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Theory of Machine

Theory of Machine
In full depth involute system, the smallest number of teeth in a pinion which meshes with rack without interference is

16
32
12
25

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

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

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Theory of Machine
Balancing of rotating and reciprocating parts of an engine is necessary when it runs at

Moderate speed
Highs peed
Slow speed
Any one of these

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Theory of Machine
The factional torque for square thread at the mean radius r while raising load W is given by

T = W.r tanα
T = W.r tan(φ - α)
T = W.r tanφ
T = W.r tan(φ + α)

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Theory of Machine
The motion between a pair which takes place in ____ is known as incompletely constrained motion.

One direction only
More than one direction
Two directions only
None of the listed here

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Theory of Machine
A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when

a is +ve and b = 0
a is +ve and b is also +ve
a is +ve and b is -ve
a = 0 and b is +ve

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