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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

Correct Answer :

A. Inner edge


Related Questions

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4

In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

A. Because of difficulty in manufacturing cam profile

B. Because of loose contact of follower with cam surface

C. In order to have acceleration in beginning and retardation at the end of stroke within the finite limits

D. Because the uniform velocity motion is a partial parabolic motion

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4

The train value of a gear train is

A. Equal to velocity ratio of a gear train

B. Reciprocal of velocity ratio of a gear train

C. Always greater than unity

D. Always less than unity

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4

In a multiple V-belt drive, if one of the belts is broken, then we should replace

A. The broken belt only

B. All the belts

C. The broken belt and the belts on either side of it

D. None of the above

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4

The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

A. 0° and 90°

B. 180° and 360°

C. Both (A) and (B)

D. None of these

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4

For simple harmonic motion of the of follower, a cosine curve represents

A. Displacement diagram

B. Velocity diagram

C. Acceleration diagram

D. All of the above

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4

The velocity of sliding __________ the distance of the point of contact from the pitch point.

A. Is directly proportional to

B. Is inversely proportional to

C. Is equal to cos φ multiplied by

D. Does not depend upon

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4

The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m).(dx/dt) + (s/m).x = 0, if the roots of the equation are __________ then the system will be under damped.

A. Equal

B. Real

C. Complex conjugate

D. None of these

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4

Length of arc of contact is given by

A. Arc of approach - Arc of recess

B. Arc of approach + Arc of recess

C. Arc of approach / Arc of recess

D. Arc of approach × Arc of recess

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4

In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient.

A. Equal to

B. Directly proportional to

C. Inversely proportional to

D. Independent of

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4

The example of successfully constrained motion is a

A. Motion of an I.C. engine valve

B. Motion of the shaft between a footstep bearing

C. Piston reciprocating inside an engine cylinder

D. All of the above

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4

The secondary unbalanced force is __________ the primary unbalanced force.

A. One-half

B. Two-third

C. n times

D. 1/n times

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4

The example of lower pair is

A. Shaft revolving in a bearing

B. Straight line motion mechanisms

C. Automobile steering gear

D. All of the above

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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 magnitude of linear velocity of a point B on a link AB relative to point A is (Where ω = Angular velocity of the link AB)

A. ω × AB

B. ω × (AB)²

C. ω² × AB

D. (ω × AB)²

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4

A mechanism is an assemblage of

A. Two links

B. Three links

C. Four or more than four links

D. All of these

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4

The fundamental equation for correct steering is (where φ and α = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles, and d = Wheel base)

A. sinφ + sinα = b/c

B. cosφ - sinα = c/b

C. cotφ - cotα = c/b

D. tanφ + cotα = b/c

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4

In gears, interference takes place when

A. The tip of a tooth of a mating gear digs into the portion between base and root circles

B. Gears do not move smoothly in the absence of lubrication

C. Pitch of the gears is not same

D. Gear teeth are undercut

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4

The sense of Coriolis component is such that it

A. Leads the sliding velocity vector by 90°

B. Lags the sliding velocity vector by 90°

C. Is along the sliding velocity vector

D. Leads the sliding velocity vector by 180°

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4

In a four stroke I.C. engine, the turning moment during the compression stroke is

A. Positive throughout

B. Negative throughout

C. Positive during major portion of the stroke

D. Negative during major portion of the stroke

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4

The frictional torque transmitted in a flat collar bearing, considering uniform wear, is (where r₁ and r₂ = External and internal radii of collar respectively)

A. (1/2) μ W (r₁ + r₂)

B. (2/3) μ W (r₁ + r₂)

C. (1/2) μ W [(r₁³ - r₂³)/(r₁² - r₂²)]

D. (2/3) μ W [(r₁³ - r₂³)/(r₁² - r₂²)]

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4

When the crank is at the inner dead centre, in a reciprocating steam engine, then the acceleration of the piston will be

A. ω²r. (n + 1)/n

B. ω²r. (n - 1)/n

C. ω²r. n/(n + 1)

D. ω²r. n/(n - 1)

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4

The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is

A. (1/2) μ W R cosec α

B. (2/3) μ W R cosec α

C. (3/4) μ W R cosec α

D. μ W R cosec α

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4

The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be

A. To dip the nose and tail

B. To raise the nose and tail

C. To raise the nose and dip the tail

D. To dip the nose and raise the tail

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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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4

A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is

A. 2

B. 4

C. 3

D. None of the above

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4

The example of rolling pair is

A. Bolt and nut

B. Lead screw of a lathe

C. Ball and socket joint

D. Ball bearing and roller bearing

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4

The secondary 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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4

The natural frequency of free transverse vibrations due to a point load acting over a simply supported shaft is equal to (where δ = Static deflection of a simply supported shaft due to the point load)

A. 0.4985/√δ

B. 0.5615/√δ

C. 0.571/√δ

D. 0.6253/√δ

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4

When the nature of contact between the elements of a pair is such that it can only slide relative to the other, the pair is known as a

A. Screw pair

B. Spherical pair

C. Turning pair

D. Sliding pair

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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