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4

The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)

A. l₁ = kG

B. l₂ = kG

C. l₁l₂ = kG

D. l₁l₂ = kG²

Correct Answer :

D. l₁l₂ = kG²


Related Questions

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4

When the load on the engine increases, it becomes necessary to increase the supply of working fluid and when the load decreases, less working fluid is required. The supply of the working fluid to the engine is controlled by a

A. D-slide valve

B. Governor

C. Meyer's expansion valve

D. Flywheel

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4

When the body is suspended at the point of suspension, its periodic time and frequency will be ________ as compared to the body suspended at the point of percussion.

A. Same

B. Two times

C. Four times

D. None of these

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4

Pulley in a belt drive acts as

A. Cylindrical pair

B. Turning pair

C. Rolling pair

D. Sliding pair

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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

When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

A. To move the ship towards starboard

B. To move the ship towards port side

C. To raise the bow and lower the stern

D. To raise the stern and lower the bow

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4

The centre of percussion is below the centre of gravity of the body and is at a distance equal to

A. h/kG

B. h²/kG

C. kG²/h

D. h × kG

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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

The static friction

A. Bears a constant ratio to the normal reaction between the two surfaces

B. Is independent of the area of contact, between the two surfaces

C. Always acts in a direction, opposite to that in which the body tends to move

D. All of the above

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4

The relation between number of pairs (p) forming a kinematic chain and the number of links (l) is

A. l = 2p - 2

B. l = 2p - 3

C. l = 2p - 4

D. l = 2p - 5

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4

For high speed engines, the cam follower should move with

A. Uniform velocity

B. Simple harmonic motion

C. Uniform acceleration and retardation

D. Cycloidal motion

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4

In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will

A. Cause withdrawing or throttling of steam

B. Reduce length of effective stroke of piston

C. Reduce maximum opening of port to steam

D. All of these

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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

Which of the following statement is correct?

A. For constant velocity ratio transmission between two gears, the common normal at the point of contact must always pass through a fixed point on the line joining the centres of rotation of gears.

B. For involute gears, the pressure angle changes with the change in centre distance between gears.

C. The epicyclic gear trains involve rotation of atleast one gear axis about some other gear axis.

D. All of the above

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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 kinematic chain requires at least

A. 2 links and 3 turning pairs

B. 3 links and 4 turning pairs

C. 4 links and 4 turning pairs

D. 5 links and 4 turning pairs

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4

When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

A. Lower pair

B. Higher pair

C. Self-closed pair

D. Force-closed pair

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4

The frictional torque transmitted by a cone clutch is same as that of

A. Flat pivot bearing

B. Flat collar bearing

C. Conical pivot bearing

D. Truncated conical pivot bearing

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4

The maximum efficiency of a screw jack is

A. (1 - sinφ)/(1 + sinφ)

B. (1 + sinφ)/(1 - sinφ)

C. (1 - tanφ)/(1 + tanφ)

D. (1 + tanφ)/(1 - tanφ)

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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 reciprocating steam engine, which of the following forms a kinematic link?

A. Cylinder and piston

B. Piston rod and connecting rod

C. Crankshaft and flywheel

D. Flywheel and engine frame

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4

The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as

A. Static friction

B. Dynamic friction

C. Limiting friction

D. Coefficient of friction

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4

If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be

A. Four times the first one

B. Same as the first one

C. One fourth of the first one

D. One and a half times the first one

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4

The tendency of a body to resist change from rest or motion is known as

A. Mass

B. Friction

C. Inertia

D. Resisting force

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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 condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical)

A. sinα = b/c

B. cosα = c/b

C. tanα = c/2b

D. cotα = c/2b

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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 coriolis component of acceleration exists whenever a point moves along a path that has

A. Linear displacement

B. Rotational motion

C. Gravitational acceleration

D. Tangential acceleration

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4

A combination of kinematic pairs, joined in such a way that the relative motion between the links is completely constrained, is called a

A. Structure

B. Mechanism

C. Kinematic chain

D. Inversion

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4

The D-slide valve is also known as

A. Inside admission valve

B. Outside admission valve

C. Piston slide valve

D. None of these

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4

When one of the links of a kinematic chain is fixed, the chain is known as a

A. Structure

B. Mechanism

C. Inversion

D. Machine