MACHINE DESIGN QUIZ

Jam nut

Castle nut

Ring nut

Sawn nut

0.75 × diameter of bolt

1.5 × diameter of bolt

1.25 × diameter of bolt

Diameter of bolt

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

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

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

None of these

Increasing

Both A and B

Reducing

Diametral pitch

Pitch circle diameter

Pressure angle

Circular pitch

Upper leaf

Master leaf

None of these

Lower leaf

Inversely proportional to the applied torque and the polar moment of inertia

Directly proportional to the polar moment of inertia and to the distance of the point from the axis

Directly proportional to the applied torque and inversely proportional to the polar moment of inertia

Directly proportional to the applied torque and the polar moment of inertia

Moderate

High

None of these

Low

43869

44047

43929

44045

Self locking bolts

Designed for shock load

Provided with hexagonal depression in head

Used in aircraft application