THEORY OF MACHINE QUIZ

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 × CO

ω² × NO

ω² × QN

ω² × CN

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The steering of a ship means

Turning of a complete ship in a curve towards right or left, while it moves forward

Rolling of a complete ship sideways

None of these

Movement of a complete ship up and down in vertical plane about transverse axis

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The size of cam depends upon

Prime circle

Pitch circle

Base circle

Pitch curve

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When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

Under damped vibration

Forced vibration

Damped vibration

Free vibration

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In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to

0.8

0.2

0.4

0.6

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Which gear train is used for higher velocity ratios in a small space?

Simple gear train

Reverted gear train

Epicyclic gear train

Compound gear train

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Two systems shall be dynamically equivalent when

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

The mass of two are same

All of these

G. of two coincides

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The approximate straight line mechanism is a

8 bar linkage

6 bar linkage

3 bar linkage

Four bar linkage

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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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The mechanism in which two are turning pairs and two are sliding pairs, is called a

Elliptical trammel

Scotch yoke mechanism

Double slider crank chain

All of these

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