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Machine Design

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

Elliptical
Any one of these
Rectangular
I-section

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Machine Design
According to maximum normal stress theory, the maximum normal stress in the shaft is

√(σ² × 4τ²)
σ + √(σ² × 4τ²)
(1/2) × √(σ² × 4τ²)
(1/2) × [σ + √(σ² × 4τ²)]

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Machine Design
The value of Lewis form factor used in design of gears is

Dependent on system of teeth
Dependent on number of teeth of a gear
All of these
Independent of size of teeth

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Machine Design
The cam follower generally used in automobile engines is

Roller follower
Spherical faced follower
Knife edge follower
Flat faced follower

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Machine Design
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

45 to 60%
63 to 70%
70 to 83%
80 to 90%

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Machine Design
A saddle key __________ power through frictional resistance only.

None of these
Either A or B
Transmits
Does not transmit

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