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4

The amplitude of vibration is always __________ the radius of the circle.

A. Equal to

B. Less than

C. Greater than

D. None of these

Correct Answer :

A. Equal to


Related Questions

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4

If the damping factor for a vibrating system is unity, then the system will be

A. Over damped

B. Under damped

C. Critically damped

D. Without vibrations

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4

In order to double the period of a simple pendulum, the length of the string should be

A. Halved

B. Doubled

C. Quadrupled

D. None of these

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4

An exact straight line motion mechanism is a

A. Scott-Russell's mechanism

B. Hart's mechanism

C. Peaucellier's mechanism

D. All of these

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4

Sense of tangential acceleration of a link

A. Is same as that of velocity

B. Is opposite to that of velocity

C. Could be either same or opposite to velocity

D. Is perpendicular to that of velocity

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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

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4

The direction of linear velocity of any point on a link with respect to another point on the same link is

A. Parallel to the link joining the points

B. Perpendicular to the link joining the points

C. At 45° to the link joining the points

D. None of the above

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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 this equation are real, then the system will be

A. Over-damped

B. Under damped

C. Critically damped

D. Without vibrations

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4

A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, men due to centrifugal forc

A. The reaction on me inner wheels increases and on the outer wheels decreases

B. The reaction on the outer wheels increases and on the inner wheels decreases

C. The reaction on the front wheels increases and on the rear wheels decreases

D. The reaction on the rear wheels increases and on the front wheels decreases

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4

Angular acceleration of a link can be determined by dividing the

A. Centripetal component of acceleration with length of link

B. Tangential component of acceleration with length of link

C. Resultant acceleration with length of link

D. All of the above

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4

The amplitude of vibration is always __________ the radius of the circle.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable.

A. Remains constant

B. Decreases

C. Increases

D. None of these

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4

In a pantograph, all the pairs are

A. Turning pairs

B. Sliding pairs

C. Spherical pairs

D. Self-closed pairs

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4

In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to

A. 0.2

B. 0.4

C. 0.6

D. 0.8

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4

In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if ω/ωn is

A. Equal to 1

B. Equal to 2

C. Less than 2

D. Greater than 2

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4

In a screw jack, the effort required to lower the load W is given by

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

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

To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use?

A. Spur gear

B. Spiral gear

C. Bevel gear

D. Worm gear

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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

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

The frictional torque transmitted in a flat collar bearing, considering uniform pressure, 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

The Bifilar suspension method is used to determine

A. Natural frequency of vibration

B. Position of balancing weights

C. Moment of inertia

D. Centripetal acceleration

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4

The instantaneous centre of a rigid thin disc rolling on a plane rigid surface is located at

A. The centre of the disc

B. The point of contact

C. An infinite distance on the plane surface

D. The point on the circumference situated vertically opposite to the contact point

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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 swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to

A. 90° and 180°

B. 45° and 225°

C. 180° and 270°

D. 270° and 360°

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4

Power of a governor is the

A. Mean force exerted at the sleeve for a given percentage change of speed

B. Workdone at the sleeve for maximum equilibrium speed

C. Mean force exerted at the sleeve for maximum equilibrium speed

D. None of the above

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4

The minimum force required to slide a body of weight W on a rough horizontal plane is

A. W sinθ

B. W cosθ

C. W tanθ

D. W cosecθ

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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 simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

A. fn/2

B. 2 fn

C. 4 fn

D. 8 fn

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4

A system in dynamic balance implies that

A. The system is critically damped

B. There is no critical speed in the system

C. The system is also statically balanced

D. There will absolutely no wear of bearings

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4

The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in

A. A single plane

B. Two planes

C. Three planes

D. Four planes