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4

In a turning moment diagram, the variations of energy above and below the mean resisting torque line is called

A. Fluctuation of energy

B. Maximum fluctuation of energy

C. Coefficient of fluctuation of energy

D. None of these

Correct Answer :

A. Fluctuation of energy


Related Questions

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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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When the two elements of a pair have __________ when in motion, it is said to a lower pair.

A. Line or point contact

B. Surface contact

C. Body contact

D. None of these

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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

Angle of ascent of cam is defined as the angle

A. During which the follower returns to its initial position

B. Of rotation of the cam for a definite displacement of the follower

C. Through which the cam rotates during the period in which the follower remains in highest position

D. Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

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Which of the following is a higher pair?

A. Turning pair

B. Screw pair

C. Belt and pulley

D. None of the above

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4

A universal joint is an example of

A. Higher pair

B. Lower pair

C. Rolling pair

D. Sliding pair

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The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead centre, and n = Ratio of length of connecting rod to the radius of crank)

A. ωr [sin θ + (sin 2θ/n)]

B. ωr [cos θ + (cos 2θ/n)]

C. ω²r [sin θ + (sin 2θ/n)]

D. ω²r [cos θ + (cos 2θ/n)]

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4

The cam and follower is an example of

A. Sliding pair

B. Rolling pair

C. Lower pair

D. Higher pair

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4

For the brake to be self locking, the force P at C shown in the below figure, should

A. Be zero

B. Act in upward direction

C. Act in downward direction

D. None of these

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4

Higher 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

A mechanism consisting of four links is called a __________ mechanism.

A. Simple

B. Compound

C. Binary

D. None of these

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The maximum velocity of a particle moving with simple harmonic motion is

A. ω

B. ωr

C. ω²r

D. ω/r

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The maximum fluctuation of speed is the

A. Difference of minimum fluctuation of speed and the mean speed

B. Difference of the maximum and minimum speeds

C. Sum of maximum and minimum speeds

D. Variations of speed above and below the mean resisting torque line

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4

The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

A. (1/2) μ W R

B. (2/3) μ W R

C. (3/4) μ W R

D. μ W R

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4

In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines,

A. The algebraic sum of the primary forces must be equal to zero

B. The algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero

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 maximum or minimum value of the swaying couple is

A. ± c.m.ω².r

B. ± a (1 - c) m.ω².r

C. ± (a/√2) (1 - c) m.ω².r

D. ± 2a (1 - c) m.ω².r

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4

Which type of gear train is used in clock mechanism to join hour hand and minute hand?

A. Simple gear train

B. Compound gear train

C. Reverted gear train

D. Epicyclic gear train

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4

In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from

A. 50°-60°

B. 60°-70°

C. 70°-80°

D. 80°-90°

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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

The flank of the tooth is the surface of the tooth __________ the pitch surface.

A. Above

B. Below

C. At

D. None of these

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The driving and driven shafts connected by a Hooke's joint will have equal speeds, if

A. cosθ = sinα

B. sinθ = ± tanα

C. tanθ = ± cosα

D. cotθ = cosα

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4

Efficiency of a screw jack is given by

A. tan (α + φ)/tanα

B. tanα/tan (α +φ)

C. tan (α - φ)/tanα

D. tanα/tan (α - φ)

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4

A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is

A. ωv

B. 2ωv

C. ω²v

D. 2ωv²

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The lower pairs are __________ pairs.

A. Self-closed

B. Force-closed

C. Friction closed

D. None of these

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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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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 mechanism in which two are turning pairs and two are sliding pairs, is called a

A. Double slider crank chain

B. Elliptical trammel

C. Scotch yoke mechanism

D. All of these

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4

The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft, and α = Semi-angle of the cone)

A. (1/2) μ W R cosecα

B. (2/3) μ W R cosecα

C. (3/4) μ W R cosecα

D. μ W R cosecα

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4

Whirling speed of the shaft is the speed at which

A. Shaft tends to vibrate in longitudinal direction

B. Torsional vibrations occur

C. Shaft tends to vibrate vigorously in transverse direction

D. Combination of transverse and longitudinal vibration occurs