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)

(4WD/ πd3) × K

(WD/ πd3) × K

(8WD/ πd3) × K

(2WD/ πd3) × K

(4WD/ πd3) × K

(WD/ πd3) × K

(8WD/ πd3) × K

(2WD/ πd3) × K

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Machine Design
The pitch diameter is the __________ diameter of an external or internal screw thread.

Largest

Smallest

None of these

Effective

Largest

Smallest

None of these

Effective

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Machine Design
An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load ‘W’. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.

One-fourth

One-eighth

Double

One-half

One-fourth

One-eighth

Double

One-half

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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

63 to 70%

45 to 60%

80 to 90%

70 to 83%

63 to 70%

45 to 60%

80 to 90%

70 to 83%

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Machine Design
In order to permit the thermal expansion/contraction of tubing, it should be

Honed

Bent

Crimped

Flared

Honed

Bent

Crimped

Flared

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Machine Design
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

Smaller than

Larger than

Equal to

None of these

Smaller than

Larger than

Equal to

None of these

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Machine Design

Machine Design The pitch diameter is the __________ diameter of an external or internal screw thread.

Machine Design An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load ‘W’. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.

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 permit the thermal expansion/contraction of tubing, it should be

Machine Design In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

Machine Design
The pitch diameter is the __________ diameter of an external or internal screw thread.

Machine Design
An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load ‘W’. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.

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 permit the thermal expansion/contraction of tubing, it should be

Machine Design
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.