Rolling Contact Bearings, Spur Gears and Helical Gears topics include: Bearings and its types, load carrying capacities, sliding contact bearings, viscosity, spur gears and its terminology, gear trains and helical gears. Here's what you should know about spur gears, helical gears, and rolling contact bearings: Spur gears: A cylindrical gear with teeth that are parallel to the shaft. Spur gears are the most popular type of cylindrical gear and are used to transfer mechanical motion. They are simple, efficient, and versatile, and are often used in applications where the rotational motion... Show more

Rolling Contact Bearings, Spur Gears and Helical Gears topics include: Bearings and its types, load carrying capacities, sliding contact bearings, viscosity, spur gears and its terminology, gear trains and helical gears.

Here's what you should know about spur gears, helical gears, and rolling contact bearings:
Spur gears: A cylindrical gear with teeth that are parallel to the shaft. Spur gears are the most popular type of cylindrical gear and are used to transfer mechanical motion. They are simple, efficient, and versatile, and are often used in applications where the rotational motion between two shafts needs to be parallel and coplanar.
Helical gears: A simple machine that controls the direction or strength of a force. Helical gears are used in applications that require high speeds, significant power transmission, or noise reduction. They are known for their smooth and efficient power transmission, making them a popular choice in industries such as automotive, manufacturing, and robotics.
Rolling contact bearings: When choosing bearings, consider the rated speed, dynamic axial or thrust load, and dynamic radial load. Helical gears require thrust or roller bearings, which are typically larger (and more expensive) than the simple bearings used with spur gears.

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Machine Design Practice Test: Rolling Contact Bearings, Spur Gears and Helical Gears

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25 Questions

1. Calculate the kinematic viscosity if Saybolt viscosity is 400cSt.

87.55SUS86.32SUS400SUS40.25SUS

2. Which of the following isn’t the property of taper roller?

Easy dismantlingHigh rigidityAll are the properties of tapper rollerTake low radial and heavy loads

3. Undercutting is consider healthy for the tooth as it eliminates undercutting.

FalseTrueDon't KnowMaybe

4. The life of an individual ball bearing is the time period for which it works without any signs of failures.

TrueMaybeFalseDon't Know

5. There are ____ standard systems for the shape of gear teeth.

1243

6. Bevel gears impose ____ loads on the shafts.

RadialRadial and thrustNeither radial nor thrustThrust

7. For a hydrostatic thrust bearing,
Thrust load=450kN, shaft speed=730rpm, shaft diameter=450mm, recess diameter=310mm,film thickness=0.15mm,viscosity of lubricant=160SUS and specific gravity=0.86.
Calculate power loss in pumping.

2.68kW3.35kW4.2kW2.6kW

8. Scoring is a ________ phenomenon.

Stick-slipFractureIn-outFatigue

9. Needles bearing consist of rollers of small diameter and very small length.

FalseTrueDon't KnowMaybe

10. If viscosity of the lubricant is very low than BCN will lie in the region.

BCCDPoint CCan’t be determined

11. Coefficient of friction is minimum at

It is same at each pointCDB

12. Temperature rise in partial bearing is ____ than full bearing.

LesserGreaterEqualUndeterminable

13. Which of the following is not true about gears?

Transmit large powerConstant velocity ratioPositive driveBulky construction

14. Which of the following statements are not true?

20⁰ pressure angle has quieter operation then 14.5⁰Increasing pressure angle improves the tooth strengthContact duration is decreased with increase in pressure angleAll of the statements are true

15. Deep groove ball bearings creates a lot of noise.

They create very less noiseDepends on the applicationYesNo reference frame for comparison is mentioned

16. Newton law of viscosity states that shear stress is proportional to rate of shear at any point in the fluid.

TrueFalseMaybeDon't Know

17. Interference is maximum when the largest pinion is in mesh with the smallest gear.

TrueFalseMaybeDon't Know

18. Extreme pressure causes ______ wear in the bearing parts.

AbrasivePittingCorrosiveAll of these

19. Transverse fillet weld can be designed using the same equations as of parallel fillet weld.

MaybeFalseDon't KnowTrue

20. A planetary gear train is shown in the figure. Number of teeth on the sun gear A, planet gear B and fixed ring gear D are given by 30, 70 and 140 respectively. Module is taken as 5mm. Calculate the tangential component of gear tooth force.

303.2N220.6N633.2N454.7N

21. Interference is caused by?

Large size of dedendumMeshing of involute and no-involute profilesOverlapping of tooth profilesAll of these

22. A rolling contact bearing is specified as X307. Determine the series.

Medium seriesExtra light seriesHeavy seriesLight series

23. There is problem of alignment in deep groove ball bearings.

It aligns itself only in some particular casesNo, it is self-aligningYesCan’t be determined

24. Taper rolling supports

Both axial and thrust loadsThrust loadsNone of theseAxial loads

25. In angular contact bearings, ____ bearings are required to take thrust load in both directions.

3124