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Machine Design

Machine Design
According to Indian standards, total numbers of tolerance grades are

8
20
12
18

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

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

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

8W/9
W/9
2W/3
W/2

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Machine Design
The dedendum circle diameter is equal to (where φ = Pressure angle)

Pitch circle diameter × cosφ
Addendum circle diameter × cosφ
Clearance circle diameter × cosφ
Pitch circle diameter × sinφ

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Machine Design
The railway carriage couplings have

Acme threads
Buttress threads
Square threads
Knuckle threads

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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
d
0.5 d
1.25 d

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