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Theory of Machine

Theory of Machine
The total number of instantaneous centers for a mechanism consisting of n links are

n - 1
n(n - 1)/2
n/2
n

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Theory of Machine
The rotating shafts tend to vibrate violently at whirling speeds because

The system is unbalanced
The shafts are rotating at very high speeds
Resonance is caused due to the heavy mass of the rotor
Bearing centre line coincides with the axis

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Theory of Machine
The displacement of a flat faced follower when it has contact with the flank of a circular arc cam, is given by (where R = Radius of flank, r₁ = Minimum radius of the cam, and θ = Angle turned through by the cam)

(R - r₁) (1 - cosθ)
R (1 - cosθ)
R (1 - sinθ)
(R - r₁) (1 - sinθ)

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

Sliding pair
Rolling pair
Turning pair
Screw pair

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Theory of Machine
The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve.

Greater than
Equal to
Less than
None of these

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Theory of Machine
A torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to

G.I₂
G².I₂
I₂/G²
I₂/G

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