For the majority of bearings, actual life is considerably greater than rated life. (a) True (b) False

For the majority of bearings, actual life is considerably greater than rated life.

(a) True

(b) False
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1 Answer

Answer :

(a) True
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Related questions

For majority of bearings, actual life is considerably greater than rated life. a) True b) False

Description : For majority of bearings, actual life is considerably greater than rated life. a) True b) False

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The dynamic load-carrying capacity of a bearing is defined as the radial load in radial bearings that can be carried for a minimum life of 1000 revolutions. (a) True (b) False

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Assertion (A): In steady rotating condition the journal inside a hydrodynamic journal bearing remains floating on the oil film. [IES-2008] Reason (R): The hydrodynamic pressure developed in steady rotating conditions in journal bearings balances the load on the journal. (a) Both A and R are true and R is the correct explanation of A (b) Both A and R are 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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In steam and gas turbines, rolling contact bearings are used. a) True b) False

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Last Answer : b) False

Sliding contact bearings, also called plain bearings have no problem of wear. a) True b) False

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The ball bearing is subjected to a radial load of 4000 N. Expected life for 90% bearings is 9000 hr and the shaft is rot (a) 42.21 kN (b) 37.29 kN (c) 26.33 kN (d) 35.22 kN

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The rated life of a bearing varies (a) directly as load (b) inversely as the square of the load (c) inversely as the cube of the load

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The rated life of a bearing varies A. Directly as load B. Inversely as square of load C. Inversely as cube of load D. Inversely as fourth power of load

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The bearings of medium series have capacity __________ over the light series. (a) 10 to 20% (b) 20 to 30% (c) 30 to 40% (d) 40 to 50%

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The bearings of heavy series have capacity __________ over the medium series. (a) 10 to 20% (b) 20 to 30% (c) 30 to 40% (d) 40 to 50%

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Which of the following elements is not used as a roller in roller bearings? (a) Cylindrical (b) Taper (c) Spherical (d) None of the mentioned

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In angular contact bearings, ____ bearings are required to take thrust load in both directions. (a) 1 (b) 2 (c) 3 (d) 4

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Different types of bearings are designed to operate at different operating speeds. Speed is specified as the maximum (a) rpm (b) metres/second (c) metres/minute (d) metres/hour

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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 tapered roller bearings can take (a) radial load only (b) axial load only (c) both radial and axial loads (d) none of the mentioned

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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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The rolling contact bearings as compared to sliding contact bearings have (a) small overall dimensions (b) accuracy of shaft alignment (c) low starting and low running friction except at very high speeds (d) all the mentioned

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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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Match List -I (Bearings) with List-II (Applications) and select the using the codes given below the lists: [IAS-1998] List –I List-II A. Journal bearing 1. Electric motors B. Thrust bearing 2. Watches C. Conical pivot bearing 3. Marine engines D. Ball bearing 4. Swivelling chairs A B C D A B C D (a) 3 4 1 2 (b) 4 2 1 3 (c) 3 4 2 1 (d) 4 2 3 1

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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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Last Answer : (c) Antifriction bearings

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

Match List I with List II and select the : [IES-2002] List I (Bearings) List II (Load type) A. Hydrodynamic Journal bearing 1. High radial and thrust load combined B. Rectangular Hydrostatic bearing 2. Radial load only C. Taper Roller bearing 3. Thrust load only D. Angular contact ball bearing 4. Medium to low radial and thrust combined A B C D A B C D (a) 2 3 1 4 (b) 4 1 3 2 (c) 2 1 3 4 (d) 4 3 1 2

Description : Match List I with List II and select the : [IES-2002] List I (Bearings) List II (Load type) A. Hydrodynamic Journal bearing 1. High radial and thrust load combined B. Rectangular Hydrostatic bearing 2. Radial load only C. Taper Roller ... (a) 2 3 1 4 (b) 4 1 3 2 (c) 2 1 3 4 (d) 4 3 1 2

Last Answer : (a) 2 3 1 4

Consider the following pairs of types of bearings and applications: 1. Partial Journal bearing................... Rail wagon axles 2. Full journal bearing ......................Diesel engine crank-shaft 3. Radial bearing ............................Combined radial and axial loads Which of these pairs is/are correctly matched? [IES-2000] (a) 1 alone (b) 1 and 2 (c) 2 and 3 (d) 1, 2 and 3

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Last Answer : (b) 1 and 2

In a journal bearings, the radius of the friction circle increases with the increase in- [IES-1997] (a) Load (b) Radius of the journal (c) Speed of the journal (d) Viscosity of the lubricant

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Last Answer : (b) Radius of the journal

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Description : In sliding contact bearings, a positive pressure can be built up and a load supported by a fluid only by the use of a: [IES-2005] (a) Diverging film (b) Converging-diverging film (c) Converging film (d) Flat film

Last Answer : (c) Converging film

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Last Answer : (B) The oil film is maintained by supplying oil under pressure