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Theory of Machine

Theory of Machine
The lead screw of a lathe with nut forms a

Turning pair
Rolling pair
Screw pair
Sliding pair

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Theory of Machine
A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)

None of these
m₁ r₁ = m₂ r₂
m₁ r₂ = m₂ r₁
m₁ m₂ = r₁ r₂

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Theory of Machine
The factional torque for square thread at the mean radius r while raising load W is given by

T = W.r tanφ
T = W.r tanα
T = W.r tan(φ + α)
T = W.r tan(φ - α)

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Theory of Machine
In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to

0.8
0.2
0.6
0.4

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Theory of Machine
Module of a gear is

2T/D
T/D
D/T
2D/T

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Theory of Machine
The effort of a Porter governor is equal to (where c = Percentage increase in speed, m = Mass of ball, and M = Mass on the sleeve)

c/(m + M) g
c/(m - M) g
c (m - M) g
c (m + M) g

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MORE MCQ ON Theory of Machine

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