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. A pair of spur gears consist of 25 teeth pinion meshing with a 115 teeth gear. The module is 5mm. Calculate the pitch circle diameter of the gear.

31mm575mm475mmCannot be determined

2. Sliding contact bearings, also called plain bearings have no problem of wear.

FalseDon't KnowMaybeTrue

3. Bevel gears impose ____ loads on the shafts.

Radial and thrustThrustNeither radial nor thrustRadial

4. If driving gear rotates in CW, then driven gear will rotate in?

CW & ACWCWACWCan’t be determined

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

None of the listedIt may or may not passTrueIt must pass

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

Can’t be determinedYesNo, it is self-aligningIt aligns itself only in some particular cases

7. Lewis form factor is based on real number of teeth.

MaybeTrueDon't KnowFalse

8. Interference is caused by?

Meshing of involute and no-involute profilesLarge size of dedendumOverlapping of tooth profilesAll of these

9. Which of the following have stronger teeth?

Can’t be determinedBoth have equal strengthFull depth teethStub teeth

10. A pair of spur gears consist of 25 teeth pinion meshing with a 115 teeth gear. The module is 5mm. Calculate pitch circle diameter of the pinion.

115mm95mm105mm125mm

11. A radial bearing supports the load that acts along the axis of the shaft.

FalseDon't KnowTrueMaybe

12. A compound gear train consists of at least 3 shafts connected to each other.

TrueFalseDon't KnowMaybe

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

4231

14. A pair of helical gears consist of 25 teeth pinion gear meshing with a 90 teeth gear. Calculate the tangential force If surface hardness is 260BHN. Also face width=35mm, module=4mm and helix angle=25⁰. The velocity of operation is 3.5m/s and service factor 1.5.

3983.71136.5N3226.5N2012.6N

15. Which of the following are functions of bearings?

Ensure free rotation of shaft with minimum frictionTransmit the force of the shaft to the frameAll of the listedHolding shaft in a correct position

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

Don't KnowTrueMaybeFalse

17. If we exclude the cost factor, which bearing is preferred?

Both are equally preferredHydrostaticHydrodynamicCannot be determined

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

TrueFalseDon't KnowMaybe

19. Which of the following statements are not true?

Contact duration is decreased with increase in pressure angleAll of the statements are true20⁰ pressure angle has quieter operation then 14.5⁰Increasing pressure angle improves the tooth strength

20. Hydrodynamic lubrication takes place in which region?

BCCDNone of theseBoth BC and CD

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

YesMaybeDon't KnowNo

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

MaybeDon't KnowTrueFalse

23. Epicyclic gears are not generally recommended due to bulky construction.

FalseTrueMaybeDon't Know

24. Hydrostatic and hydrodynamic lubrication are the same thing.

Don't KnowTrueFalseMaybe

25. Which of the following is measure of stiffness?

ToughnessModulus of elasticityModulus of plasticityResilience