The purpose of lubrication in an antifriction bearing is (a) to reduce the friction between balls and races (b) dissipation of frictional heat prevention of corrosion (c) protection of the bearing from dirt and other foreign particles (d) all of the mentioned

The purpose of lubrication in an antifriction bearing is

(a) to reduce the friction between balls and races

(b) dissipation of frictional heat prevention of corrosion

(c) protection of the bearing from dirt and other foreign particles

(d) all of the mentioned
by

1 Answer

Answer :

(d) all of the mentioned
by

Related questions

Which bearing is Antifriction bearing A. Thick lubrication bearing B. Thin lubrication bearing C. Rolling or ball bearing D. None

Description : Which bearing is Antifriction bearing A. Thick lubrication bearing B. Thin lubrication bearing C. Rolling or ball bearing D. None

Last Answer : C. Rolling or ball bearing

Rolling contact bearing is also called as A. Plastic bearing B. Thin lubrication bearing C. Thick lubrication bearing D. Antifriction bearing.

Description : Rolling contact bearing is also called as A. Plastic bearing B. Thin lubrication bearing C. Thick lubrication bearing D. Antifriction bearing.

Last Answer : D. Antifriction bearing.

An antifriction bearing consists of (a) rolling elements (b) races (c) cages (d) all of the listed

Description : An antifriction bearing consists of (a) rolling elements (b) races (c) cages (d) all of the listed

Last Answer : (d) all of the listed

Consider the following statements: [IES 2007] For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is- 1. Proportional to the area of contact 2. Proportional to the viscosity of lubricant 3. Proportional to the speed of rotation 4. Independent of the pressure Which of the statements given above are correct? (a) 1, 2, 3 and 4 (b) 1 and 4 only (c) 2, 3 and 4 only (d) 2 and 3 only

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Last Answer : (a) 1, 2, 3 and 4

The antifriction bearings (a) have low starting and low running friction at moderate speeds (b) have a high initial cost (c) can carry both radial and thrust loads (d) all the mentioned

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Which one of the following pair is correctly matched? [IES-2000] (a) Beauchamp tower ........................First experiments on journal bearings (b) Osborne Reynolds ........................Antifriction bearings (c) Somerfield number........................Pivot and Collar bearings (d) Ball bearings...............................Hydrodynamic lubrication

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Last Answer : (a) Beauchamp tower ........................First experiments on journal bearings

Which of the following are not true for petroff’s equation? a) Shaft is considered concentric with the bearing b) Bearing is subjected to light load c) Is used to find coefficient of friction d) Frictional torque is given by fpr2l

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Last Answer : d) Frictional torque is given by fpr2l

Which of the following is an antifriction bearing? (a) journal bearing (b) collar bearing (c) needle bearing (d) pivot bearing

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The ball bearings are provided with a cage (a) to reduce friction (b) to facilitate slipping of balls (c) to prevent the lubricant from flowing out (d) to maintain the balls at a fixed distance apart

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Wood is well suited to use as bearing on straw walker cranks in combine due to fact a) Wood corrosion resistance b) Split bearing are needed for practical purpose c) It can take radial as well as thrust loads d) No lubrication is required

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Last Answer : b) Split bearing are needed for practical purpose

Balls and the races of the deep groove ball may roll freely without any sliding. a) True b) False

Description : Balls and the races of the deep groove ball may roll freely without any sliding. a) True b) False

Last Answer : a) True

Antifriction bearings are (a) sleeve bearings (b) hydrodynamic bearings (c) thin lubricated bearings (d) none of the mentioned

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Last Answer : (d) none of the mentioned

Assertion (A): Oil as a cutting fluid result in a lower coefficient of friction. Reason (R): Oil forms a thin liquid film between the tool face and chip, and it provides 'hydrodynamic lubrication'. [IES- 2000] (a) Both A and R are individually true and R is the correct explanation of A (b) Both A and R are individually true but R is not the correct explanation of A (c) A is true but R is false (d) A is false but R is true

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Last Answer : (c) A is true but R is false

Assertion (A): Hydrostatic lubrication is more advantageous when compared to hydrodynamic lubrication during starting and stopping the journal in its bearing. Reason (R): In hydrodynamic lubrication, the fluid film pressure is generated by the rotation of the journal. [IES-1998] (a) Both A and R are individually true and R is the correct explanation of A (b) Both A and R are individually true but R is not the correct explanation of A (c) A is true but R is false (d) A is false but R is true

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A journal bearing with hydrodynamic lubrication is running steadily with a certain amount of minimum film thickness. When the load and speed are doubled, how does the minimum film thickness vary? [IES-2008] (a) Remains unchanged (b) Gets doubled (c) Gets reduced to one-fourth of original value (d) Gets reduced to half of original value

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Last Answer : (a) Remains unchanged

For elasto-hydrodynamic lubrication (A) There should be relative motion between the surfaces of the journal and the bearing and wedge shaped clearance space (B) There should be external source like pump to supply lubricant under pressure (C) There should be elastic deformation of the parts in contact (D) There should be metal to metal contact

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Last Answer : (C) There should be elastic deformation of the parts in contact

For hydrostatic lubrication (A) There should be relative motion between the surfaces of the journal and the bearing and wedge shaped clearance space (B) There should be external source like pump to supply lubricant under pressure (C) There should be elastic deformation of the parts in contact (D) There should be metal to metal contact

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Last Answer : (B) There should be external source like pump to supply lubricant under pressure

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A journal bearing is a ______ contact bearing working on the hydrodynamic lubrication and which supports load in____ direction. a) Sliding, Axial b) Rolling, Radial c) Sliding, Radial d) Rolling, Axial

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Thick film lubrication describes a phenomenon where two surfaces are _______ separated. a) Completely b) Partially c) Not d) None of the mentioned

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The construction feature which makes tapered roller bearings unique in that races are (a) attachable (b) separable (c) self-aligning (d) none of the mentioned

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Which one of the following parts of a ball bearing acts as a barrier between the balls preventing them from bumping into each other? (a) Inner race (b) Outer race (c) Rolling element (d) Cage

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_____ is a surface fatigue failure which occurs when the load on the bearing part exceeds the surface endurance strength of the material. (a) Scoring (b) Pitting (c) Corrosion

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Potential flow is characterised by the (A) Irrotational and frictionless flow(B) Irrotational and frictional flow(C) One in which dissipation of mechanical energy into heat occurs(D) Formation of eddies within the stream

Description : Potential flow is characterised by the (A) Irrotational and frictionless flow (B) Irrotational and frictional flow (C) One in which dissipation of mechanical energy into heat occurs (D) Formation of eddies within the stream

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Antifriction bearings are (a) thick lubricated bearings (b) plastic bearings (c) ball and roller bearings (d) thin lubricated bearings

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The rolling contact bearings are known as (a) thick lubricated bearings (b) plastic bearings (c) thin lubricated bearings (d) antifriction bearings

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Antifriction bearings are A. Sleeve bearings B. Hydrodynamic bearings C. Thin lubricated bearings D. None of the above

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Which one of the following types of bearings is employed in shafts of gearboxes of automobiles? [IES-1999] (a) Hydrodynamic journal bearings (b) Multi-lobed journal bearings (c) Antifriction bearings (d) Hybrid journal bearings

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Match List-I (Type of Anti-friction bearing) with List-II (Specific Use) and select the using the code given below the Lists: [IES-2006] List-I List -II A. Self-aligning ball bearing 1. For pure axial load B. Taper roller bearing 2. For hinged condition C. Deep groove ball bearing 3. For pure radial load D. Thrust ball bearing 4. For axial and radial load A B C D A B C D (a) 2 1 3 4 (b) 3 4 2 1 (c) 2 4 3 1 (d) 3 1 2 4

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In an oil-lubricated journal bearing, coefficient of friction between the journal and the bearing. [IES-1995] (a) Remains constant at all speeds. (b) is minimum at zero speed and increases monotonically with increase in speed. (c) is maximum at zero speed and decreases monotonically with increase in speed. (d) becomes minimum at an optimum speed and then increases with further increase in speed.

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Consider tile following statements: [IES-1993; 2002; 2006] Radius of friction circle for a journal bearing depends upon 1. Coefficient of friction 2. Radius of the journal 3. Angular speed of rotation of the shaft Which of the statements given above are correct? (a) 1,2 and 3 (b) Only 1 and 2 (c) Only 2 and 3 (d) Only 1 and 3

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Increase in values of which of the following results in an increase of the coefficient of friction in a hydrodynamic bearing? [IES 2007] 1. Viscosity of the oil. 2. Clearance between shaft and bearing. 3. Shaft speed. Select the using the code given below: (a) 1 and 2 only (b) 1 and 3 only (c) 2 and 3 only (d) 1, 2 and 3

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Partial bearing is preferred over journal bearing. a) True b) No c) More friction losses d) Can’t be determined

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In addition to testing the calibration of a circuit breaker, maintenance should include all of the following EXCEPT ______________. A. changing out of magnetic elements and thermal heaters yearly B. checking for corrosion, accumulation of dirt and thermal fatigue C. inspecting for loose or missing parts D. making sure foreign matter does not block tripping element

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In hydrodynamic lubrication, film thickness remains unaffected by change in speeds. a) True b) Increase with increase in speed c) Decrease with increase in speed d) Disappear as the speed tends to infinty

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Last Answer : b) Increase with increase in speed

If fluid film pressure is high and surface rigidity is low than mode of lubrication is called as elastohydrodynamic lubrication. a) True b) False

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What type of bearing will you recommend for use in the conveyor belt roller? (a) Ball-bearing (b) Roller bearing (c) Magnetic bearing (d) None of the mentioned

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