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Machine Design

Machine Design
For general industrial machinery, the ratio of the length of journal to its diameter is taken as

3 to 5
5 to 10
0.5 to 1
1 to 2

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Machine Design
In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing.

Either A or B
None of these
Thin film
Thick film

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Machine Design
A steel containing _________ 0.8% carbon is known as hypo-eutectoid steel.

Greater than
Less than
Equal to
None of these

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Machine Design
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

2080 d
2840 d
1420 d
1680 d

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Machine Design
The design of shafts made of brittle materials is based on

St Venant's theory
Von Mises theory
Rankine's theory
Guest's theory

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Machine Design
The maximum efficiency of a square threaded screw is

(1 + sinφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + cosφ)
(1 + cosφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + sinφ)

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