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4

If the opposite links of a four bar linkage are equal, the links will always form a

A. Triangle

B. Rectangle

C. Parallelogram

D. Pentagon

Correct Answer :

C. Parallelogram


Related Questions

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4

Length of arc of contact is given by

A. Arc of approach - Arc of recess

B. Arc of approach + Arc of recess

C. Arc of approach / Arc of recess

D. Arc of approach × Arc of recess

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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

The Grubler's criterion for determining the degrees of freedom (n) of a mechanism having plane motion is (where l = Number of links, and j = Number of binary joints)

A. n = (l -1) - j

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

C. n = 3(l - 1) - 2j

D. n = 4(l - 1) - 3j

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4

A slider crank chain consists of following numbers of turning and sliding pairs

A. 1, 3

B. 2, 2

C. 3, 1

D. 4, 0

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4

For fluctuating loads, well suited bearing is

A. Ball bearing

B. Roller bearing

C. Needle roller bearing

D. Thrust bearing

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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

Whirling speed of the shaft is the speed at which

A. Shaft tends to vibrate in longitudinal direction

B. Torsional vibrations occur

C. Shaft tends to vibrate vigorously in transverse direction

D. Combination of transverse and longitudinal vibration occurs

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4

In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces will be

A. n₁ + n₂

B. n₁ + n₂ + 1

C. n₁ + n₂ - 1

D. n₁ + n₂ - 2

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4

When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will

A. Return to equilibrium position without oscillation

B. Oscillate with increasing time period

C. Oscillate with decreasing amplitude

D. Oscillate with constant amplitude

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4

A completely constrained motion can be transmitted with.

A. 1 link with pin joints

B. 2 links with pin joints

C. 3 links with pin joints

D. 4 links with pin joints

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4

The working depth of a gear is the radial distance from the

A. Pitch circle to the bottom of a tooth

B. Pitch circle to the top of a tooth

C. Top of a tooth to the bottom of a tooth

D. Addendum circle to the clearance circle

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4

In a steam engine, the distance by which the outer edge of the Dslide valve overlaps the steam port is called

A. Lead

B. Steam lap

C. Exhaust lap

D. None of these

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4

The motion between a pair when limited to a definite direction, irrespective of the direction of force applied, is known as

A. Completely constrained motion

B. Incompletely constrained motion

C. Successfully constrained motion

D. None of these

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4

The mechanism in which two are turning pairs and two are sliding pairs, is called a

A. Double slider crank chain

B. Elliptical trammel

C. Scotch yoke mechanism

D. All of these

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4

Klein's construction can be used when

A. Crank has a uniform angular velocity

B. Crank has non-uniform velocity

C. Crank has uniform angular acceleration

D. Crank has uniform angular velocity and angular acceleration

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4

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

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

Which type of gear train is used in clock mechanism to join hour hand and minute hand?

A. Simple gear train

B. Compound gear train

C. Reverted gear train

D. Epicyclic gear train

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4

For dynamic balancing of a shaft

A. The net dynamic force acting on the shaft is equal to zero

B. The net couple due to the dynamic forces acting on the shaft is equal to zero

C. Both (A) and (B)

D. None of the above

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4

The pressure angle of a cam depends upon

A. Offset between centre lines of cam and follower

B. Lift of follower

C. Angle of ascent

D. All of the above

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4

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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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

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

The contact ratio for gears is

A. Zero

B. Less than one

C. Greater than one

D. Infinity

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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

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4

A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

A. 2 mm

B. 2.22 mm

C. 2.50 mm

D. 3.0 mm

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4

Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts?

A. Theory of machines

B. Applied mechanics

C. Mechanisms

D. Kinetics

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4

In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

Angle of ascent 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 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

Pulley in a belt drive acts as

A. Cylindrical pair

B. Turning pair

C. Rolling pair

D. Sliding pair