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4

The height of a Watt's governor is

A. Directly proportional to speed

B. Directly proportional to (speed)²

C. Inversely proportional to speed

D. Inversely proportional to (speed)²

Correct Answer :

D. Inversely proportional to (speed)²


Related Questions

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4

The dedendum circle diameter is equal to (where, φ = Pressure angle)

A. Pitch circle dia. × cosφ

B. Addendum circle dia. × cosφ

C. Clearance circle dia. × cosφ

D. Pitch circle dia. × sinφ

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4

In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if ω/ωn is

A. Equal to 1

B. Equal to 2

C. Less than 2

D. Greater than 2

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4

For an isochronous Hartnell governor (where r₁ and r₂ = Maximum and minimum radius of rotation of balls respectively, S₁ and S₂ = Maximum and minimum force exerted on the sleeve respectively, and M = Mass on the sleeve)

A. (m.g + S₁)/(m.g + S₂) = r₁/r₂

B. (m.g - S₁)/(m.g - S₂) = r₂/r₁

C. S₁/S₂ = r₁/r₂

D. S₂/S₁ = r₁/r₂

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4

Critical damping is a function of

A. Mass and stiffness

B. Mass and damping coefficient

C. Mass and natural frequency

D. Damping coefficient and natural frequency

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4

In S.H.M., acceleration is proportional to

A. Velocity

B. Displacement

C. Rate of change of velocity

D. All of the above

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4

A universal joint is an example of

A. Higher pair

B. Lower pair

C. Rolling pair

D. Sliding pair

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4

In under damped vibrating system, if x₁ and x₂ are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to

A. x₁/x₂

B. log(x₁/x₂)

C. loge(x₁/x₂)

D. log(x₁.x₂)

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4

The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)

A. m.ω².r sinθ

B. m.ω².r cosθ

C. m.ω².r (sin 2θ/n)

D. m.ω².r (cos 2θ/n)

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4

Pitch point of a cam is

A. A point on the pitch curve having minimum pressure angle

B. A point on the pitch curve having maximum pressure angle

C. Any point on the pitch curve

D. Any point on the pitch circle

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4

The number of links and instantaneous centers in a reciprocating engine mechanism are

A. 4, 4

B. 4, 5

C. 5, 4

D. 4, 6

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4

Which of the following mechanism is obtained from lower pair?

A. Gyroscope

B. Pantograph

C. Valve and valve gears

D. All of the above

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4

Power of a governor is the

A. Mean force exerted at the sleeve for a given percentage change of speed

B. Workdone at the sleeve for maximum equilibrium speed

C. Mean force exerted at the sleeve for maximum equilibrium speed

D. None of the above

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4

Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of a cross belt drive. The length of the belt is

A. π (r₁ + r₂) + [(r₁ + r₂)²/x] + 2x

B. π (r₁ + r₂) + [(r₁ - r₂)²/x] + 2x

C. π (r₁ - r₂) + [(r₁ - r₂)²/x] + 2x

D. π (r₁ - r₂) + [(r₁ + r₂)²/x] + 2x

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4

The height of a Watt's governor (in metres) is equal to (where N = Speed of the arm and ball about the spindle axis)

A. 8.95/N²

B. 89.5/N²

C. 895/N²

D. 8950/N²

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4

In a coupling rod of a locomotive, each of the four pairs is a ________ pair.

A. Sliding

B. Turning

C. Rolling

D. Screw

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4

Which of the following disciplines provides study of relative motion between the parts of a machine?

A. Theory of machines

B. Applied mechanics

C. Mechanisms

D. Kinematics

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4

In a simple harmonic motion, the velocity vector with respect to displacement vector

A. Is in phase

B. Leads by 90°

C. Leads by 180°

D. Lags by 90°

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4

A pulley and belt in a belt drive form a

A. Cylindrical pair

B. Turning pair

C. Rolling pair

D. Sliding pair

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4

Angle of dwell of cam is defined as the angle

A. During which the follower returns to its initial position

B. Of rotation of the cam for definite displacement of the follower

C. Through which the cam rotates during the period in which the follower remains in the highest position

D. Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

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4

If ω/ωn = 2, where co is the frequency of excitation and ωn is the natural frequency of vibrations, then the transmissibility of vibration will the

A. 0.5

B. 1

C. 1.5

D. 2

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4

If there are L number of links in a mechanism, then number of possible inversions is equal to

A. L + 1

B. L - 1

C. L

D. L + 2

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4

Ackermann steering gear consists of

A. Sliding pairs

B. Turning pairs

C. Rolling pairs

D. Higher pairs

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4

Which of the following is a higher pair?

A. Turning pair

B. Screw pair

C. Belt and pulley

D. None of the above

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4

Which gear is used for connecting two coplanar and intersecting shafts?

A. Spur gear

B. Helical gear

C. Bevel gear

D. None of the above

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4

Which of the following is a higher pair?

A. Belt and pulley

B. Turning pair

C. Screw pair

D. Sliding pair

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4

The centre distance between two meshing involute gears is equal to

A. Sum of base circle radii/cosφ

B. Difference of base circle radii/ cosφ

C. Sum of pitch circle radii/ cosφ

D. Difference of pitch circle radii/ cosφ

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4

The unbalanced force due to revolving masses

A. Varies in magnitude but constant in direction

B. Varies in direction but constant in magnitude

C. Varies in magnitude and direction both

D. Constant in magnitude and direction both

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4

A point on a connecting link (excluding end points) of a double slider crank mechanism traces a

A. Straight line path

B. Hyperbolic path

C. Parabolic path

D. Elliptical path

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4

Angular acceleration of a link can be determined by dividing the

A. Centripetal component of acceleration with length of link

B. Tangential component of acceleration with length of link

C. Resultant acceleration with length of link

D. All of the above

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4

A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

A. 2 mm

B. 2.22 mm

C. 2.50 mm

D. 3.0 mm