. In gear boxes and small size motors, rolling contact bearings are used. a) True b) False

. In gear boxes and small size motors, rolling contact bearings are used.

a) True

b) False
by

1 Answer

Answer :

a) True
by

Related questions

In steam and gas turbines, rolling contact bearings are used. a) True b) False

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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

Description : 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

Last Answer : (d) all the mentioned

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

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

Last Answer : (d) antifriction bearings

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

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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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Last Answer : (c) 3 4 2 1

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

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Assertion (A): In hydrodynamic journal bearings, the rotating journal is held in floating condition by the hydrodynamic pressure developed in the lubricant. Reason (R): Lubricant flows in a converging-diverging channel. [IES-1994] (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 : (a) Both A and R are individually true and R is the correct explanation of A

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

Description : 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 ... A (c) A is true but R is false (d) A is false but R is true

Last Answer : (a) Both A and R are true and R is the correct explanation of A

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

Description : 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

Last Answer : b) False

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

Last Answer : a) True

Certain types of radial bearings can also take thrust load. a) True b) False

Description : Certain types of radial bearings can also take thrust load. a) True b) False

Last Answer : a) True

Hot rolling produces a stronger shaft then cold rolling. a) True b) False

Description : Hot rolling produces a stronger shaft then cold rolling. a) True b) False

Last Answer : b) False

Hot rolling produces a stronger shaft then cold rolling. a) True b) False

Description : Hot rolling produces a stronger shaft then cold rolling. a) True b) False

Last Answer : b) False

Which of the following cannot tolerate misalignment? (a) Angular contact bearing (b) Cylinder roller bearing (c) Thrust ball bearings (d) All of the listed

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Which of the bearings given below SHOULD NOT be subjected to a thrust load? (a) Deep groove ball bearing (b) Angular contact ball bearing (c) Cylindrical (straight) roller bearing (d) Single row tapered roller bearing

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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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Last Answer : (b) 2

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

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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

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Last Answer : (c) Converging film

Which of the following cannot tolerate misalignment? a) Angular contact bearing b) Cylinder roller bearing c) Thrust ball bearings d) All of the listed

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Last Answer : d) All of the listed

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

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Last Answer : c) 2

_______is suitable as a lubricant for heavy-duty applications of rolling contact bearing. (a) Grease (b) Lubricating oil (c) Graphite (d) Air

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________is suitable as a lubricant for low and moderate loads applications of rolling contact bearing. (a) Grease (b) Lubricating oil (c) Graphite (d) Air

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A rolling contact bearing is specified as X307. Calculate the bearing diameter. (a) 35 mm (b) 28 mm (c) 21 mm (d) 7 mm

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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.

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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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A rolling contact bearing is specified as X307. Determine the series. a) Extra light series b) Light series c) Medium series d) Heavy series

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Last Answer : c) Medium series

Deep groove ball bearings are used for (a) heavy thrust load only (b) the small angular displacement of shafts (c) radial load at high speed (d) combined thrust and radial loads at high speed

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Angular contact bearing can take thrust as well as radial loads. (a) True (b) False

Description : Angular contact bearing can take thrust as well as radial loads. (a) True (b) False

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Angular contact bearing can take thrust as well as radial loads. a) True b) False

Description : Angular contact bearing can take thrust as well as radial loads. a) True b) False

Last Answer : a) True

When disassembling electric motors for maintenance or overhaul, ________________. A. punch mark frame and end bells for proper assembly B. wrap bearings in lint free cloths if they are to be reused C. tag and store small parts in a box D. all of the above

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What are the types of bearings are adopted for small motors and large motors?

Description : What are the types of bearings are adopted for small motors and large motors?

Last Answer : Small motors (LT motors) Horizontal mounted - deep groove ball bearing at both ends. Medium motors Roller bearing at DE and deep groove bearing at NDE. Large motors (HT motors above 750 kW) Horizontal ... mounted - face to face angular contact ball bearing at NDE and roller or ball bearing at DE.

Ball bearings are, usually, made from (a) low carbon steel (b) high carbon steel (c) medium carbon steel (d) chrome steel

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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

Description : 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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Calculate the bearing life if expected life for 90% bearings is 9000 hr and the shaft is rotating at 1500 rpm. (a) 850 million rev (b) 810 million rev (c) 810 hr (d) 850 hr

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Last Answer : (b) 810 million rev

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%

Description : 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%

Last Answer : (c) 30 to 40%

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%

Description : 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%

Last Answer : (b) 20 to 30%

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

Description : 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

Last Answer : (d) None of the mentioned

The piston pin bearings in heavy-duty diesel engines are (a) needle roller bearings (b) tapered roller bearings (c) spherical roller bearings (d) cylindrical roller bearings

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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

Description : 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

Last Answer : (b) separable

Tapered roller bearings can take (a) radial load only (b) axial load only (c) both radial and axial loads and the ratio of these being greater than unity (d) both radial and axial loads and the ratio of these being less than unity

Description : Tapered roller bearings can take (a) radial load only (b) axial load only (c) both radial and axial loads and the ratio of these being greater than unity (d) both radial and axial loads and the ratio of these being less than unity

Last Answer : (c) both radial and axial loads and the ratio of these being greater than unity

Which of the following bearings carry thrust load in one direction? (a) Spherical roller thrust bearings (b) Taper roller bearings (c) Spherical roller thrust bearings and taper roller bearings (d) none of the mentioned

Description : Which of the following bearings carry thrust load in one direction? (a) Spherical roller thrust bearings (b) Taper roller bearings (c) Spherical roller thrust bearings and taper roller bearings (d) none of the mentioned

Last Answer : (c) Spherical roller thrust bearings and taper roller bearings

In standard taper roller bearings, the angle of taper of the outer raceway is (a) 5° (b) 8° (c) 15° (d) 25°

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Last Answer : (d) 25°

There is a problem of alignment in deep groove ball bearings. (a) Yes (b) No, it is self-aligning (c) It aligns itself only in some particular cases (d) Can’t be determined

Description : There is a problem of alignment in deep groove ball bearings. (a) Yes (b) No, it is self-aligning (c) It aligns itself only in some particular cases (d) Can’t be determined

Last Answer : (a) Yes

Deep groove ball bearings create a lot of noise. (a) Yes (b) Depends on the application (c) They create very less noise (d) No reference frame for comparison is mentioned

Description : Deep groove ball bearings create a lot of noise. (a) Yes (b) Depends on the application (c) They create very less noise (d) No reference frame for comparison is mentioned

Last Answer : (c) They create very less noise

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

Description : 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

Last Answer : (b) metres/second

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

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Last Answer : (c) ball and roller bearings

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

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

Last Answer : (d) none of the mentioned

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

Description : 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

Last Answer : (c) both radial and axial loads