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. 

Show less

Machine Dynamics Practice Test: Turning Moment Diagrams and Flywheel

Time left 00:00

25 Questions

1. An Internal combustion engine has a connecting rod of mass 2 kg and the distance between the centre of crank and centre of gudgeon pin is 25 cm. The Center of Gravity lies at a point 10 cm from the gudgeon pin along the line of centres. The radius of gyration of this system about an axis through the Center of Gravity perpendicular to the plane of rotation is 11 cm. Find the mass located at gudgeon pin in Kg.

0.91.20.81.1

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

4/33/23/41

3. The cross-section of the flywheel arms is usually

ellipticalI-sectionrectangularL-section

4. 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?

56.552.759.549.5

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

Dynamic equilibriumStable equilibriumUnstable equilibriumStatic equilibrium

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

cpbq

7. If E = Mean kinetic energy of the flywheel, C_S = Coefficient of fluctuation of speed and Δ E = Maximum fluctuation of energy, then

ΔE = E2 × CSΔE = E / CSΔE = 2 E × CSΔE = E × CS

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

The gasesPiston wallOn the gasesValve

9. 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 angular acceleration of connecting rod in rad/s².

16.78217.82415.14217.161

10. The sum of torques required to accelerate a 2 mass system and to accelerate a rigid body is called correction couple.

Don't KnowMaybeFalseTrue

11. For a 4 cylinder engine, when the pressure inside the cylinders exceeds the atmospheric pressure then.

Work is done by the piston wallWork is done on the piston wallWork is done by the gasesWork is done on the gases

12. Force which does not act on the connecting rod is ______

Coriolis forceInertia force of connecting rodWeight of connecting rodRadial force

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

MaybeTrueFalseDon't Know

14. The tensile stress in the flywheel rim due to the centrifugal force acting on the rim is given by

3ρ v2/4ρ v2ρ v2/2ρ v2/4

15. Coefficient of fluctuation is the ratio of ______

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

16. Coefficient of fluctuation of energy is ratio of _______

Maximum fluctuation energy to work done per cycleMinimum fluctuation energy to work done per cycleMean fluctuation energy to work done per cycleMean fluctuation energy to power generated per cycle

17. Mass moment of inertia of two arbitrary masses placed will be same as the mass moment inertia of the rigid body.

FalseTrueMaybeDon't Know

18. Which of the following statement is wrong?

None of theseThe difference between the maximum and minimum energies is called maximum fluctuation of energy.The variations of energy above and below the mean resisting torque line is known as fluctuation of energy.The co-efficient of fluctuation of speed is the ratio of maximum fluctuation of speed to the mean speed.

19. The coefficient of fluctuation of speed is the _____________ of maximum fluctuation of speed and the mean speed.

ratioproductsumdifference

20. When the work is done on the gases, which of the following effect is observed on the turning moment diagram?

Formation of negative loopFormation of positive loopFormation of no loopFormation of an infinite loop

21. In the figure given below, the areas BbC, CcD represent _______

Power lostChange in momentumPower generatedFluctuation of energy

22. The diameter of the hub of the flywheel is usually taken

twice the diameter of the shaftthree times the diameter of the shaftequal to the diameter of the shaftfour times the diameter of the shaft

23. The moment of inertia of a flywheel is 6500 kg-m², from the turning moment diagram, it is found that fluctuation of energy is 56000 N-m, if mean speed is 120 rpm, then find maximum speed.

121118119122

24. 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 endscantilever beam fixed at the hub and carrying a concentrated load at the free end of the rimnone of these

25. Consider a three cylinder engine, the resultant turning moment diagram is the _____ of three cylinders.

DifferenceIndependentSumProduct