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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

Rectangle
Triangle
Pentagon
Parallelogram

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Theory of Machine
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)

r cosφ
(r/2) cosφ
r tanφ
r sinφ

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Theory of Machine
The equation of free vibrations of a system is (d²x/dt²) +36 π²x, its natural frequency is

3 Hz
6π Hz
6 Hz
3π Hz

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Theory of Machine
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

45 mm
95 mm
Slightly less than 45 mm
Slightly more than 45 mm

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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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Theory of Machine
Which of the following is an open pair?

Lead screw and nut
Cam and follower
Journal bearing
Ball and socket joint

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MORE MCQ ON Theory of Machine

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