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Current Affairs January 2024

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4

The Ackermann steering mechanism is preferred to the Davis type in automobiles because

A. The former is mathematically accurate

B. The former is having turning pair

C. The former is most economical

D. The former is most rigid

Correct Answer :

B. The former is having turning pair


Related Questions

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4

The frictional torque transmitted by a cone clutch is same as that of

A. Flat pivot bearing

B. Flat collar bearing

C. Conical pivot bearing

D. Truncated conical pivot bearing

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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

The tendency of a body to resist change from rest or motion is known as

A. Mass

B. Friction

C. Inertia

D. Resisting force

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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

Which of the following governor is used to drive a gramophone?

A. Watt governor

B. Porter governor

C. Pickering governor

D. Hartnell governor

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4

The centre of gravity of a coupler link in a four bar mechanism will experience

A. No acceleration

B. Only linear acceleration

C. Only angular acceleration

D. Both linear and angular acceleration

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4

Consider the following mechanisms:
1. Oscillating cylinder engine mechanism
2. Toggle mechanism
3. Radial cylinder engine mechanism
4. Quick return mechanism Which of the above are inversions of slider crank mechanism?

A. 1, 2 and 4

B. 2, 3 and 4

C. 1, 2 and 3

D. 1, 3 and 4

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4

Klein's construction can be used to determine acceleration of various parts when the crank is at

A. Inner dead centre

B. Outer dead centre

C. Right angles to the link of the stroke

D. All of the above

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4

Which of the following statement is correct?

A. The power absorbed in operating the piston valve is less than D-slide valve

B. The wear of the piston valve is less than the wear of the D-slide valve

C. The D-slide valve is also called outside admission valve.

D. All of the above

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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 distance between fixed pivots of crank and followers is

A. 95 mm

B. Slightly less than 95 mm

C. Slightly more than 95 mm

D. 45 mm

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4

The working depth of a gear is the radial distance from the

A. Pitch circle to the bottom of a tooth

B. Pitch circle to the top of a tooth

C. Top of a tooth to the bottom of a tooth

D. Addendum circle to the clearance circle

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4

A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tan φ = Coefficient of friction between the plane and the body)

A. P = W tan α

B. P = W tan (α + φ)

C. P = W (sin α + μ cos α)

D. P = W (cos α + μ sin α)

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4

When the particles of a body moves perpendicular to its axis, then the body is said to have

A. Longitudinal vibration

B. Transverse vibration

C. Torsional vibration

D. None of these

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4

In a band and block brake, the ratio of tensions on tight side and slack side of the band is (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks)

A. T₁/T₂ = μ. θ. n

B. T₁/T₂ = [(1 - μ tanθ)/(1 + μ tanθ)]n

C. T₁/T₂ = (μ θ)n

D. T₁/T₂ = [(1 + μ tanθ)/(1 - μ tanθ)]n

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4

Which type of gearing is used in steering system of an automobile?

A. Rack and pinion

B. Worm and wheel

C. Spiral gears

D. None of the above

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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

The velocity of the belt for maximum power is (where m = Mass of the belt in kg per metre length)

A. T/3

B. (T.g)/3

C. √(T/3m)

D. √(3m/T)

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4

Flexible coupling is used because

A. It is easy to disassemble

B. It is easy to engage and disengage

C. It transmits shocks gradually

D. It prevents shock transmission and eliminates stress reversals

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4

Shaft revolving in a bearing is the following type of pair

A. Lower pair

B. Higher pair

C. Spherical pair

D. Cylindrical pair

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4

Which of the following statement is wrong?

A. A round bar in a round hole form a turning pair

B. A square bar in a square hole form a sliding pair

C. A vertical shaft in a foot step bearing forms a successful constraint

D. All of the above

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4

The component of the acceleration, perpendicular to the velocity of the particle, at the given instant is called

A. Radial component

B. Tangential component

C. Coriolis component

D. None of these

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4

The inversion of a mechanism is

A. Changing of a higher pair to a lower pair

B. Turning its upside down

C. Obtained by fixing different links in a kinematic chain

D. Obtained by reversing the input and output motion

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4

In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, this method will

A. Cause withdrawing or throttling of steam

B. Reduce length of effective stroke of piston

C. Reduce maximum opening of port to steam

D. All of these

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4

Which one of the following can completely balance several masses revolving in different planes on a shaft?

A. A single mass in different planes

B. Two masses in any two planes

C. A single mass in one of the planes of the revolving masses

D. Two equal masses in any two planes

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4

The frictional torque transmitted by a disc or plate clutch is same as that of

A. Flat pivot bearing

B. Flat collar bearing

C. Conical pivot bearing

D. Truncated conical pivot bearing

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4

In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links

A. Will remain same

B. Will change

C. Could change or remain unaltered depending on which link is fixed

D. Will not occur

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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

The maximum efficiency of spiral gears is (where θ = Shaft angle, and φ = Friction angle)

A. sin (θ + φ) + 1/ cos (θ - φ) + 1

B. cos (θ - φ) + 1/ sin (θ + φ) + 1

C. cos (θ + φ) + 1/ cos (θ - φ) + 1

D. cos (θ - φ) + 1/ cos (θ + φ) + 1

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4

The acceleration of the particle moving with simple harmonic motion is _________ at the mean position.

A. Zero

B. Minimum

C. Maximum

D. None of these

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4

Peaucelliers mechanism has

A. Eight links

B. Six links

C. Four links

D. Twelve links