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Theory of Machine

Theory of Machine
For an involute gear, the ratio of base circle radius and pitch circle radius is equal to

sinφ
secφ
cosφ
cosecφ

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Theory of Machine
In railway axle boxes, the bearing used is

Double row self aligning ball bearing
Double row spherical roller bearing
Deep groove ball bearing
Cylindrical roller bearing

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Theory of Machine
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO. The acceleration of the piston P with respect to the crank-pin C is given by

ω² × NO
ω² × CO
ω² × CN
ω² × QN

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Theory of Machine
A rotary internal combustion engine has __________ cylinders.

Five
Seven
Four
Six

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Theory of Machine
The velocity of sliding of meshing gear teeth is (Where ω₁ and ω₂ are angular velocities of meshing gears and ‘y’ is distance between point of contact and the pitch point)

(ω₁ × ω₂) y
(ω₁/ω₂) y
(ω₁ + ω₂)/y
(ω₁ + ω₂) y

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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.

Less than
Greater than
Equal to
None of these

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