B.TECH - Semester 6 dynamics of machinery Question Paper 2020 (jan)
Practice authentic previous year university questions for better exam preparation.
- The turning moment diagram of a four stroke engine is assumed to be represented by four triangles, the areas of which from the line of zero pressure are: suction stroke $440 \mathrm{~mm}^{2}$ compression stroke $1600 \mathrm{~mm}^{2}$. expansion stroke $7200 \mathrm{~mm}^{2}$ and exhaust stroke $660...
- Define the terms: Coefficient of fluctuation of energy and coefficient of fluctuation of speed.
- What is meant by static and dynamic unbalance in machinery?
- Differentiate between longitudinal and transverse vibrations.
- A four bar mechanism with the following dimensions is acted upon by a force $80 \angle 150^{\circ} \mathrm{N}$ on the link DC as shown in the figure. $\mathrm{AD}=500 \mathrm{~mm}, \mathrm{AB}=400 \mathrm{~mm}$, $B C=1000 \mathrm{~mm}$ and $D C=750 \mathrm{~mm}$. Determine the input torque on the li...
- The mass of each ball of a Proell governor is 7.5 kg and the load on the sleeve.is 80 kg . Each of the arms is 300 mm long. The upper arms are pivoted on the axis of rotation whereas the lower arms are pivoted to a link 40 mm from the axis of rotation. The extensions of the lower arms to which the b...
- A 2.2 tonne racing car has a wheel base 2.4 m and a track of 1.4 m The centre of mass of the car lies at 0.6 m above the ground and 1.4 m from the rear axle. The equivalent mass of engine parts is 140 kg with a radius of gyration of 150 mm . The back axle ratio is 5 . The engine shaft and flywheel r...
- State the conditions for a body to be in equilibrium under the action of three forces.
- What do you mean by dynamical equivalent system? Explain.
- Distinguish between Porter governor and Watt governor.
- Define the terms: Isocronism, and Controlling Force of a governor.
- Explain the terms spin and precession as applicable to gyroscope.
- State the expression for primary and secondary accelerating forces in a reciprocating engine.
- What do you mean by whirling of shafts? What is critical/whirling speed? Explain. Answer any one questions from each Module. each question carries 20 marks.
- (a) Specify the steps followed for dynamic analysis of four-bar mechanisms.
- (b) Derive an expression for velocity and acceleration of piston of a reciprocating engine.
- The stroke of each piston of a six-cylinder two-stroke in-line engine is 320 mm and the connecting rod is 800 mm long. The cylinder centre lines are spaced at 500 mm . The cranks are at $60^{\circ}$ apart and the firing order is 145236. The reciprocating mass per cylinder is 100 kg and the rotating ...
- A machine mounted on springs and fitted with a dashpot has a mass of 60 kg . There are three springs, each of stiffness $12 \mathrm{~N} / \mathrm{mm}$. The amplitude of vibrations reduces from 45 to 8 mm in two complete oscillations. Assuming that the damping force varies as the velocity, determine ...
- A shaft carries two masses $A$ and $B$ as shown in the figure. The mass $A$ is 300 kg with a radius of gyration of 0.75 m and mass $B$ is 500 kg with radius of gyration of 0.9 mm . Determine the frequency of torsional vibrations. It is desired to have the node at the mid-section of the shaft of 120 ...
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