B.TECH - Semester 6 dynamics of machinery Question Paper 2020 (sep)
Practice authentic previous year university questions for better exam preparation.
- A vibrating system consists of a mass 5 kg , a spring of stiffness $k=80 \mathrm{~N} / \mathrm{m}$. damper with $\mathrm{c}=3 \mathrm{~N} \mathrm{sec} / \mathrm{m}$ determine (a) Logarithmic decrement
- A vibrating system consists of a mass 5 kg , a spring of stiffness $k=80 \mathrm{~N} / \mathrm{m}$. damper with $\mathrm{c}=3 \mathrm{~N} \mathrm{sec} / \mathrm{m}$ determine (b) The damping factor
- A vibrating system consists of a mass 5 kg , a spring of stiffness $k=80 \mathrm{~N} / \mathrm{m}$. damper with $\mathrm{c}=3 \mathrm{~N} \mathrm{sec} / \mathrm{m}$ determine (c) Natural frequency of damped vibration
- A vibrating system consists of a mass 5 kg , a spring of stiffness $k=80 \mathrm{~N} / \mathrm{m}$. damper with $\mathrm{c}=3 \mathrm{~N} \mathrm{sec} / \mathrm{m}$ determine (d) Ratio between two consecutive amplitudes.
- Four masses M1, M2, M3 and M4 have their radii of rotation and masses are $200 \mathrm{~mm}, 150 \mathrm{~mm}, 250 \mathrm{~mm}, 300 \mathrm{~mm}$, and $200 \mathrm{~kg} .300 \mathrm{~kg}, 240 \mathrm{~kg}, 260 \mathrm{~kg}$ respectively. Angle between successive masses are $45^{\circ}, 75^{\circ}$ ...
- Define coefficient of fluctuation of speed and coefficient of fluctuation of energy.
- For a Hartnell governor ball mass is 1.4 kg Length of ball arm is 100 mm and length of sleeve arm is 50 mm . The distance of the fulcrum of bell crank lever from the axis of rotation is 80 mm . The extreme radii of rotation of the balls are 75 mm and 112.5 mm . The maximum equilibrium speed is $6 \%...
- Differentiate governor from flywheel.
- Illustrate the use of space diagram and free body diagram with an example.
- Write the equations for static equilibrium in three dimensions.
- What is meant by a dynamically equivalent system? State the conditions for dynamic equivalence.
- Derive the condition for isochronism for a Hartnell governor.
- Derive the expression for the gyroscopic couple $\mathrm{C}=I \omega \omega_{p}$.
- State the conditions for balancing of several masses rotating in the same plane.
- What is meant by Coulomb damping? Mention sonic applications of it.
- What is meant by a torsionally equivalent shaft? Derive an expression of it. ( $\mathbf{1 0} \boldsymbol{\times} \mathbf{4} \boldsymbol{=} \mathbf{4 0}$ Marks) P.T.O. Answer one questions from each Module.
- The crank of a slider crank mechanism rotates at 300 rpm . Crank is 150 mm and connecting rod is 600 mm long. The crank makes 45 degree with the IDC and rotates clockwise. Determine velocity of the piston and angular velocity of the connecting rod graphically.
- When the crank is $45^{\circ}$ from the IDC on the down stroke, the effective gas pressure on the piston of a vertical engine is $250 \mathrm{KN} / \mathrm{M}^{2}$. The diameter of the cylinder is 75 cm , stroke is 50 cm , length of the connecting rod is 100 cm . Determine the torque on the crank sh...
- A reciprocating engine is coupled to a centrifugal pump through gearing. The shaft from flywheel to gear is 6 cm diameter and 1.2 m long. Shaft from pinion to pump is 4 cm diameter and 30 cm long. Gear ratio is $1 / 3$. Moment of inertia of flywheel, gear, pinion, pump are $700 \mathrm{~kg}-\mathrm{...
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