A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

4 τ

2 τ

τ/2

τ

4 τ

2 τ

τ/2

τ

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Machine Design
The maximum efficiency of a square threaded screw is

(1 + sinφ)/ (1 - sinφ)

(1 - sinφ)/ (1 + sinφ)

(1 + cosφ)/ (1 - sinφ)

(1 - sinφ)/ (1 + cosφ)

(1 + sinφ)/ (1 - sinφ)

(1 - sinφ)/ (1 + sinφ)

(1 + cosφ)/ (1 - sinφ)

(1 - sinφ)/ (1 + cosφ)

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Machine Design
The piston rod of a steam engine is usually connected to the cross-head by means of

Universal joint

Bolted joint

Knuckle joint

Cotter joint

Universal joint

Bolted joint

Knuckle joint

Cotter joint

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Machine Design
The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

One-half

Double

One-third

One-fourth

One-half

Double

One-third

One-fourth

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Machine Design
The effective stress in wire ropes during normal working is equal to the stress due to

Bending plus stress due to acceleration/retardation

Axial load plus stress due to bending

Axial load plus stress due to acceleration/retardation

Acceleration/retardation of masses plus stress due to bending

Bending plus stress due to acceleration/retardation

Axial load plus stress due to bending

Axial load plus stress due to acceleration/retardation

Acceleration/retardation of masses plus stress due to bending

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Machine Design
The product of the diametral pitch and circular pitch is equal to

π × number of teeth

1

1/π

π

π × number of teeth

1

1/π

π

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Machine Design

Machine Design The maximum efficiency of a square threaded screw is

Machine Design The piston rod of a steam engine is usually connected to the cross-head by means of

Machine Design The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

Machine Design The effective stress in wire ropes during normal working is equal to the stress due to

Machine Design The product of the diametral pitch and circular pitch is equal to

Machine Design
The maximum efficiency of a square threaded screw is

Machine Design
The piston rod of a steam engine is usually connected to the cross-head by means of

Machine Design
The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

Machine Design
The effective stress in wire ropes during normal working is equal to the stress due to

Machine Design
The product of the diametral pitch and circular pitch is equal to