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Machine Design

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

360°
180°
120°
270°

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Machine Design
Which of the following screw thread is used for power transmission in one direction only?

Multiple threads
Buttress threads
Square threads
Acme threads

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Machine Design
According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than

2 d
d
2.5 d
1.5 d

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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-half
One-fourth
Double
One-eighth

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Machine Design
A self locking screw has

Fine threads
Hole for inserting split pin
Course threads
Coefficient of friction is greater than tangent of load angle

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

152°
40°
122°
136°

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