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Machine Design

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

None of these
Less than
Greater than
Equal to

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Machine Design
The suitable material for belt used in flour mill is

Balata gum
Canvas or cotton duck
Leather
Rubber

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Machine Design
The dynamic tooth load is due to

All of these
Inaccuracies of tooth spacing
Deflections of teeth under load
Irregularities in tooth profiles

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Machine Design
Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

(k₁ + k₂)/ (k₁ k₂)
(k₁ - k₂)/ (k₁ k₂)
(k₁ - k₂)/ (k₁ + k₂)
(k₁ k₂)/ (k₁ + k₂)

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Machine Design
The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

12
18
14
24

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Machine Design
Stress concentration factor is defined as the ratio of

Nominal stress to the endurance limit
Maximum stress to the nominal stress
Nominal stress to the maximum stress
Maximum stress to the endurance limit

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