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Machine Design

Machine Design
According to Indian standards, total numbers of fundamental deviations are

15
10
25
20

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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)

(WD/ πd3) × K
(4WD/ πd3) × K
(8WD/ πd3) × K
(2WD/ πd3) × K

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Machine Design
A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as

Angular bevel gears
Mitre gears
Internal bevel gears
Crown Bevel gears

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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

εc + εl²
εc + 2εl
2εc + εl
εc² + εl

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Machine Design
In a partial journal bearing, the angle of contact of the bearing with the journal is

360°
120°
180°
270°

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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-half
One-eighth
Double

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