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Machine Design

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

4
2
6
8

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Machine Design
The material generally used for aircraft components is

Aluminium
High speed steel
Stainless steel
Mild steel

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Machine Design
Multiple threads are used to secure

High efficiency
High load lifting capacity
Low efficiency
High mechanical advantage

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Machine Design
Which of the following is an anti-friction bearing?

Pedestal bearing
Collar bearing
Needle bearing
Journal bearing

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Machine Design
If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to

(T₁ + T₂ + Tc)/2
T₁ + T₂ + Tc
T₁ - T₂ + Tc
(T₁ - T₂ + Tc)/2

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Machine Design
At low temperatures (say 75°C) the notched bar impact value of steel

Remain same
Depends on heat treatment carried out
Increases markedly
Decreases markedly

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