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

A rolling contact bearing is specified as X307. Calculate the bearing diameter.

(a) 35 mm

(b) 28 mm

(c) 21 mm

(d) 7 mm
by

1 Answer

Answer :

(a) 35 mm
by

Related questions

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Calculate the shaft diameter on rigidity basis if torsional moment is 196000N-mm, length of shaft is 1000mm. Permissible angle of twist per meter is 0.5’ and take G=79300N/mm2. a) None of the listed b) 41.2mm c) 35.8mm d) 38.8mm

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

A thick film bearing is a bearing (A) Where the surfaces of journal and the bearing are completely separated by a film of lubricant (B) Where the surfaces of journal and the bearing are partially separated by a film of lubricant and there is partial metal to metal contact (C) Where the surfaces of journal and the bearing are separated by a film created by elastic deflection of parts (D) Where there is no lubricant

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Last Answer : (A) Where the surfaces of journal and the bearing are completely separated by a film of lubricant

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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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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For 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 : (A) There should be relative motion between the surfaces of the journal and the bearing and wedge shaped clearance space

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Last Answer : (C) Less than 180°

A thin film bearing is a bearing (A) Where the surfaces of journal and the bearing are completely separated by a film of lubricant (B) Where the surfaces of journal and the bearing are partially separated by a film of lubricant and there is partial metal to metal contact (C) Where the surfaces of journal and the bearing are separated by a film created by elastic deflection of parts (D) Where there is no lubricant

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Last Answer : (B) Where the surfaces of journal and the bearing are partially separated by a film of lubricant and there is partial metal to metal contact

In case of full journal bearing, the angle of contact of the bushing with the journal is (A) 60° (B) 90° (C) 180° (D) 360°

Description : In case of full journal bearing, the angle of contact of the bushing with the journal is (A) 60° (B) 90° (C) 180° (D) 360°

Last Answer : (D) 360°

In case of partial bearing, the angle of contact of the bushing with the journal is usually (A) 120° (B) 180° (C) 45° (D) 360°

Description : In case of partial bearing, the angle of contact of the bushing with the journal is usually (A) 120° (B) 180° (C) 45° (D) 360°

Last Answer : (A) 120°

In hydrodynamic bearing, when the shaft begins to rotate in clockwise direction, (A) The journal climbs to the right side of the bearing without metal to metal contact (B) The journal climbs to the left side of the bearing without metal to metal contact (C) The journal sinks down to the bottom of the bearing (D) The journal is at the center of the bearing

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Last Answer : (A) The journal climbs to the right side of the bearing without metal to metal contact

A zero film bearing is a bearing (A) Where the surfaces of journal and the bearing are separated by a thick film of lubricant (B) Where the surfaces of journal and the bearing are partially separated by a film of lubricant and there is partial metal to metal contact (C) Where the surfaces of journal and the bearing are separated by a film created by elastic deflection of parts (D) Where there is no lubricant

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Last Answer : (D) Where there is no lubricant

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

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

Last Answer : a) True

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Last Answer : b) No it has point contact and hence low rigidity

Needles bearing consist of rollers of small diameter and very small length. (a) True (b) False

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Last Answer : (b) False

The length to diameter ratio for a square bearing is (A) More than 1 (B) Less than 1 (C) 8 (D) 1

Description : The length to diameter ratio for a square bearing is (A) More than 1 (B) Less than 1 (C) 8 (D) 1

Last Answer : (D) 1

The length to diameter ratio for a short bearing is (A) More than 1 (B) Less than 1 (C) 8

Description : The length to diameter ratio for a short bearing is (A) More than 1 (B) Less than 1 (C) 8

Last Answer : (B) Less than 1

Needles bearing consist of rollers of small diameter and very small length. a) True b) False

Description : Needles bearing consist of rollers of small diameter and very small length. a) True b) False

Last Answer : b) False