THEORY OF MACHINE QUIZ

A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the

Angular velocity of journal

Magnitude of the forces on journal

Radius of journal

Clearance between journal and bearing

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The absolute acceleration of any point ‘P’ in a link about center of rotation ‘O’ is

At 45° to PO

Along PO

Perpendicular to PO

None of the listed here

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The values of velocity and acceleration of piston at near dead center for a slider-crank mechanism will be

0, 0

0, and less than coV

cor, 0

0, and more than co2r

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

The former is mathematically accurate

The former is most rigid

The former is most economical

The former is having turning pair

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

Inner dead centre

All of the listed here

Outer dead centre

Right angles to the link of the stroke

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The fundamental equation for correct steering is (where φ and α = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles, and d = Wheel base)

cotφ - cotα = c/b

sinφ + sinα = b/c

cosφ - sinα = c/b

tanφ + cotα = b/c

TRUE ANSWER : ?
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A body having moment of inertia o:m2 is rotating at 210 RPM and r with another body at rest having I 40 kg m2. The resultant speed after ing will be

90 RPM

100 RPM

80 RPM

data are insufficient

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In a hydrodynamic journal bearing, there is

A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing

A forced lubricant between the journal and the bearing

No lubricant between the journal and the bearing

A thick film of lubricant between the journal and the bearing

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In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from

15°-25°

25°-30°

30°-40°

10°-15°

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The Klein's method of construction for reciprocating engine mechanism

Is based on acceleration diagram

Enables determination of Cariole’s component

Utilizes a quadrilateral similar to the diagram of mechanism for reciprocating engine

Is a simplified form of instantaneous center method

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