Turning Moment Diagrams and Flywheel topics include: Energy fluctuation, flywheel and its energy storage, coefficient of speed and energy fluctuation, turning moment diagram for single and multi cylinder engine and also four stroke cycle combustion engine. A turning moment diagram, also known as a crank effort diagram, is a graphical representation of the relationship between the turning moment and the crank angle at various crank positions. It can be used to design a flywheel for an engine to minimize crank speed variance during each cycle.  A flywheel is a mechanical device that stores... Show more

Turning Moment Diagrams and Flywheel topics include: Energy fluctuation, flywheel and its energy storage, coefficient of speed and energy fluctuation, turning moment diagram for single and multi cylinder engine and also four stroke cycle combustion engine.

A turning moment diagram, also known as a crank effort diagram, is a graphical representation of the relationship between the turning moment and the crank angle at various crank positions. It can be used to design a flywheel for an engine to minimize crank speed variance during each cycle. 

A flywheel is a mechanical device that stores energy in the form of rotational momentum. Torque can be applied to a flywheel to cause it to spin, increasing its rotational momentum. This stored momentum can then be used to apply torque to any rotating object, most commonly machinery or motor vehicles. 
The turning moment diagram can also be used to determine the fluctuation of energy for one complete cycle of operation. 

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Machine Dynamics Practice Test: Turning Moment Diagrams and Flywheel

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25 Questions

1. To calculate power generated, product of maximum torque and angular speed is taken.

MaybeFalseDon't KnowTrue

2. In order to find the maximum bending moment on the arms, it is assumed as a

simply supported beam carrying a uniformly distributed load over the armfixed at both ends (i.e. at the hub and at the free end of the rim) and carrying a uniformly distributed load over the arm.cantilever beam fixed at the hub and carrying a concentrated load at the free end of the rimnone of these

3. From the turning moment diagram shown below, the minimum speed will occur at point _____

qpbc

4. In a four stroke I.C. engine, the turning moment during the compression stroke is

negative during major portion of the strokenegative throughoutpositive during major portion of the strokepositive throughout

5. 4 strokes engine have a lower thermal efficiency than 2 stroke engine.

FalseTrueDon't KnowMaybe

6. 4-stroke engine has one power stroke per 2 revolutions hence turning moment diagram is uniform.

TrueDon't KnowMaybeFalse

7. For a 4 cylinder engine, if the minimum speed of the engine is half the maximum speed, then coefficient of fluctuation is _________

21.50.50.66

8. In a punching press, load is 0 at the time of punching.

TrueDon't KnowMaybeFalse

9. The ratio of the maximum fluctuation of energy to the ___________ is called coefficient of fluctuation of energy.

none of theseworkdone per cyclecoefficient of fluctuation of energyminimum fluctuation of energy

10. When mass of the reciprocating parts is neglected then the inertia force is _____

Not defined0MaximumMinimum

11. If the mean speed is 3/4^th of the maximum speed, the coefficient of steadiness is ______

3/43/214/3

12. In the turning moment diagram of a multicylinder engine, the work done during exhaust stroke is by ______

ValveOn the gasesPiston wallThe gases

13. In order to reduce the heavy weight of the flywheel which of the following mechanical component is used?

BearingsGearsEngineShaft

14. From the data given:
Piston diameter = 0.24 m, length of stroke = 0.6 m, length of connecting rod = 1.5 m, mass of reciprocating parts = 300 kg, mass of connecting rod = 250 kg; speed of rotation = 125 r.p.m ; centre of gravity of connecting rod from crank pin = 0.5 m ; Kg of the connecting rod about an axis through the centre of gravity = 0.65 m
Find the correcting couple in N-m?

49.556.559.552.7

15. Area of the turning moment diagram represents _______

Work doneWork done per revolutionPower generated per revolutionPower generated

16. If the minimum speed of the engine is half the maximum speed, then coefficient of fluctuation is _____

0.521.50.66

17. Correction couple is applied when masses are placed arbitrarily and to maintain _________

Unstable equilibriumStatic equilibriumDynamic equilibriumStable equilibrium

18. Coefficient of fluctuation is the ratio of ______

The maximum speed to the mean speedThe minimum fluctuation of speed to the mean speedThe minimum speed to the maximum speedThe maximum fluctuation of speed to the mean speed

19. Maximum fluctuation of energy in a flywheel is equal to

2ECSIω(ω1 – ω2)all of theseIω2CS

20. If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be

one and a half times the first oneone fourth of the first onefour times the first onesame as the first one

21. The relation between stroke punch s and radius of crank r is ______

s=2rs=rs=4rs=r/2

22. When the flywheel absorbs energy, its speed ________

Remains unaffectedGoes down to 0IncreasesDecreases

23. The curve cde in figure below is known as _________

InstrokePositive coupleNegative coupleOutstroke

24. For a multicylinder engine, the coefficient of fluctuation of speed would vary with _________

Remains unaffectedLength of connecting rodNumber of cylindersInput temperature

25. Multi cylinder engines are usually placed at an equal inclination to each other.

FalseMaybeTrueDon't Know