Mechanical Engineering · all questions

Theory Of Machine
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Q61

Open question

A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)

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Q62

Open question

The maximum fluctuation of energy is the

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Q63

Open question

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)

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Q64

Open question

The example of lower pair is

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Q65

Open question

Which of the following is an example of sliding pair?

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Q66

Open question

The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity

ω_{1}

rad/s in the clockwise direction and the link OB turns with angular velocity

ω_{2}

rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

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Q67

Open question

The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity

ω_{1}

rad/s in the clockwise direction and the link OB turns with angular velocity

ω_{2}

rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

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Q68

Open question

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

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Q69

Open question

The equation of motion for a single degree of freedom system with viscous damping is

4 \frac{d ^{2} x}{d t ^{2}} + 9 \frac{dx}{dt} + 16 x = 0.

The damping ratio of the system is

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Q70

Open question

Crowning on pulleys helps

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Q71

Open question

If two moving elements have surface contact in motion, such pair is known as

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Q72

Open question

The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts,

ω

= Angular speed of crank, r = Radius of crank,

θ

= Angle of inclination of crank with the line of stroke and n = Ratio of the length of connecting rod to radius of crank)

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Q73

Open question

The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts,

ω

= Angular speed of crank, r = Radius of crank,

θ

= Angle of inclination of crank with the line of stroke and n = Ratio of the length of connecting rod to radius of crank)

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Q74

Open question

The velocity of piston in a reciprocating steam engine is given by (where

ω

= Angular velocity of crank, r = Radius of crank pin circle,

θ

= Angle turned by crank from inner dead center and n = Ratio of length of connecting rod to the radius of crank)

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Q75

Open question

The sensitiveness of the governor __________ as the speed range decreases.

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Q76

Open question

For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is

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Q77

Open question

Which of the below are inversions of slider crank mechanism?
1. Oscillating cylinder engine mechanism
2. Toggle mechanism
3. Radial cylinder engine mechanism
4. Quick return mechanism

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Q78

Open question

The unbalanced force due to revolving masses

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Q79

Open question

The relative velocity of B with respect to A in a rigid link AB is

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Q80

Open question

A shaft carrying three rotors will have

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Theory Of Machinepractice.

Theory Of Machine
practice.