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Machine Design

Machine Design
For tight leakage joints, following type of thread is best suited

NPT (national pipe threads).
Metric
Buttress
Square

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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

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

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Machine Design
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

Decreasing the modulus of elasticity of the bar
All of these
Decreasing the cross-sectional area of the bar
Increasing the length of bar

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Machine Design
The included angle between the sides of V-belt is

38°
40°
45°
60°

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Machine Design
The standard length of the shaft is

5 m
7 m
All of these
6 m

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Machine Design
For hardening alloy steels and high speed steels, they are heated to

500 to 600°C
700 to 900°C
1100 to 1300°C
1300 to 1500°C

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