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Machine Design

Machine Design
The included angle for the British Association thread is

60°
55°
47.3°
29°

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Machine Design
When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

16F/ 3πd²
6F/ πd²
8F/ πd²
4F/ πd²

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Machine Design
When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)

π/4 × d².τu
t.τu
πd.t.τu
π/4 × d² × tτu

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Machine Design
The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction)

45° - φ/2
90° - φ
45° + φ/2
45° - φ

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Machine Design
For crank shaft bearings, the ratio of the length of the journal to its diameter is_________.

None of these
Less than unity
Equal to 1
Greater than unity

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

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

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