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Theory of Machine

Theory of Machine
When one of the links of a kinematic chain is fixed, the chain is known as a

Inversion
Structure
Mechanism
Machine

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Theory of Machine
In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)

P = W cos(α + φ)
P = W tan(α - φ)
P = W tan(φ - α)
P = W tan(α + φ)

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Theory of Machine
Cylindrical cams can be classified as

Reciprocating
None of these
Tangent
Circular

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Theory of Machine
In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from

70°- 80°
80°- 90°
50°- 60°
60°-70°

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Theory of Machine
The transmissibility, for all values of damping factor, will be less than unity, if ω/ωn is

Less than 2
Equal to 1
Equal to 2
Greater than 2

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Theory of Machine
There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is

1/8
1/24
12
4/15

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