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

In opposite planeTangentiallyParallelRadially

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

Prony brake dynamometerEpicyclic train dynamometerTorsional dynamometerBelt transmission dynamometer

3. The capacity of a brake depends upon

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

4. The brake commonly used in motor cars is

internal expanding brakeband and block brakeband brakeshoe brake

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

Energy supplied is moreEnergy is absorbed by the dynamometerEnergy is used to do workEnergy is provided by the motor

6. The upward force is balanced by ________

Radial reaction of the annular gear on the pinionDead weightRadial effort exerted by the spur gear on the pinionTangential reaction of the annular gear on the pinion

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

none of theseepicyclic-train dynamometertorsion dynamometerprony brake dynamometer

8. Light is visible when the torque is being transmitted by the shaft.

MaybeTrueDon't KnowFalse

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

Spur gearAnnular gearHelical gearPinion gear

10. The transmission type of dynamometer is a

prony brake dynamometernone of thesetorsion dynamometerepicyclic-train dynamometer

11. Braking torque is independent of the radius of drum.

MaybeFalseTrueDon't Know

12. 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.

88mm57mm130mm114mm

13. Prony brake dynamometer is an absorption dynamometer.

Don't KnowTrueMaybeFalse

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

Torsional dynamometerProny brake dynamometerTransmission dynamometerBelt transmission

15. To prevent the rotation caused by frame, which of the following quantity is added?

Welded jointsWeight at the centreWeight at a distanceBall bearings

16. 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 necessary force required for clockwise rotation of the drum in N.

128326496

17. Which of the following is a function of a belt transmission dynamometer?

Measuring frictionMeasuring power of an engineMeasuring speed of an engineMeasure the difference in tension of the belts

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

Belt transmissionBand brakePony brakeEpicyclic train

19. With the help of following data, calculate the braking torque in N-m.
T₁ = 2500 N
T₂ = 200 N
diameter of drum = 350mm

560805201.5402.5

20. The material used for the brake lining should have

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

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

Torsion meterProny brake dynamometerRope brake dynamometerBelt transmission dynamometer

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

Shoe brakeDifferential band brakeSimple band brakeDouble block shoe brake

23. Belt transmission dynamometer is a transmission dynamometer.

Don't KnowMaybeTrueFalse

24. Belt transmission dynamometer is an absorption dynamometer.

TrueMaybeFalseDon't Know

25. On which of the following factor, the power of a torsion dynamometer does not depend?

TorqueAngle of twistSpeedFriction