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What is the correct answer?

4

Oldham's coupling is the

A. Second inversion of double slider crank chain

B. Third inversion of double slider crank chain

C. Second inversion of single slider crank chain

D. Third inversion of slider crank chain

Correct Answer :

B. Third inversion of double slider crank chain


Related Questions

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4

The Klein's diagram is useful to find

A. Displacement of various parts

B. Velocity of various parts

C. Acceleration of various parts

D. Angular acceleration of various parts

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4

In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring)

A. (S₁ + S₂)/h

B. (S₁ - S₂)/h

C. (S₁ + S₂)/2h

D. (S₁ - S₂)/2h

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4

Typewriter constitutes

A. Machine

B. Structure

C. Mechanism

D. Inversion

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4

The coefficient of fluctuation of speed is __________ of maximum fluctuation of speed and the mean speed.

A. Sum

B. Difference

C. Product

D. Ratio

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4

A spring controlled governor is said to be isochronous when the controlling force

A. Increases as the radius of rotation decreases

B. Increases as the radius of rotation increases

C. Decreases as the radius of rotation increases

D. Remain constant for all radii of rotation

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4

To connect two parallel and coplanar shafts the following type of gearing is used

A. Spur gear

B. Bevel gear

C. Spiral gear

D. None of the above

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4

A reed type tachometer use the principle of

A. Longitudinal vibration

B. Torsional vibration

C. Transverse vibration

D. Damped free vibration

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4

In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

A. 45 mm

B. Slightly less than 45 mm

C. Slightly more than 45 mm

D. 95 mm

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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 condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical)

A. sinα = b/c

B. cosα = c/b

C. tanα = c/2b

D. cotα = c/2b

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4

A kinematic chain is known as a mechanism when

A. None of the links is fixed

B. One of the links is fixed

C. Two of the links are fixed

D. None of these

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4

The periodic time of a compound pendulum is __________ when the distance between the point of suspension and the centre of gravity is equal to the radius of gyration of the body about its centre of gravity.

A. Zero

B. Minimum

C. Maximum

D. None of these

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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

Which of the following is an inversion of Single slider crank chain?

A. Beam engine

B. Rotary engine

C. Oldhams coupling

D. Elliptical trammel

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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

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

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

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

To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use?

A. Spur gear

B. Spiral gear

C. Bevel gear

D. Worm gear

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4

Which of the following would constitute a link?

A. Piston, piston rod and cross head

B. Piston and piston rod

C. Piston rod and cross head

D. Piston, crank pin and crank shaft

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4

When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to

A. Zero

B. One

C. π/2

D. π

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4

In order to balance the reciprocating masses,

A. Primary forces and couples must be balanced

B. Secondary forces and couples must be balanced

C. Both (A) and (B)

D. None of these

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4

Which of the following is an inversion of a single slider crank chain?

A. Pendulum pump

B. Oscillating cylinder engine

C. Rotary internal combustion engine

D. All of these

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4

A circle passing through the pitch point with its center at the center of cam axis is known as

A. Pitch circle

B. Base circle

C. Prime circle

D. Outer circle

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4

The lead screw of a lathe with nut forms a

A. Rolling pair

B. Sliding pair

C. Screw pair

D. Turning pair

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4

The velocity of the rubbing surface __________ with the distance from the axis of the bearing.

A. Increases

B. Decreases

C. Remain same

D. None of these

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4

To obviate axial thrust, following gear drive is used

A. Double helical gears having opposite teeth

B. Double helical gears having identical teeth

C. Single helical gear in which one of the teeth of helix angle a is more

D. Mutter gears

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4

The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as

A. Static friction

B. Dynamic friction

C. Limiting friction

D. Coefficient of friction

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4

The minimum force required to slide a body of weight W on a rough horizontal plane is

A. W sinθ

B. W cosθ

C. W tanθ

D. W cosecθ

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4

The pressure angle of a cam depends upon

A. Offset between centre lines of cam and follower

B. Lift of follower

C. Angle of ascent

D. All of the above