Elastic nut is a locking device in which

A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called

A

Ring nut

B

Castle nut

C

Sawn nut

D

Jam nut

Jam nut is a locking device in which

A

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

B

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

C

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

D

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

Split nut is a locking device in which

A

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

B

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

C

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

D

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

Castle nut is a locking device in which

A

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

B

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

C

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

D

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

Three elastic constants for a completely anisotropic elastic material which follows the Hooke's law are young's modulus, elastic limit stress and yield stress. Which of the following properties is most sensitive to increase in strain rate ?

A

Tensile strength

B

Elastic limit

C

Proportional limit

D

Yield strength

When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)

A

0.5 d

B

0.75 d

C

d

D

1.25 d

If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to

A

Diameter of bolt

B

0.75 × diameter of bolt

C

1.25 × diameter of bolt

D

1.5 × diameter of bolt

For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

A

0.4 times

B

0.6 times

C

0.7 times

D

0.8 times

The pitch of threads on a Jock nut in comparison to pitch of nut is

A

Same

B

Coarser

C

Finer

D

Very fine

A locking device extensively used in automobile industry is a

A

Jam nut

B

Castle nut

C

Sawn nut

D

Ring nut

Elastic nut is a locking device in which

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