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Machine Design

Machine Design
Which one of the following is a positive drive?

Rope drive
V-belt drive
Crossed flat belt drive
Chain drive

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Machine Design
Lewis equation in gears is used to find the

Tensile stress in bending
Compressive stress in bending
Fatigue stress
Shear stress

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Machine Design
The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be

2εc + εl
εc + 2εl
εc + εl²
εc² + εl

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Machine Design
The number of slots in a 25 mm castle nut is

6
2
8
4

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Machine Design
Which is positive drive?

V belt drive
Crossed belt drive
Timing belt
Flat belt drive

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Machine Design
A self locking screw has

Coefficient of friction is greater than tangent of load angle
Course threads
Hole for inserting split pin
Fine threads

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