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Machine Design

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

6
2
8
4

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Machine Design
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

Increases
Decreases
None of these
Remains unchanged

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Machine Design
In order to permit the thermal expansion/contraction of tubing, it should be

Crimped
Bent
Flared
Honed

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Machine Design
The connecting rod bolts are tightened up so that tightening stress

Is 50% of yield point
Approaches yield point
Is just sufficient to hold parts together
Is about yield point divided by safety factor

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Machine Design
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

45 to 60%
70 to 83%
63 to 70%
80 to 90%

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Machine Design
In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.

None of these
Left hand
Both A and B
Right hand

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