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Current Affairs January 2024

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4

In hydrodynamic bearings

A. The oil film pressure is generated only by the rotation of the journal

B. The oil film is maintained by supplying oil under pressure

C. Do not require external supply of lubricant

D. Grease is used for lubrication

Correct Answer :

A. The oil film pressure is generated only by the rotation of the journal


Related Questions

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Eye bolts are used for

A. Foundation purposes

B. Absorbing shock and vibrations

C. Transmission of power

D. Lifting and transportation of machines and cubicles

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4

In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as

A. Helix angle

B. Pressure angle

C. Pitch lead angle

D. None of these

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4

In case of pressure vessels having closed ends, the fluid pressure induces

A. Longitudinal stress

B. Shear stress

C. Circumferential stress

D. None of these

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4

A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zigzag riveting is proposed. Which of the following statement is correct?

A. There are four rivets per pitch length, all in double shear

B. There are four rivets per pitch length, out of which two are in single shear and two are in double shear

C. There are five rivets per pitch length, all in double shear

D. There are five rivets per pitch length, out of which four are in double shear and one is in single shear

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4

In worm, gears, pitch lead angle is

A. Half the angle between two inclined faces in axial plane

B. The angle between the tangent to the pitch helix and the plane of rotation

C. The angle between the tangent to the pitch helix and an element of the cylinder

D. None of the above

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4

Which of the following statement is correct?

A. The stress concentration in static loading is more serious in ductile materials and less serious in brittle materials

B. The stress concentration in static loading is more serious in brittle materials and less serious in ductile materials

C. The toughness of a material increases when it is heated

D. The shear stress in a beam varies from zero at the neutral surface and maximum at the outer fibres

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4

A column of length l is fixed at both ends. The equivalent length of the column is

A. l/2

B. l/√2

C. l

D. 2 l

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4

The crest diameter of a screw thread is same as

A. Major diameter

B. Minor diameter

C. Pitch diameter

D. Core diameter

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4

Which of the following pipe joints would be suitable for pipes carrying steam?

A. Flanged

B. Threaded

C. Bell and spigot

D. Expansion

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4

The wire ropes make contact at

A. Bottom of groove of the pulley

B. Sides and bottom of groove of the pulley

C. Anywhere in the groove of the pulley

D. Sides of groove of the pulley

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4

Rivets are generally specified by

A. Thickness of plates to be riveted

B. Length of rivet

C. Diameter of head

D. Nominal diameter

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4

When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

A. Bending stress only

B. A combination of torsional shear stress and bending

C. Direct shear stress only

D. A combination of bending stress and direct shear stress

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4

The resistance to fatigue of a material is measured by

A. Elastic limit

B. Ultimate tensile strength

C. Young's modulus

D. Endurance limit

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4

The suitable material for belt in agricultural machinery is

A. Leather

B. Rubber

C. Cotton duck

D. Balata gum

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According to I.B.R., the factor of safety of riveted joint should not be less than

A. 1

B. 2

C. 3

D. 4

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The angle of twist of shaft is

A. Directly proportional to (shaft diameter)²

B. Inversely proportional to (shaft diameter)²

C. Directly proportional to (shaft diameter)⁴

D. Inversely proportional to (shaft diameter)⁴

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4

Which is correct statement?

A. A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron

B. A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel

C. Both will be equally rigid

D. Which one is rigid will depend on several other factors

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In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.

A. Equal to

B. Twice

C. Three times

D. Four times

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4

The power transmitted by belt drive depends upon

A. Belt velocity

B. Initial belt tension

C. Arc of contact

D. All of the above

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4

Taper usually provided on cotter is

A. 1 in 5

B. 1 in 10

C. 1 in 24

D. 1 in 40

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The endurance limit of a material with finished surface in comparison to rough surface is

A. More

B. Less

C. Same

D. More or less depending on quantum of load

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4

The resilience of a bolt may be increased by

A. Increasing its shank diameter

B. Increasing its length

C. Decreasing its shank diameter

D. Decreasing its length

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4

Brittle coating technique is used for

A. Determining brittleness

B. Protecting metal against corrosion

C. Protecting metal against wear and tear

D. Experimental stress analysis

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4

Which of the following statement is wrong for a connecting rod?

A. The connecting rod will be equally strong in buckling about X-axis and Y-axis, if Ixx = 4 Iyy

B. If Ixx > 4 Iyy, the buckling will occur about Y-axis

C. If Ixx < 4 Iyy, the buckling will occur about X-axis

D. The most suitable section for the connecting rod is T-section

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In testing a material for endurance strength, it is subjected to

A. Static load

B. Dynamic load

C. Impact load

D. Completely reversed load

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The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.

A. Heavier

B. Lighter

C. Moderate

D. None of these

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Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.

A. Twice

B. Four times

C. Eight times

D. Sixteen times

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4

The cross-section of the arm of a bell crank lever is

A. Rectangular

B. Elliptical

C. I-section

D. Any one of these

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4

When a nut is tightened by placing a washer below it, the bolt will be subjected to following type of loads

A. Compression

B. Tension

C. Shear

D. Combined loads

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Which of the following formula is used in designing a connecting rod?

A. Euler's formula

B. Rankine's formula

C. Johnson's straight line formula

D. Johnson's parabolic formula