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Theory of Machine

Theory of Machine
A higher pair has__________.

Point contact
No contact
None of these
Surface contact

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Theory of Machine
A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is

5,367 r.p.m.
9,360 r.p.m.
6,000 r.p.m.
12,000 r.p.m.

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Theory of Machine
In involute gears, the pressure angle is

Always variable
Dependent on the size of gears
Always constant
Dependent on the size of teeth

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Theory of Machine
The working depth of a gear is the radial distance from the

Pitch circle to the bottom of a tooth
Addendum circle to the clearance circle
Top of a tooth to the bottom of a tooth
Pitch circle to the top of a tooth

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Theory of Machine
An automobile steering gear is an example of

Sliding pair
Lower pair
Rolling pair
Higher pair

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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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