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. Cylindrical load bearing has lower load capacity as compared to deep groove ball bearing.

MaybeDon't KnowFalseTrue

2. The bearing is subjected to a radial load of 4000N. Expected life for 90% bearings is 9000h and shaft is rotating at 1500rpm. Calculate the dynamic load capacity.

42.21kN37.29kN35.22kN26.33kN

3. Calculate the bearing life if expected life for 90% bearings is 9000h and shaft is rotating at 1500rpm.

810 million rev850h850 million rev810 h

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

Don't KnowTrueFalseMaybe

5. If driving gear rotates ACW, driven gear will rotate in which direction?

CWBoth CW & ACWCan’t be determinedACW

6. The common normal to the curves of the two teeth must not pass through the pitch point.

It may or may not passIt must passNone of the listedTrue

7. Is it possible to transmit power between shafts lying in different planes using gears?

Don't KnowYesNoMaybe

8. Velocity ratio and transmission ratio are the same thing.

FalseDon't KnowTrueMaybe

9. Which of the following can be used for power transmission in intersecting shafts.

Helical GearNone of the listedBevel GearSpur Gear

10. Herringbone gear can be used in

Both intersection and parallel shaftsIntersecting shafts onlyNone of theseParallel shafts only

11. Which of the following statements are not true?

Contact duration is decreased with increase in pressure angleIncreasing pressure angle improves the tooth strength20⁰ pressure angle has quieter operation then 14.5⁰All of the statements are true

12. A journal bearing is a ______ contact bearing working on the hydrodynamic lubrication and which supports load in____ direction.

Sliding, AxialRolling, RadialRolling, AxialSliding, Radial

13. Angular contact bearing can take thrust as well as radial loads.

FalseTrueDon't KnowMaybe

14. Pressure angle is _____ in case of cycloidal teeth.

zeroVariableNone of the listedConstant

15. Which of the following have stronger teeth?

Both have equal strengthFull depth teethStub teethCan’t be determined

16. If driving gear rotates CW, driven gear will rotate?

ACWBoth CW and ACWCan’t be determinedCW

17. Taper rolling supports

Both axial and thrust loadsNone of theseThrust loadsAxial loads

18. The amount of backlash depends on

Centre distanceDiameteral pitchAll of theseModule

19. A pair of spur gears consist of 25 teeth pinion meshing with a 115 teeth gear. The module is 5mm. Calculate the tooth thickness.

7.854mm5.44mm6.23mm8.16mm

20. The bearing characteristic number shown in the graph is directly proportional to the unit bearing pressure.

MaybeFalseTrueDon't know

21. Inaccuracies in tooth profile lead to concentration of pressure on the middle of tooth.

Don't KnowFalseMaybeTrue

22. The two gears are said to have conjugate motion if

None of theseInfinitely small angular velocity ratioVariable angular velocity ratioThey have constant angular velocity ratio

23. A gear train consist of spur gear as shown. Gear A receives 4kW of power at 750rpm through its shaft and rotates in CW direction. Calculate the tangential gear tooth force. Module of the gear is 5mm.

510N526NNone of the listed544N

24. If one gear is fixed while the other gear has motion of two types i.e. rotary about its own axis and rotation about axis of fixed gear, than the gear train is _____

Kepler gear trainNone of theseReverted gear trainEpicyclic gear train

25. Velocity ratio is the ratio angular velocity of driving gear to that of driven gear.

MaybeFalseDon't KnowTrue