## Machine Design The acme threads are usually found on

Screw cutting lathes
Railway carriage couplings
Spindles of bench vices
Feed mechanism of machine tools

√(T/3m)
√(T/2m)
None of these
√(T/m)

## Machine Design In worm, gears, pitch lead angle is

Half the angle between two inclined faces in axial plane
None of these
The angle between the tangent to the pitch helix and an element of the cylinder
The angle between the tangent to the pitch helix and the plane of rotation

## Machine Design According to Indian standard specifications, 100 H6/g5 means that

Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7
Tolerance grade for the shaft is 6 and for the hole is 5
Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7
Tolerance grade for the hole is 6 and for the shaft is 5

## Machine Design The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given byWhere m = mass of belt per meter (kg/m)v = belt velocity (m/s)f = coefficient of frictiona = angle of wrap (radians)

(P1 - mv²)/ (P2 - mv²) = e–ᶠα
P1 / P2 = eᶠα
(P1 - mv²)/ (P2 - mv²) = eᶠα
P1 / P2 = e–ᶠα

Knuckle joint
Universal joint
Cotter joint
Oldham coupling