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Theory of Machine

Theory of Machine
When a ship travels in a sea, which of the effect is more dangerous

Rolling
All of these
Steering
Pitching

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Theory of Machine
The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is

Universal coupling
Oldham's coupling
Chain coupling
Flexible coupling

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Theory of Machine
The ratio of the driving tensions for V-belts is __________ times that of flat belts.(Where β = Semi-angle of the groove)

secβ
cosecβ
cosβ
sinβ

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Theory of Machine
The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction)

α = 90° + φ
α = 45° - φ/2
α = 90° - φ
α = 45° + φ/2

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Theory of Machine
In a four stroke I.C. engine, the turning moment during the compression stroke is

Negative throughout
Positive throughout
Positive during major portion of the stroke
Negative during major portion of the stroke

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Theory of Machine
The Grubler's criterion for determining the degrees of freedom (n) of a mechanism having plane motion is (where l = Number of links, and j = Number of binary joints)

n = 4(l - 1) - 3j
n = 3(l - 1) - 2j
n = 2(l - 1) - 2j
n = (l -1) - j

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