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Theory of Machine

Theory of Machine
A rigid body possesses ________degrees of freedom

Four
Six
One
Two

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Theory of Machine
In a four stroke I.C. engine, the turning moment during the compression stroke is

Positive throughout
Negative during major portion of the stroke
Positive during major portion of the stroke
Negative throughout

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Theory of Machine
A watt's governor can work satisfactorily at speeds from

200 to 300 r.p.m.
80 to 100 r.p.m.
100 to 200 r.p.m.
60 to 80 r.p.m.

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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

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

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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

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

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Theory of Machine
In under damped vibrating system, if x₁ and x₂ are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to

x₁/x₂
log(x₁.x₂)
log(x₁/x₂)
loge(x₁/x₂)

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