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Machine Design

Machine Design
The size of a gear is usually specified by

Diametral pitch
Pitch circle diameter
Pressure angle
Circular pitch

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Machine Design
The rolling contact bearings as compared to sliding contact bearings have

Small overall dimensions
All of these
Low starting and low running friction except at very high speeds
Accuracy of shaft alignment

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Machine Design
According to Indian standard specifications, plain carbon steel designated by 40C8 contains carbon

0.40 to 0.60%
None of these
0.35 to 0.45%
0.20 to 0.40%

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

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

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Machine Design
18/8 steel contains

18% chromium and 8% nickel
18% nickel and 8% chromium
18% nickel and 8% vanadium
18% vanadium and 8% nickel

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Machine Design
The root angle of a bevel gear is equal to

Pitch angle - addendum angle
Pitch angle + addendum angle
Pitch angle - dedendum angle
Pitch angle + dedendum angle

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