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Machine Design

Machine Design
The spring mostly used in gramophones is

Flat spiral spring
Volute spring
Helical spring
Conical spring

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Machine Design
The maximum efficiency of a square threaded screw is

(1 - sinφ)/ (1 + cosφ)
(1 + cosφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + sinφ)
(1 + sinφ)/ (1 - sinφ)

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Machine Design
The function of the washer is to

Provide cushioning effect
Absorb shocks and vibrations
Provide bearing area
Fill up the axial gap

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

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

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

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

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Machine Design
Cast iron pipes are mainly used

For conveying steam
In water and sewage systems
In pressure lubrication systems on prime movers
All of these

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