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Theory of Machine

Theory of Machine
If two moving elements have surface contact in motion, such pair is known as

Higher pair
Surface pair
Sliding pair
Rolling pair

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Theory of Machine
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m).(dx/dt) + (s/m).x = 0, if the roots of the equation are __________ then the system will be under damped.

None of these
Real
Complex conjugate
Equal

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

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Theory of Machine
Any point on a link connecting double slider crank chain will trace a

Ellipse
Circle
Straight line
Parabola

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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.

None of these
Equal to
Greater than
Less than

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Theory of Machine
Frequency of vibrations is usually expressed in

Number of cycles per second
None of these
Number of cycles per minute
Number of cycles per hour

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