When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

(8WD/ πd3) × K

(2WD/ πd3) × K

(4WD/ πd3) × K

(WD/ πd3) × K

(8WD/ πd3) × K

(2WD/ πd3) × K

(4WD/ πd3) × K

(WD/ πd3) × K

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

Copper

Aluminium

Zinc

Mild steel

Copper

Aluminium

Zinc

Mild steel

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Machine Design
For high speed engines, the cam follower should move with

Simple harmonic motion

Uniform acceleration and retardation

Uniform velocity

Cycloidal motion

Simple harmonic motion

Uniform acceleration and retardation

Uniform velocity

Cycloidal motion

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Machine Design
Which is positive drive?

Timing belt

Flat belt drive

Crossed belt drive

V belt drive

Timing belt

Flat belt drive

Crossed belt drive

V belt drive

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Machine Design
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

45 to 60%

63 to 70%

70 to 83%

80 to 90%

45 to 60%

63 to 70%

70 to 83%

80 to 90%

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Machine Design
In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to

1.25 d

1 d

1.75 d

1.5 d

1.25 d

1 d

1.75 d

1.5 d

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Machine Design

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

Machine Design For high speed engines, the cam follower should move with

Machine Design Which is positive drive?

Machine Design According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

Machine Design In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to

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

Machine Design
For high speed engines, the cam follower should move with

Machine Design
Which is positive drive?

Machine Design
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

Machine Design
In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to