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Machine Design

Machine Design
The constant factor in case of R10 series of preferred numbers is

1.26
1.58
1.06
1.12

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Machine Design
In Vickers hardness testing, the pyramid indentor apex is

136°
122°
152°
40°

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

8W/9
2W/3
W/9
W/2

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Machine Design
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

σ [1 + (3a/b)]
σ [1 + (2a/b)]
σ [1 + (b/2a)]
σ [1 + (b/3a)]

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Machine Design
For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be

10
8
4
6

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Machine Design
A crankshaft is a __________ shaft.

Transmission
Machine frame
Machine
None of these

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