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Machine Design

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

6
8
4
2

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Machine Design
In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be

0.97
0.99
0.98
0.96

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Machine Design
The efficiency of a riveted joint is equal to

Pt /P
Pc /P
Least of Pt, Ps and Pc/P
Ps /P

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Machine Design
The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of

0.45
0.55
0.75
0.65

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Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (neglecting centrifugal tension) will be equal to (Where, Pc is centrifugal tension)

P1 - P2
⅟₂ × (P1 + P2)
[⅟₂ × (P1 + P2)] + Pc
P1 + P2

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Machine Design
When the belt is transmitting maximum power, the belt speed should be(Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))

√(3m /Pmax)
√(Pmax / m)
√(Pmax / 3m)
√(Pmax / 2m)

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