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Machine Dynamics Practice Test: Turning Moment Diagrams and Flywheel
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Avg score: 82% • Most missed: “Consider a three cylinder engine, the resultant turning moment diagram is the __…”
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
Machine Dynamics Practice Test: Turning Moment Diagrams and Flywheel
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25 Questions

1. Maximum fluctuation of energy in a flywheel is equal to
2. Consider a three cylinder engine, the resultant turning moment diagram is the _____ of three cylinders.
3. Correction couple is applied when masses are placed arbitrarily and to maintain _________
4. The diameter of the hub of the flywheel is usually taken
5. Due to the centrifugal force acting on the rim, the flywheel arms will be subjected to
6. A machine punching 38 mm holes in 32 mm thick plate requires 7 N-m of energy per sq. mm of sheared area, find the maximum shear force required.
7. Work produced by the 4-stroke engine is less because _______
8. The main function of a flywheel is to cause variations in the speed of a shaft caused by torque fluctuations.
9. Torque due to weight of the connecting rod affects the torque due to connecting rod.
10. 4-stroke engine has one power stroke per 2 revolutions hence turning moment diagram is uniform.
11. If the minimum speed of the engine is half the maximum speed, then coefficient of fluctuation is _____
12. The coefficient of fluctuation of speed is the _________ of maximum fluctuation of speed and the mean speed.
13. For a multicylinder engine, 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.
14. Force which does not act on the connecting rod is ______
15. A negative loop is formed in the turning moment diagram because the pressure inside the cylinder is _______ than the atmospheric pressure.
16. In order to find the maximum bending moment on the arms, it is assumed as a
17. Coefficient of fluctuation is the ratio of ______
18. In a four stroke I.C. engine, the turning moment during the compression stroke is
19. The tensile stress in the flywheel rim due to the centrifugal force acting on the rim is given by
20. In a turning moment diagram, the variations of energy above and below the mean resisting torque line is called
21. The ratio of maximum fluctuation of energy to the workdone per cycle is called
22. In order to find the maximum bending moment on the arms, it is assumed as a
23. Turning moment is maximum when the crank angle is 90 degrees.
24. 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.
25. A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by

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