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4

Which of the following is a spring controlled governor?

A. Hartnell governor

B. Hartung governor

C. Wilson-Hartnell governor

D. All of these

Correct Answer :

D. All of these


Related Questions

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A Hartnell governor is a

A. Dead weight governor

B. Pendulum type governor

C. Spring loaded governor

D. Inertia governor

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A governor is said to be stable, if the

A. Radius of rotation of balls increases as the equilibrium speed decreases

B. Radius of rotation of balls decreases as the equilibrium speed decreases

C. Radius of rotation of balls increases as the equilibrium speed increases

D. Radius of rotation of balls decreases as the equilibrium speed increases

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4

When the primary direct crank of a reciprocating engine makes an angle of θ with the line of stroke, then the secondary direct crank will make an angle of _________ with the line of stroke.

A. θ/2

B. θ

C.

D.

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4

The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft, and I = Mass moment of inertia of the disc attached at the end of a shaft)

A. 2π. √(q/I)

B. 2π qI

C. (1/2π). √(q/I)

D. 1/2π

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4

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

A. Line or point contact

B. Surface contact

C. Body contact

D. None of these

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4

The relation between number of pairs (p) forming a kinematic chain and the number of links (l) is

A. l = 2p - 2

B. l = 2p - 3

C. l = 2p - 4

D. l = 2p - 5

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4

The swaying couple is due to the

A. Primary unbalanced force

B. Secondary unbalanced force

C. Two cylinders of locomotive

D. Partial balancing

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4

A body will begin to move down an inclined plane, if the angle of inclination of the plane is ________ the angle of friction.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

A. ω (r₁ r₂) sinθ

B. ω (r₁ + r₂) sinθ sec2θ

C. ω (r₁ r₂) cosθ

D. ω (r₁ + r₂) cosθ cosec2θ

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4

A pantograph is a mechanism with

A. Lower pairs

B. Higher pairs

C. Rolling pairs

D. Turning pairs

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Coriolis component is encountered in

A. Quick return mechanism of shaper

B. Four bar chain mechanism

C. Slider crank mechanism

D. Both (A) and (C) above

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4

The Klein's method of construction for reciprocating engine mechanism

A. Is a simplified version of instantaneous centre method

B. Utilises a quadrilateral similar to the diagram of mechanism for reciprocating engine

C. Enables determination of coriolis component

D. Is based on the acceleration diagram

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4

What is the number of instantaneous centres for an eight link mechanism?

A. 15

B. 28

C. 30

D. 8

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If the number of links in a mechanism is equal to l, then the numbers of possible inversions are equal to

A. l - 2

B. l - 1

C. l

D. l + 1

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Lower pairs are those which have

A. Point or line contact between the two elements when in motion

B. Surface contact between the two elements when in motion

C. Elements of pairs not held together mechanically

D. Two elements that permit relative motion

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4

The motion of a shaft in a circular hole is an example of

A. Completely constrained motion

B. Incompletely constrained motion

C. Successfully constrained motion

D. None of these

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4

The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as

A. Turning pair

B. Rolling pair

C. Sliding pair

D. Spherical pair

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4

The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to

A. 90° and 180°

B. 45° and 225°

C. 180° and 270°

D. 270° and 360°

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4

The driving and driven shafts connected by a Hooke's joint will have equal speeds, if

A. cosθ = sinα

B. sinθ = ± tanα

C. tanθ = ± cosα

D. cotθ = cosα

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4

In a hydrodynamic journal bearing, there is

A. A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing

B. A thick film of lubricant between the journal and the bearing

C. No lubricant between the journal and the bearing

D. A forced lubricant between the journal and the bearing

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4

If the damping factor for a vibrating system is unity, then the system will be

A. Over damped

B. Under damped

C. Critically damped

D. Without vibrations

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4

In a pantograph, all the pairs are

A. Turning pairs

B. Sliding pairs

C. Spherical pairs

D. Self-closed pairs

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4

The relation between the controlling force (Fc) and radius of rotation (r) for a stable spring controlled governor is

A. Fc = ar + b

B. Fc = ar - b

C. Fc = ar

D. Fc = a/r + b

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4

The contact ratio for gears is

A. Zero

B. Less than one

C. Greater than one

D. Infinity

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4

Which of the following mechanisms produces mathematically an exact straight line motion?

A. Grasshopper mechanism

B. Watt mechanism

C. Peaucellier's mechanism

D. Tchebicheff mechanism

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4

When the pitching of a ship is __________ the effect of gyroscopic couple acting on it will be to move the ship towards port side.

A. Upward

B. Downward

C. Forward

D. Backward

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4

Which of the following is a spring controlled governor?

A. Hartnell governor

B. Hartung governor

C. Wilson-Hartnell governor

D. All of these

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4

A system in dynamic balance implies that

A. The system is critically damped

B. There is no critical speed in the system

C. The system is also statically balanced

D. There will absolutely no wear of bearings

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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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The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

A. 12

B. 14

C. 18

D. 24