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Theory of Machine

Theory of Machine
If the opposite links of a four bar linkage are equal, the links will always form a

Parallelogram
Pentagon
Rectangle
Triangle

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

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Theory of Machine
A foot step bearing and rotor of a vertical turbine form examples of

Successfully constrained motion
Incompletely constrained motion
Partially constrained motion
Completely constrained motion

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Theory of Machine
Which of the below are inversions of slider crank mechanism? 1. Oscillating cylinder engine mechanism 2. Toggle mechanism 3. Radial cylinder engine mechanism 4. Quick return mechanism

1, 2 and 4
1, 3 and 4
2, 3 and 4
1, 2 and 3

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Theory of Machine
In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to

Have perfect balancing
Minimize the effect of secondary forces
Minimize the effect of primary forces
To start the locomotive quickly

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Theory of Machine
The D-slide valve is also known as

None of these
Inside admission valve
Piston slide valve
Outside admission valve

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MORE MCQ ON Theory of Machine

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