The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

Theory of Machine
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

ω₁.ω₂.r

(ω₁ - ω₂) 2r

(ω₁ + ω₂) r

(ω₁ - ω₂) r

ω₁.ω₂.r

(ω₁ - ω₂) 2r

(ω₁ + ω₂) r

(ω₁ - ω₂) r

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Theory of Machine
Hammer blow

Varies inversely with the square of the speed

Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses

Varies as the square root of the speed

Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.

Varies inversely with the square of the speed

Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses

Varies as the square root of the speed

Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.

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Theory of Machine
The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line

Perpendicular to line as per (A)

Joining the corresponding points

Not possible to determine with these data

At 45° to line as per (A)

Perpendicular to line as per (A)

Joining the corresponding points

Not possible to determine with these data

At 45° to line as per (A)

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Theory of Machine
The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead center, and n = Ratio of length of connecting rod to the radius of crank)

ω²r [cos θ + (cos 2θ/n)]

ω²r [sin θ + (sin 2θ/n)]

ωr [sin θ + (sin 2θ/n)]

ωr [cos θ + (cos 2θ/n)]

ω²r [cos θ + (cos 2θ/n)]

ω²r [sin θ + (sin 2θ/n)]

ωr [sin θ + (sin 2θ/n)]

ωr [cos θ + (cos 2θ/n)]

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Theory of Machine
In a reciprocating steam engine, which of the following forms a kinematic link?

Piston rod and connecting rod

Flywheel and engine frame

Cylinder and piston

Crankshaft and flywheel

Piston rod and connecting rod

Flywheel and engine frame

Cylinder and piston

Crankshaft and flywheel

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Theory of Machine
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)

r tanφ

(r/2) cosφ

r cosφ

r sinφ

r tanφ

(r/2) cosφ

r cosφ

r sinφ

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Theory of Machine

Theory of Machine Hammer blow

Theory of Machine The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line

Theory of Machine The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead center, and n = Ratio of length of connecting rod to the radius of crank)

Theory of Machine In a reciprocating steam engine, which of the following forms a kinematic link?

Theory of Machine The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)

Theory of Machine
Hammer blow

Theory of Machine
The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line

Theory of Machine
The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead center, and n = Ratio of length of connecting rod to the radius of crank)

Theory of Machine
In a reciprocating steam engine, which of the following forms a kinematic link?

Theory of Machine
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)