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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

Correct Answer :

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


Related Questions

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If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

A.

B. 90°

C. 180°

D. 360°

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4

The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction)

A. α = 45° + φ/2

B. α = 45° - φ/2

C. α = 90° + φ

D. α = 90° - φ

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3.The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)

A. ω² × OQ

B. ω² × OQ sinθ

C. ω² × OQ cosθ

D. ω² × OQ tanθ

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4

The minimum periodic time of a compound pendulum is

A. (1/2π). √(kG/g)

B. (1/2π). √(2kG/g)

C. 2π. √(kG/g)

D. 2π. √(2kG/g)

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4

In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be

A. Less sensitive

B. More sensitive

C. Unaffected of sensitivity

D. Isochronous

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4

When a body is subjected to transverse vibrations, the stress induced in a body will be

A. Shear stress

B. Bending stress

C. Tensile stress

D. Compressive stress

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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

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4

The included angle for the V-belt is usually

A. 10° to 20°

B. 20° to 30°

C. 30° to 40°

D. 60° to 80°

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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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In an ideal machine, the output as compared to input is

A. Less

B. More

C. Equal

D. May be less or more depending on efficiency

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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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A kinematic chain requires at least

A. 2 links and 3 turning pairs

B. 3 links and 4 turning pairs

C. 4 links and 4 turning pairs

D. 5 links and 4 turning pairs

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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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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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The partial balancing of reciprocating parts in locomotives produces

A. Hammer blow

B. Swaying couple

C. Variation in tractive force along the line of stroke

D. All of the above

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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

A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard?

A. All points of the disc have the same velocity

B. The centre of the disc has zero acceleration

C. The centre of the disc has centrifugal acceleration

D. The point on the disc making contact with the plane surface has zero acceleration

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4

In a mechanism, the fixed instantaneous centres are those centres which

A. Remain in the same place for all configurations of the mechanism

B. Vary with the configuration of the mechanism

C. Moves as the mechanism moves, but joints are of permanent nature

D. None of the above

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Any point on a link connecting double slider crank chain will trace a

A. Straight line

B. Circle

C. Ellipse

D. Parabola

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Which of the following statement is correct for gears?

A. The addendum is less than the dedendum

B. The pitch circle diameter is the product of module and number of teeth

C. The contact ratio means the number of pairs of teeth in contact

D. All of the above

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4

The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be

A. To raise the bow and stern

B. To lower the bow and stern

C. To raise the bow and lower the stern

D. To raise the stern and lower the bow

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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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The total number of instantaneous centres for a mechanism consisting of n links are

A. n/2

B. n

C. n - 1

D. n(n - 1)/2

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4

The following is the inversion of slider crank chain mechanism

A. Whitworth quick return mechanism

B. Hand pump

C. Oscillating cylinder engine

D. All of the above

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The coriolis component of acceleration exists whenever a point moves along a path that has

A. Linear displacement

B. Rotational motion

C. Gravitational acceleration

D. Tangential acceleration

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Inertia force acts

A. Perpendicular to the acceleration force

B. Along the direction of acceleration force

C. Opposite to the direction of acceleration force

D. None of the above

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The arrangement is called bevel gearing, when two __________ are connected by gears.

A. Intersecting and coplanar shafts

B. Nonintersecting and non-coplanar shafts

C. Parallel and coplanar shafts

D. Parallel and non-coplanar shafts

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Kinematic 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 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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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