THEORY OF MACHINE QUIZ

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 clockwise 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

TRUE ANSWER : ?
YOUR ANSWER : ?

In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve.

None of these

Equal to

Less than

Greater than

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The critical speed of a shaft in revolution per second is __________ as that of natural frequency of transverse vibration.

None of these

Same

Unpredictable

Different

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Two systems shall be dynamically equivalent when

All of these

M.I. of two about an axis through e.g. is equal

The mass of two are same

G. of two coincides

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The lower pair is a

Point contact pair

Open pair

Closed pair

Sliding pair

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The ratio of height of Porter governor (when length of arms and links are equal) to the height of Watt's governor is (where m = Mass of the ball, and M = Mass on the sleeve)

m/(m + M)

(m + M)/M

(m + M)/m

M/(m + M)

TRUE ANSWER : ?
YOUR ANSWER : ?

A rigid body possesses ________degrees of freedom

Six

One

Two

Four

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When the two elements of a pair have __________ when in motion, it is said to a lower pair.

Body contact

Surface contact

Line or point contact

None of these

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A universal joint is an example of

Higher pair

Lower pair

Sliding pair

Rolling pair

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If ‘D₁’ and ‘D₂’ be the diameters of driver and driven pulleys, then belt speed is proportional to

D₁.D₂

D₁

D₁/D₂

D₂/D₁

TRUE ANSWER : ?
YOUR ANSWER : ?

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