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Machine Design

Machine Design
The crest diameter of a screw thread is same as

Pitch diameter
Major diameter
Core diameter
Minor diameter

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Machine Design
The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be

εc² + εl
εc + εl²
2εc + εl
εc + 2εl

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Machine Design
In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as

Pressure angle
Helix angle
Pitch lead angle
None of these

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Machine Design
The shear plane in case of bolts should

Be parallel to axis of bolt
Be across threaded portion of shank
Never be across the threaded portion
Be normal to threaded portion of shank

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Machine Design
In block brakes, the ratio of shoe width to wheel diameter is taken between

0.25 and 0.50
0.50 and 0.75
0.1 and 0.25
0.75 and 1

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Machine Design
A locking device extensively used in automobile industry is a

Sawn nut
Jam nut
Castle nut
Ring nut

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