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4

The effort of a Porter governor is equal to (where c = Percentage increase in speed, m = Mass of ball, and M = Mass on the sleeve)

A. c (m - M) g

B. c (m + M) g

C. c/(m + M) g

D. c/(m - M) g

Correct Answer :

B. c (m + M) g


Related Questions

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4

In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, if N coincides with O, then

A. Acceleration and velocity of the piston P is zero

B. Acceleration and velocity of the piston P is maximum

C. Acceleration of the piston P is zero and its velocity is maximum

D. Acceleration of the piston P is maximum and its velocity is zero

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4

Which of the following is an inversion of Single slider crank chain?

A. Beam engine

B. Rotary engine

C. Oldhams coupling

D. Elliptical trammel

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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

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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4

The cam follower generally used in aircraft engines is

A. Knife edge follower

B. Flat faced follower

C. Spherical faced follower

D. Roller follower

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4

When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

A. Free vibration

B. Forced vibration

C. Damped vibration

D. Under damped vibration

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4

A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if

A. The sum of the two masses is equal to the total mass of body

B. The centre of gravity of the two masses coincides with that of the body

C. The sum of mass moment of inertia of the masses about their centre of gravity is equal to the mass moment of inertia of the body

D. All of the above

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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

Creep in belt drive is due to

A. Weak material of the belt

B. Weak material of the pulley

C. Uneven extensions and contractions of the belt when it passes from tight side to slack side

D. Expansion of the belt

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4

Scotch yoke mechanism is used to generate

A. Sine functions

B. Square roots

C. Logarithms

D. Inversions

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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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4

In automobiles the power is transmitted from gear box to differential through

A. Bevel gear

B. Universal joint

C. Hooke's joint

D. Knuckle joint

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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 a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to

A. Reduce vibration

B. Reduce slip

C. Ensure uniform loading

D. Ensure proper alignment

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4

The centrifugal tension in belts

A. Increases power transmitted

B. Decreases power transmitted

C. Have no effect on power transmitted

D. Increases power transmitted upto a certain speed and then decreases

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4

In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)

A. P = W tan(α - φ)

B. P = W tan(α + φ)

C. P = W tan(φ - α)

D. P = W cos(α + φ)

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4

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 factor which affects the critical speed of a shaft is

A. Diameter of disc

B. Span of shaft

C. Eccentricity

D. All 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

When brakes are applied to all the four wheels of a moving car, the distance travelled by the car before it is brought to rest, will be

A. Maximum

B. Minimum

C. Zero

D. None of these

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4

Relationship between the number of links (L) and number of pairs (P) is

A. P = 2L - 4

B. P = 2L + 4

C. P = 2L + 2

D. P = 2L - 2

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4

For the same lift and same angle of ascent, a smaller base circle will give

A. A small value of pressure angle

B. A large value of pressure angle

C. There is no such relation with pressure angle

D. Something else

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4

The frequency of oscillation at compared to earth will be

A. 6 times more

B. 6 times less

C. 2.44 times more

D. 2.44 times less

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4

The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

A. ω (r₁ r₂) sinθ

B. ω (r₁ + r₂) sinθ sec2θ

C. ω (r₁ r₂) cosθ

D. ω (r₁ + r₂) cosθ cosec2θ

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4

The Whitworth quick return motion mechanism is formed in a slider crank chain when the

A. Coupler link is fixed

B. Longest link is a fixed link

C. Slider is a fixed link

D. Smallest link is a fixed link

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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 Hooke's joint consists of:

A. Two forks

B. One fork

C. Three forks

D. Four forks

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4

In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is Constant, then

A. Open belt drive is recommended

B. Crossed belt drive is recommended

C. Both open belt drive and crossed belt drive is recommended

D. The drive is recommended depending upon the torque transmitted

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4

Which of the following statement is correct?

A. The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation.

B. The periodic time of a particle moving with simple harmonic motion is directly proportional to its angular velocity.

C. The velocity of a particle moving with simple harmonic motion is zero at the mean position.

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

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4

When the belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the

A. Tension in the tight side of the belt

B. Tension in the slack side of the belt

C. Sum of the tensions on the tight side and slack side of the belt

D. Average tension of the tight side and slack side of the belt