THEORY OF MACHINE QUIZ

Whirling speed of the shaft is the speed at which

Torsional vibrations occur

Shaft tends to vibrate vigorously in transverse direction

Combination of transverse and longitudinal vibration occurs

Shaft tends to vibrate in longitudinal direction

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If the controlling force line for a spring controlled governor when produced intersects the Y-axis at the origin, then the governor is said to be

Stable

Unstable

None of the listed here

Isochronous

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The Coriolis component of acceleration leads the sliding velocity by

45°

90°

135°

180°

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Transmission angle is the angle between

Input link and coupler

Output link and coupler

Output link and fixed link

Input link and fixed link

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When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by (where r = Pitch circle radius of pinion, R = Pitch circle radius of wheel, and φ = Pressure angle)

[(r² + R²) cosφ]/2

[(r + R) cosφ]/2

[(r + R) sinφ]/2

[(r² + R²) sinφ]/2

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A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is

9,360 r.p.m.

6,000 r.p.m.

12,000 r.p.m.

5,367 r.p.m.

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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 unbalanced force due to reciprocating masses

Constant in magnitude and direction both

Varies in magnitude and direction both

Varies in magnitude but constant in direction

Varies in direction but constant in magnitude

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The instantaneous center of a rigid thin disc rolling on a plane rigid surface is located at

An infinite distance on the plane surface

The point on the circumference situated vertically opposite to the contact point

The center of the disc

The point of contact

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An exact straight line motion mechanism is a

Scott-Russell's mechanism

Peaucellier's mechanism

All of these

Hart's mechanism

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