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Machine Design

Machine Design
The groove angle of pulleys for V-belt is

More than 400
340 to 360
300 to 320
420 to 450

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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
The velocity factor for precision metallic gears cut with high accuracy and operating at velocities up to 20 m/s is equal to

4.5/ (4.5 + v)
6/ (6 + v)
3/ (3 + v)
0.75/ (0.75 + √v)

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Machine Design
Two rigid plates are clamped by means of bolt and nut with an initial force F. After tightening, a separating force P (P < F) is applied to the lower plate, which in turn acts on the nut. The tension in the both after this is

F
P
F + P
F.P

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Machine Design
Which of the following material has the maximum ductility?

Mild steel
Zinc
Aluminium
Copper

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Machine Design
In V-belt drive, belt touches

At sides only
Both at bottom and sides
At bottom
Could touch anywhere

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