Bevel Gears, Worm Gears and FlyWheel topics: Bevel gears and its terminology, bevel gear strength, worm gears and flywheel coefficient. Some differences between bevel gears, worm gears, and flywheels are: Bevel gears: These gears have angular gear teeth and use the entire width of the interlocking teeth to transmit force. They are used to transfer mechanical energy or shaft power between intersecting shafts, either perpendicular or at an angle. Bevel gears are often mounted on shafts that are 90 degrees apart, but can be designed to work at other angles. Worm gears: These gears are made up... Show more

Bevel Gears, Worm Gears and FlyWheel topics: Bevel gears and its terminology, bevel gear strength, worm gears and flywheel coefficient.

Some differences between bevel gears, worm gears, and flywheels are:
Bevel gears: These gears have angular gear teeth and use the entire width of the interlocking teeth to transmit force. They are used to transfer mechanical energy or shaft power between intersecting shafts, either perpendicular or at an angle. Bevel gears are often mounted on shafts that are 90 degrees apart, but can be designed to work at other angles.
Worm gears: These gears are made up of a worm wheel and a worm shaft with worm gears. Worm gears transfer movement load at right angles with a sliding effect instead of a rolling motion. Worm gears are found in right angle gearboxes.
Flywheels: These are rotating machine elements that store energy.

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

Show less

Machine Design Practice Test: Bevel Gears, Worm Gears and FlyWheel

Time left 00:00

25 Questions

1. Which of the following are characteristics of skew bevel gears?

Mounted on intersecting shaftsStraight teethAll of theseMounted on parallel shafts

2. A pair of worm gear is written as 2/40/12/6. Calculate the pitch circle diameter of worm wheel.

260mm240mm320mm72mm

3. Can worm gears be used in steering mechanism?

FalseMaybeDon't KnowTrue

4. Beam strength of the bevel gear is independent of the cone distance.

Don't KnowMaybeTrueFalse

5. If service factor is 1.4 & tangential ad dynamic load is 1180N and 1500N respectively, then calculate the effective load.

3152N2889N3662N2236N

6. Calculate the radial component of gear tooth force if power transmitted is 6kW and diameters of pinion and gear are 150mm and 210 mm with face width of tooth being 35mm. Power is transmitted at 3000rpm. Also pressure angle is 20⁰.

489.2N332.6N739.2N996.6N

7. When the pitch angle is greater than 90⁰, it is called external bevel gear.

InternalHelicalTrueHerringbone

8. The turning moment diagram of a multi cylinder engine is shown below. The intercepted areas between torque developed by the engine and the mean resisting torque of the machine taken in order from one end are -300,+850 -500, + 900, -550, + 430 and -700 mm². Calculate the point of minimum energy.

U-450U-300U+650U+480

9. Hypoid gears have the following characteristics.

Mounted on non -parallel non intersecting shaftsEfficiency of 97%Curved teethAll of these

10. If worm helix angle is 30⁰, then worm should have at least ___ threads.

8765

11. If pitch angle and addendum angles are 5⁰ and 12⁰ respectively, then face angle is equal to?

5⁰7⁰12⁰17⁰

12. The worm helix angle is the _____ of the worm lead angle.

DoubleHalfSupplementComplement

13. The point where angular velocity is maximum is?

ACDB

14. A pair of worm gear is written as 2/40/12/6. Calculate the throat diameter of the worm wheel.

251.7mm246.4mm190.44mm220.5mm

15. Straight bevel gears are easy to design and manufacture and give reasonably good service with quieter operation.

No, noise problemNo, vibration problemTrueNone of the listed

16. Calculate the radius of pinion at midpoint along the face width if PCD of pinion is 150mm and of gear is 210mm. Also face width of the tooth is 35mm.

56.35mm64.83mm66.57mm58.69mm

17. The following is a work cycle graph for a flywheel. T₂ is the torque supplied by motor while T₁ and T₃ are the torques required by machine. The flywheel is accelerated during the

ABBCBoth AB and CDCD

18. The wear strength indicates the maximum value of radial force at the large end of the tooth that the tooth can transmit without pitting failure.

TrueMaybeDon't KnowFalse

19. Is it possible to use worm gears in cranes for lifting purpose?

None of the listedPossible up to a threshold loadTrueNo self-locking and hence not possible

20. The power transmitting capacity of worm gears is high although efficiency is low.

FalseMaybeDon't KnowTrue

21. Calculate the cone distance of in a pair of bevel gears if pitch circle diameter of pinion and gear are 20mm and 24mm respectively.

15.6mm22mm20.2mm44mm

22. The pinion of a face gear is a

Helical gearEither spur or helicalNone of theseSpur gear

23. Which of the following is not true about worm gears?

Low speed reductionSmooth and silent operationAll the mentioned are trueCompact

24. If load on the engine is constant, the mean speed will be constant and ___ will not operate.

None of theseBoth flywheel and governorFlywheelGovernor

25. Crown gears having a pitch angle of 90⁰ are mounted on shafts intersecting at an angle

<90>90None of the listed=90