B.TECH - Semester 6 dynamics of machinery Question Paper 2013 (apr)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- Define the terms applied and constraint forces.
- Discuss on shaking forces and moments.
- What is the function of a Governor? How does it differ from that of a flywheel?
- Describe the function of a Proell governor with the help of a neat sketch.
- Explain the terms gyroscopic couple, and gyroscopic plane.
- Why is balancing necessary for rotors of high speed engines?
- What do you mean by primary and secondary unbalance in reciprocating engines?
- What is a flywheel? What is its use?
- What are free, damped and forced vibrations?
- Define the terms: Vibration isolation and transmissibility (Answer any one question from each module; each question carries 20 Marks)
- A slider crank mechanism with the following dimensions is acted upon by a force $F=2 \mathrm{kN}$ at $B$ as shown in the figure. $O A=100 \mathrm{~mm}, A B=450 \mathrm{~mm}$. determine the input torque $T$ on the link $O A$ for the static equilibrium...
- (a) State and explain D'Alembert's principle.
- (b) Derive an expression for the angular acceleration of connecting rod of a reciprocating engine.
- Each arm of a Porter governor is 200 mm long and is pivoted on the axis of the governor. The radii of rotation of the ball at the minimum and maximum speeds are 120 mm and 160 mm respectively. The mass of the sleeve is 24 kg and each ball is 4 kg . F...
- The rotor of the turbine of a ship has a mass 2500 kg and rotates at a speed of 3200 rpm counter clockwise when viewed from stem. The rotor has radius of gyration of 0.4 m . determine the gyroscopic couple and its effect when (a) the ship steers to t...
- Four masses $A, B, C$ and $D$ carried by a rotating shaft at radii $80 \mathrm{~mm}, 100 \mathrm{~mm}$, 160 mm and 120 mm respectively are completely balanced. Masses of $B, C$ and D are $8 \mathrm{~kg}, 4 \mathrm{~kg}$ and 3 kg respectively. Determi...
- (a) A flywheel absorbs 24 kJ of energy on increasing its speed of 210 rpm to 214 rpm . Determine its kinetic energy.
- (b) The turning moment diagram for a petrol engine is drawn to a vertical scale of $1 \mathrm{~mm}=50014 \mathrm{Nm}$ and a horizontal scale of $1 \mathrm{~mm}=3^{\circ}$. the turning moment diagram repeats itself after every half revolution of the c...
- A vibrating system consists of a mass of 50 kg , a spring with a stiffness of $30 \mathrm{kN} / \mathrm{m}$ and a damper. The damping provided is only $20 \%$ of the critical value. Determine (a) Damping factor, (b) critical damping coefficient, (c) ...
- A reciprocating IC engine is coupled to a centrifugal pump through a pair of gears. The shaft from the fly wheel of the engine to the gear wheel has a 48 mm diameter and is 800 mm long. The shaft from the pinion to the pump has 32 mm diameter and is ...