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4

It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by

A. Universal joint

B. Knuckle joint

C. Oldham's coupling

D. Flexible coupling

Correct Answer :

C. Oldham's coupling


Related Questions

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4

Oldhams coupling is an inversion of the kinematic chain used in

A. Whitworth quick return mechanism

B. Elliptical trammels

C. Rotary engine

D. Universal joint

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4

At the nodal point in a shaft, the amplitude for torsional vibration will be

A. Minimum

B. Maximum

C. Zero

D. Infinity

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4

Creep in belt drive is due to

A. Weak material of the belt

B. Weak material of the pulley

C. Uneven extensions and contractions of the belt when it passes from tight side to slack side

D. Expansion of the belt

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4

For a twin cylinder V-engine, the crank positions for primary reverse cranks and secondary direct cranks are shown in the below figure. The engine is a

A. 30° V-engine

B. 60° V-engine

C. 120° V-engine

D. 150° V-engine

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4

For dynamic balancing of a shaft

A. The net dynamic force acting on the shaft is equal to zero

B. The net couple due to the dynamic forces acting on the shaft is equal to zero

C. Both (A) and (B)

D. None of the above

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4

The distance by which the __________ of the D-slide valve overlaps the steam port is called exhaust lap.

A. Inner edge

B. Outer edge

C. Corners

D. None of these

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4

Sensitiveness of the governor is defined as the ratio of the

A. Mean speed to the maximum equilibrium speed

B. Mean speed to the minimum equilibrium speed

C. Difference of the maximum and minimum equilibrium speeds to the mean speed

D. Sum of the maximum and minimum equilibrium speeds to the mean speed

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4

The example of higher pair is

A. Belt, rope and chain drives

B. Gears, cams

C. Ball and roller bearings

D. All of the above

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4

In a shaper mechanism, the Coriolis component of acceleration will

A. Not exist

B. Exist

C. Depend on position of crank

D. None of the above

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4

Transmission of power from the engine to the rear axle of an automobile is by means of

A. Compound gears

B. Worm and wheel method

C. Hooke's joint

D. Crown gear

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4

In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is

A.

B. 90°

C. 180°

D. 270°

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4

When a point at the end of a link moves with constant angular velocity, its acceleration will have

A. Radial component only

B. Tangential component only

C. Coriolis component only

D. Radial and tangential components both

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4

The advantage of the piston valve over the slide valve is that in the former case

A. Wear is less

B. Power absorbed is less

C. Both wear and power absorbed are low

D. The pressure developed being high provides tight sealing

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4

The magnitude of velocities of the points on a rigid link is

A. Directly proportional to the distance from the points to the instantaneous centre and is parallel to the line joining the point to the instantaneous centre

B. Directly proportional to the distance from the points to the instantaneous centre and is perpendicular to the line joining the point to the instantaneous centre

C. Inversely proportional to the distance from the points to the instantaneous centre and is parallel to the line joining the point to the instantaneous centre

D. Inversely proportional to the distance from the points to the instantaneous centre and is perpendicular to the line joining the point to the instantaneous centre

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4

The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is

A. 1

B. 2

C. 3

D. 4

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4

In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces will be

A. n₁ + n₂

B. n₁ + n₂ + 1

C. n₁ + n₂ - 1

D. n₁ + n₂ - 2

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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 equivalent length of a simple pendulum which gives the same frequency as a compound pendulum is

A. h/(kG² + h²)

B. (kG² + h²)/h

C. h²/(kG² + h²)

D. (kG² + h²)/h²

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4

In railway axle boxes, the bearing used is

A. Deep groove ball bearing

B. Double row self aligning ball bearing

C. Double row spherical roller bearing

D. Cylindrical roller bearing

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4

Coriolis component acts

A. Perpendicular to sliding surfaces

B. Along sliding surfaces

C. Somewhere in between above two

D. None of the above

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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

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

A. Free vibration

B. Forced vibration

C. Damped vibration

D. Under damped vibration

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4

A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when

A. a is +ve and b = 0

B. a = 0 and b is +ve

C. a is +ve and b is -ve

D. a is +ve and b is also +ve

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4

Open 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

Which of the following statement is correct?

A. For constant velocity ratio transmission between two gears, the common normal at the point of contact must always pass through a fixed point on the line joining the centres of rotation of gears.

B. For involute gears, the pressure angle changes with the change in centre distance between gears.

C. The epicyclic gear trains involve rotation of atleast one gear axis about some other gear axis.

D. All of the above

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4

A Porter governor is a

A. Pendulum type governor

B. Dead weight governor

C. Spring loaded governor

D. Inertia governor

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4

The absolute acceleration of any point P in a link about center of rotation O is

A. Along PO

B. Perpendicular to PO

C. At 45° to PO

D. None of the above

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4

When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will

A. Return to equilibrium position without oscillation

B. Oscillate with increasing time period

C. Oscillate with decreasing amplitude

D. Oscillate with constant amplitude

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4

Which of the following is a pendulum type governor?

A. Watt governor

B. Porter governor

C. Hartnell governor

D. None of these

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4

When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable.

A. Remains constant

B. Decreases

C. Increases

D. None of these