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What is the correct answer?

4

The contact ratio for gears is

A. Zero

B. Less than one

C. Greater than one

D. Infinity

Correct Answer :

C. Greater than one


Related Questions

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4

The transmissibility, for all values of damping factor, will be less than unity, if ω/ωn is

A. Equal to 1

B. Less than 2

C. Equal to 2

D. Greater than 2

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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

Oldhams coupling is an inversion of the kinematic chain used in

A. Whitworth quick return mechanism

B. Elliptical trammels

C. Rotary engine

D. Universal joint

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4

One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where δ = Deflection of the spring)

A. 2π. √(g/δ)

B. 1/2π. √(g/δ)

C. 2π. √(δ/g)

D. 1/2π. √(δ/g)

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4

The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to

A. 0° and 90°

B. 90° and 180°

C. 135° and 315°

D. 270° and 360°

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4

If D₁ and D₂ be the diameters of driver and driven pulleys, then belt speed is proportional to

A. D₁/D₂

B. D₂/D₁

C. D₁.D₂

D. D₁

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4

In a steam engine, the distance by which the outer edge of the Dslide valve overlaps the steam port is called

A. Lead

B. Steam lap

C. Exhaust lap

D. None of these

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4

The two parallel and coplanar shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is known as

A. Spur gearing

B. Helical gearing

C. Bevel gearing

D. Spiral gearing

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4

The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as

A. Damping factor

B. Damping coefficient

C. Logarithmic decrement

D. Magnification factor

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4

In a shaper mechanism, the Coriolis component of acceleration will

A. Not exist

B. Exist

C. Depend on position of crank

D. None of the above

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4

The sense of coriolis component 2 ωv is same as that of the relative velocity vector v rotated at

A. 45° in the direction of rotation of the link containing the path

B. 45° in the direction opposite to the rotation of the link containing the path

C. 90° in the direction of rotation of the link containing the path

D. 180° in the direction opposite to the rotation of the link containing the path

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4

Which of the following is a turning pair?

A. Piston and cylinder of a reciprocating steam engine

B. Shaft with collars at both ends fitted into a circular hole

C. Lead screw of a lathe with nut

D. Ball and a socket joint

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4

When the sleeve of a Porter governor moves downwards, the governor speed

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases

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4

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

A. Oldham's coupling

B. Elliptical trammel

C. Scotch yoke mechanism

D. All of these

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4

The maximum fluctuation of energy is the

A. Difference between the maximum and minimum energies

B. Sum of the maximum and minimum energies

C. Variations of energy above and below the mean resisting torque line

D. Ratio of the mean resisting torque to the workdone per cycle

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4

In higher pair, the relative motion is

A. Purely turning

B. Purely sliding

C. Purely rotary

D. Combination of sliding and turning

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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

A governor is said to be stable, if the

A. Radius of rotation of balls increases as the equilibrium speed decreases

B. Radius of rotation of balls decreases as the equilibrium speed decreases

C. Radius of rotation of balls increases as the equilibrium speed increases

D. Radius of rotation of balls decreases as the equilibrium speed increases

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4

Whitworth quick return mechanism is obtained by inversion of

A. Slider crank mechanism

B. Kinematic chain

C. Five link mechanism

D. Roller cam mechanism

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4

The Coriolis component of acceleration acts

A. Along the sliding surface

B. Perpendicular to the sliding surface

C. At 45° to the sliding surface

D. Parallel to the sliding surface

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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

The relation between number of links (l) and number of joints (j) in a kinematic chain is

A. l = (1/2).(j + 2)

B. l = (2/3).(j + 2)

C. l = (3/4).(j + 3)

D. l = j + 4

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4

In full depth involute system, the smallest number of teeth in a pinion which meshes with rack without interference is

A. 12

B. 16

C. 25

D. 32

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4

The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the

A. Unbalanced couples are caused only at higher speeds

B. Unbalanced forces are not dangerous at higher speeds

C. Effects of unbalances are proportional to the square of the speed

D. Effects of unbalances are directly proportional to the speed

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4

A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by

A. 2 W CE / CS

B. W CE / 2CS

C. W CE / CS

D. W CS / 2CE

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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

A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the

A. Magnitude of the forces on journal

B. Angular velocity of journal

C. Clearance between journal and bearing

D. Radius of journal

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4

Tangential acceleration direction is

A. Along the angular velocity

B. Opposite to angular velocity

C. May be any one of these

D. Perpendicular to angular velocity

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4

Angle of descent 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 the 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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4

The velocity of a body moving with simple harmonic motion is __________ at the mean position.

A. Zero

B. Minimum

C. Maximum

D. None of these