials
Equally serious in both cases
Depends on other factors

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Machine Design
The helix angle for single helical gears ranges from

15° to 20°
10° to 15°
20° to 35°
35° to 50°

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