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) r

(ω₁ - ω₂) 2r

(ω₁ + ω₂) r

ω₁.ω₂.r

(ω₁ - ω₂) r

(ω₁ - ω₂) 2r

(ω₁ + ω₂) r

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Theory of Machine
When the sleeve of a Porter governor moves upwards, the governor speed

Decreases

Increases

Remain unaffected

First increases and then decreases

Decreases

Increases

Remain unaffected

First increases and then decreases

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is _________ as compared to uniform wear.

More

Same

Less

None of the listed here

More

Same

Less

None of the listed here

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Theory of Machine
In considering friction of a V-thread, the virtual coefficient of friction (μ₁) is given by

μ₁ = μ cos β

μ₁ = μ sin β

μ₁ = μ/sin β

μ₁ = μ/cos β

μ₁ = μ cos β

μ₁ = μ sin β

μ₁ = μ/sin β

μ₁ = μ/cos β

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Theory of Machine
The danger of breakage and vibration is maximum

None of these

Above the critical speed

Near the critical speed

Below the critical speed

None of these

Above the critical speed

Near the critical speed

Below the critical speed

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Theory of Machine
Which of the following statements regarding laws governing the friction between dry surfaces are correct?

The friction force is dependent on the materials of the contact surfaces.

All of these

The friction force is directly proportional to the normal force.

The friction force is independent of me area of contact.

The friction force is dependent on the materials of the contact surfaces.

All of these

The friction force is directly proportional to the normal force.

The friction force is independent of me area of contact.

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Theory of Machine

Theory of Machine When the sleeve of a Porter governor moves upwards, the governor speed

Theory of Machine The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is _________ as compared to uniform wear.

Theory of Machine In considering friction of a V-thread, the virtual coefficient of friction (μ₁) is given by

Theory of Machine The danger of breakage and vibration is maximum

Theory of Machine Which of the following statements regarding laws governing the friction between dry surfaces are correct?

Theory of Machine
When the sleeve of a Porter governor moves upwards, the governor speed

Theory of Machine
The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is _________ as compared to uniform wear.

Theory of Machine
In considering friction of a V-thread, the virtual coefficient of friction (μ₁) is given by

Theory of Machine
The danger of breakage and vibration is maximum

Theory of Machine
Which of the following statements regarding laws governing the friction between dry surfaces are correct?