Brakes and Dynamometers topics include: Brakes and dynamometers, band brake, dynamometers types, epicyclic dynamometers and bevis gibson flash light torsion dynamometer. A brake is a mechanical device that absorbs and dissipates mechanical energy as heat. It's used to stop or slow down the motion of a rotating object. A dynamometer is a device that measures mechanical power.  Here are some types of dynamometers: Prony brake: One of the earliest dynamometers, the Prony brake dynamometer has been used for over 200 years to measure engine horsepower. Rope brake dynamometer: A rope is wound... Show more

Brakes and Dynamometers topics include: Brakes and dynamometers, band brake, dynamometers types, epicyclic dynamometers and bevis gibson flash light torsion dynamometer.

A brake is a mechanical device that absorbs and dissipates mechanical energy as heat. It's used to stop or slow down the motion of a rotating object. A dynamometer is a device that measures mechanical power. 

Here are some types of dynamometers:
Prony brake: One of the earliest dynamometers, the Prony brake dynamometer has been used for over 200 years to measure engine horsepower.
Rope brake dynamometer: A rope is wound around a drum attached to the output shaft. One side of the rope is connected to a spring balance, and the other side is attached to a loading device.
Hydraulic dynamometer: Acts as a water brake, using fluid friction to dissipate input energy and measure input torque or power.
Eddy current dynamometer: A subset of chassis dynamometers, eddy current dynamometers can act as brake dynamometers. They can also provide a quick load change rate as well as steady state and controlled acceleration. 

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Machine Dynamics Practice Test: Brakes and Dynamometers

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25 Questions

1. Belt transmission dynamometer is an absorption dynamometer.

TrueDon't KnowFalseMaybe

2. To measure the angle of twist, which of the following device is used in the Bevis-Gibson Flash Light Torsion Dynamometer?

Belt transmission dynamometerProny brake dynamometerTorsion meterRope brake dynamometer

3. If the angle of contact is greater than 60 degrees, then unit pressure normal to the surface of contact is __________

Remains equal at the ends and the centreRemains unaffectedMore at the ends then centreLess at the ends than at the centre

4. For a double block shoe brake, the braking action is halved.

FalseDon't KnowMaybeTrue

5. Prony brake dynamometer is an absorption dynamometer.

MaybeDon't KnowFalseTrue

6. When the shaft is transmitting torque, which of the following phenomenon can cause visibility of light in the eyepiece?

Moving eyepiece greater than the lag amountMoving eyepiece equal to the lag amountMoving eyepiece lesser than the lag amountIndependent of eyepiece position

7. When the shaft is not transmitting torque, which of the following phenomenon occurs?

Visible Flashing of lightTorsion meter stops workingFlashing of light cannot be seenAngle of torsion cannot be measured

8. Which of the following gears is not a part of an epicyclic train dynamometer?

Pinion gearHelical gearSpur gearAnnular gear

9. Belt transmission dynamometer is an absorption dynamometer.

TrueDon't KnowMaybeFalse

10. When the fulcrum is between the two ends of a lever, the type of brake is _____

Differential band brakeDouble block shoe brakeSimple band brakeShoe brake

11. The dead weight at the end of the fulcrum causes rotation of lever about fulcrum.

TrueFalseMaybeDon't Know

12. The lamp and the eye piece must be moved _______ so as to bring them into line.

In opposite planeParallelRadiallyTangentially

13. For a rope brake dynamometer, the flywheel is cooled with soapy water because________

Energy is provided by the motorEnergy is absorbed by the dynamometerEnergy supplied is moreEnergy is used to do work

14. If the friction of the pin on which the pinion rotates is neglected, which of the following force is equal to the tangential effort exerted by the spur gear on the pinion

Tangential reaction of the annular gear on the pinionPiston effortRadial reaction of the annular gear on the pinionRadial effort exerted by the spur gear on the pinion

15. Which of the following is an absorption type dynamometer ?

prony brake dynamometertorsion dynamometerepicyclic-train dynamometernone of these

16. Which of the following dynamometers works on the assumption of uniform density of air?

Torsional dynamometerEpicyclic train dynamometerBevis-Gibson Flash Light Torsion DynamometerBelt transmission

17. For the given figure, the brake can sustain a torque of 350 N-m and coefficient of friction between the band and drum is 0.3, find OA for self locking condition during clockwise rotation.

130mm57mm114mm88mm

18. The capacity of a brake depends upon

The peripheral velocity of the brake drumAll of theseThe unit pressure between the braking surfaces,The coefficient of friction between the braking surfaces,

19. When brakes are applied to all the four wheels of a moving car, the distance travelled by the car before it is brought to rest, will be

maximumequalminimumnone of these

20. Electric brakes are used to control the speed of vehicle during downhill travel.

Don't KnowMaybeFalseTrue

21. The brake shown in figure has a coefficient of friction 0.25 and is to operate using a maximum force F of 500 N. Assume width of the band to be 50 mm, find the braking torque.

320.3 N444.3 N380.2 N357.8 N

22. The material used for the brake lining should have

It should have high heat resistance.It should have low wear rate.All of theseIt should have high heat dissipation capacity.

23. Which of the following dynamometers have a pinion meshing with two gears?

Prony brake dynamometerEpicyclic train dynamometerTorsional dynamometerBelt transmission dynamometer

24. Which of the following dynamometer type differs from an Epicyclic train dynamometer?

Belt transmissionProny brake dynamometerTorsional dynamometerTransmission dynamometer

25. For which of the following dynamometers the driving torque on the shaft is not uniform and it is subjected to severe oscillations?

Epicyclic trainPony brakeBand brakeBelt transmission