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Machine Design

Machine Design
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

d/4
d/8
d/2
d/6

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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 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
εc² + εl
εc + εl²
εc + 2εl

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Machine Design
According to I.B.R., the thickness of the boiler shell should not be less than

7 mm
5 mm
4 mm
6 mm

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Machine Design
The algebraic difference between the maximum limit and the basic size is called

Actual deviation
Upper deviation
Mean deviation
Lower deviation

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Machine Design
Gears are casted by

Permanent mould casting
Centrifugal casting
Slush casting
Sand mould casting

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