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What is the correct answer?

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

Correct Answer :

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


Related Questions

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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

When two links are connected by a pin joint, their instantaneous centre lies

A. On their point of contact

B. At the centre of curvature

C. At the centre of circle

D. At the pin joint

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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

In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is

A. 95 mm

B. Slightly less than 95 mm

C. Slightly more than 95 mm

D. 45 mm

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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

What is the correct answer?

4

The velocity of a particle moving with simple harmonic motion, at any instant is given by (where ω = Displacement of the particle from mean position)

A. ω √(x² - r²)

B. ω √(r² - x²)

C. ω² √(x² - r²)

D. ω² √(r² - x²)

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4

The Ackermann steering mechanism is preferred to the Davis type in automobiles because

A. The former is mathematically accurate

B. The former is having turning pair

C. The former is most economical

D. The former is most rigid

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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

In the two rotor system as shown in the below figure (I₁ < I₂), a node of vibration is situated

A. Between I₁, and I₂ but nearer I₁

B. Between I₁, and I₂ but nearer to I₂

C. Exactly in the middle of the shaft

D. Nearer to I₁ but outside

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4

Which of the following has sliding motion?

A. Crank

B. Connecting rod

C. Crank pin

D. Crosshead

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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

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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4

Klein's construction can be used to determine acceleration of various parts when the crank is at

A. Inner dead centre

B. Outer dead centre

C. Right angles to the link of the stroke

D. All of the above

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4

For an isochronous Hartnell governor (where r₁ and r₂ = Maximum and minimum radius of rotation of balls respectively, S₁ and S₂ = Maximum and minimum force exerted on the sleeve respectively, and M = Mass on the sleeve)

A. (m.g + S₁)/(m.g + S₂) = r₁/r₂

B. (m.g - S₁)/(m.g - S₂) = r₂/r₁

C. S₁/S₂ = r₁/r₂

D. S₂/S₁ = r₁/r₂

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4

A spring controlled governor is said to be unstable when the controlling force

A. Increases as the radius of rotation decreases

B. Increases as the radius of rotation increases

C. Decreases as the radius of rotation increases

D. Remains constant for all radii of rotation

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4

The distance by which the __________ of the D-slide valve overlaps the steam port is called exhaust lap.

A. Inner edge

B. Outer edge

C. Corners

D. None of these

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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

The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft, and I = Mass moment of inertia of the disc attached at the end of a shaft)

A. 2π. √(q/I)

B. 2π qI

C. (1/2π). √(q/I)

D. 1/2π

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4

When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a

A. Lower pair

B. Higher pair

C. Self-closed pair

D. Force-closed pair

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4

Which of the following is an example of a higher pair?

A. Toothed gearing

B. Belt and rope drive

C. Ball and roller bearing

D. All of these

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4

The velocity of the rubbing surface __________ with the distance from the axis of the bearing.

A. Increases

B. Decreases

C. Remain same

D. None of these

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4

Frequency of vibrations is usually expressed in

A. Number of cycles per hour

B. Number of cycles per minute

C. Number of cycles per second

D. None of these

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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

The sense of Coriolis component is such that it

A. Leads the sliding velocity vector by 90°

B. Lags the sliding velocity vector by 90°

C. Is along the sliding velocity vector

D. Leads the sliding velocity vector by 180°

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4

The coefficient of fluctuation of speed is __________ of maximum fluctuation of speed and the mean speed.

A. Sum

B. Difference

C. Product

D. Ratio

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4

The critical speed of a shaft depends upon its

A. Mass

B. Stiffness

C. Mass and stiffness

D. Stiffness and eccentricity

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4

Which of the following statements regarding laws governing the friction between dry surfaces are correct?

A. The friction force is dependent on the materials of the contact surfaces.

B. The friction force is directly proportional to the normal force.

C. The friction force is independent of me area of contact.

D. All of the above

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4

The Klein's method of construction for reciprocating engine mechanism

A. Is a simplified version of instantaneous centre method

B. Utilises a quadrilateral similar to the diagram of mechanism for reciprocating engine

C. Enables determination of coriolis component

D. Is based on the acceleration diagram

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4

In involute gears, the pressure angle is

A. Dependent on the size of teeth

B. Dependent on the size of gears

C. Always constant

D. Always variable

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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)