Millwright Red Seal Bearings Exam with accurate detailed answers

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Millwright Red Seal Bearings Exam with accurate detailed || || || || || || || ||




answers


A Babbitt bearing percentage refers to its area of contact. This is found by:
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|| a. Feeler gauges
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|| b. Plastic gauge
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|| c. Bluing
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d. Lead wire - ✔✔c. Bluing
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A bearing with a "K" it denotes a tapered bearing. This is held in place by:
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|| a. Shaft collar
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b. A tapered adapter sleeve
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c. Lock nut
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d. Thread locker - ✔✔b. A tapered adapter sleeve
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A type of bearing mounted face to face and back-to-back is:
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a. Angular contact
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b. Conrad
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|| c. Ball||




|| d. Pillow Block - ✔✔a. Angular contact
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A bearing with a code of SKF 6212 has a bore of:
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a. 12mm
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|| b. ½" || ||




c. 60mm
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|| d. 62mm - ✔✔c. 60mm
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The bore is indicated by the last two digits of the bearing number.
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Up to 20mm the bore of the bearing is designated as :
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00= 10mm ||




01=12mm

02=15mm

03=17mm

Ex. 6200 ball bearing has bore of 10mm
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From 20mm to 80m to find bore multiply the last two figures of the bearing by the number
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5. ex. 6204 ball bearing has bore of 04 x 5 = 20mm
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Above 480mm ( # 6296) the bearing size is directly included in the bearing number.
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Roller thrust anti friction bearings carry what type of load?
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a. Radial
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b. Axial
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c. Angular
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d. Shock - ✔✔b. Axial
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Thrust Load (Axial) - A pure thrust ( axial) load means there is no radial load. All forces
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run parallel to shaft axis.
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examples are ball and needle thrust bearings. || || || || || ||




What do you use to check the clearance of a spherical roller bearing?
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a. Feeler gauge
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b. Babbitt
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c. Plastigauge
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d. Bluing - ✔✔a. Feeler gauge
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What temperature (in Fahrenheit) is a bearing to be heated to in an oil bath, prior to
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installation? ||




a. 248 to 250
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b. 260 to 262
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c. Always below 240
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d. Always above 260 - ✔✔a. 248 to 250
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What temperature (in Fahrenheit) is Babbitt poured at?
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|| a. 650 to 700
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b. 800 to 1000
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c. 300 to 325
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d. 575 to 775 - ✔✔a. 650 to 700
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Pour point - from 343 to 371*C (650 to 700*F)
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complete melting point - from 275-285*C ( 495 to 545*F)
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Complete solidification point - from 25- 28*C ( 40 - 50F ) below the complete melting point .
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What is "creep" in a bearing?
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a. The very slow rotation of the outer race
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b. The movement of the bearing as it rotates out of the housing
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|| c. A condition that allows for expansion of the pillow block due to heat
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