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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

Correct Answer :

C. The system is also statically balanced


Related Questions

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A spring controlled governor is found unstable. It can be made stable by

A. Increasing the spring stiffness

B. Decreasing the spring stiffness

C. Increasing the ball mass

D. Decreasing the ball mass

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4

The purpose of a link is to

A. Transmit motion

B. Guide other links

C. Act as a support

D. All of the above

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According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centres will lie on a

A. Straight line

B. Parabolic curve

C. Triangle

D. Rectangle

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The example of spherical 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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The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in

A. Transverse vibrations

B. Torsional vibrations

C. Longitudinal vibrations

D. All of these

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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 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

An automobile steering gear is an example of

A. Sliding pair

B. Rolling pair

C. Lower pair

D. Higher pair

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The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)

A. n = 3(l - 1) - 2j - h

B. n = 2(l - 1) -2j - h

C. n = 3(l - 1) - 3j - h

D. n = 2(l - 1) - 3j - h

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4

In railway axle boxes, the bearing used is

A. Deep groove ball bearing

B. Double row self aligning ball bearing

C. Double row spherical roller bearing

D. Cylindrical roller bearing

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4

The axis of precession is __________ to the plane in which the axis of spin is going to rotate.

A. Parallel

B. Perpendicular

C. Both A and B

D. None of these

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4

The advantage of the piston valve over the slide valve is that in the former case

A. Wear is less

B. Power absorbed is less

C. Both wear and power absorbed are low

D. The pressure developed being high provides tight sealing

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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

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

A. Minimum

B. Zero

C. Maximum

D. None of these

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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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The ratio of maximum fluctuation of speed to the mean speed is called

A. Fluctuation of speed

B. Maximum fluctuation of speed

C. Coefficient of fluctuation of speed

D. None of these

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Governor is used in automobile to

A. Decrease the variation of speed

B. Maximize the fuel economy

C. Limit the vehicle speed

D. Maintain constant engine speed

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A watt's governor can work satisfactorily at speeds from

A. 60 to 80 r.p.m.

B. 80 to 100 r.p.m.

C. 100 to 200 r.p.m.

D. 200 to 300 r.p.m.

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A rigid body possesses ________degrees of freedom

A. One

B. Two

C. Four

D. Six

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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

Open 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 point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The radial component of the acceleration of B with respect to A, is (where vBA = Linear velocity of B with respect to A)

A. vBA × AB

B. vBA /AB

C. BA

D. BA /AB

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4

The included angle for the V-belt is usually

A. 10° to 20°

B. 20° to 30°

C. 30° to 40°

D. 60° to 80°

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The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

A. 12

B. 14

C. 18

D. 24

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4

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

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases

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The total number of instantaneous centres for a mechanism consisting of n links are

A. n/2

B. n

C. n - 1

D. n(n - 1)/2

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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

In considering friction of a V-thread, the virtual coefficient of friction (μ₁) is given by

A. μ₁ = μ sinβ

B. μ₁ = μ cosβ

C. μ₁ = μ/sinβ

D. μ₁ = μ/cosβ

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4

An eccentric sheave pivoted at one point rotates and transmits oscillatory motion to a link whose one end is pivoted and other end is connected to it. This mechanism has

A. 2 links

B. 3 links

C. 4 links

D. 5 links

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When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in __________ directions.

A. Same

B. Opposite

C. Perpendicular

D. None of these