MACHINE DESIGN QUIZ

4μ sinθ/(θ + sinθ)

4μ sinθ/(2θ + sin 2θ)

μ sinθ/(2θ + sin 2θ)

2μ sinθ/(θ + sinθ)

Is inversely proportional to

Is directly proportional to

Does not depend upon

Is equal to cos φ multiplied by

External load applied

All of these

Initial tension due to tightening of the bolt

Relative elastic yielding of the bolt and the connected members

One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end

A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

A slot is cut partly is middle of nut and then slot reduced by tightening a screw

pd/σt

pd/3σt

pd/2σt

pd/4σt

29°

60°

55°

47°

Independent of size of teeth

Dependent on number of teeth of a gear

All of these

Dependent on system of teeth

There is no lubricant between the journal and the bearing

There is a thick film of lubricant between the journal and the bearing

The lubricant is forced between the journal and the bearing, by external pressure

There is a thin film of lubricant between the journal and the bearing

Less than 1/10

Greater than 1/10

None of these

Equal to 1/10

Four times

Three times

Twice

Equal to