Easwari Engineering College.docx

EASWARI ENGINEERING COLLEGE Mapping of Laboratory with current Theory Subject: July 2018 - Dec 2018 Branch: Mechanical Engineering Semester: V Laboratory Code/Name: ME6511 DYNAMICS LABORATORY Name of the Faculty: Mrs. Ramya Suresh, Mr. J. Esakiappan, Mr. B. Elumalai Mapping Subject: Yes/No Subject Code/Name: ME6505 Dynamics of Machines Unit SI. Possible 2 Marks/ viva questions Possible 13 Marks/ viva questions Experiment Name Mapped/ No. (For all experiments) (For all experiments) Not covered 1.Define contact ratio. 2.Define interference. Study of Gear NOT 1 3.What is non standard gear teeth? NIL parameters COVERED 4.What do you know about tumbler gear? 5.What do you know about tumbler gear? Experimental study 1.What is gear train? of speed rate of Spur 2.What are the types of gear trains? Gear,Epicyclic NOT 3.Define Backlash. 2 NIL Gear,Differential COVERED 4.Define simple gear train. Gear, Worm gear 5.What is the advantage of a compound reducer gear train over a simple gear train? 1.Define ‘degrees of freedom’. 2.What is meant by spatial mechanism? Study of four bar NOT 3.What are the some important inversions 3 NIL mechanism COVERED of four chain mechanism? 4.What is pantograph? 5.What is toggle position? 1.Discuss Elliptical trammel 2.Give few examples for kinematics pairs. Kinematics of NOT 4 3.What is movability? NIL Universal Joint COVERED 4.What is meant by transmission angle? 5.What is meant by Ackermann steering?

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1.What is kinematic analysis? 2.What is a cam? To study the 3.Define tangent cam. displacement, motion NOT 4.What are the different follower curve and jump COVERED motions? phenomenon of Cam 5.How can high surface stress in flat faced follower be minimized? Determination of 1.what is meant by momemt of Inertia Mass Moment of 2.define the term radius of Gyration Inertia using Turn NOT 3.what is meant by Equivalent length of Table , COVERED compound pendulum Bifilar,Compound 4.Purpose of Bifillar? pendulum 5. How can we find MOI for Circular disk

Free vibration of Spring mass system

Undamped and Damped Natural and forced frequencies

UNIT 4

1.What are the causes of vibration? 2.Define frequency of vibration. 3.. How will you classify vibration? 4. What is free vibration? 5.Define resonance.

UNIT 4

1.What do you mean by damping and damped vibration? 2.What do you mean by a degree of freedom or movability? 3.Define steady state vibration. 4.List out methods of finding the natural frequency of free longitudinal vibration. 5.Define period and cycle of vibration.

NIL

NIL

1. A spring mass system has spring stiffness of “k” N/m and a mass of “M” kg. It has the natural frequency of vibration as 12 Hz. An extra 2 kg mass is coupled to M and the natural frequency reduces by 2 Hz. Find the values of” k and “M”. 1.A mass of 10 kg is suspended from one end of a helical spring, the other end being fixed. The stiffness of the spring is 10 N/mm. The viscous damping causes the amplitude to decrease to one tenth of the initial value in four complete oscillations. If a periodic force of 150 cos 50 t N is applied at the mass in the vertical direction, find the amplitude of the forced vibrations. What is its value at resonance?

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Determination of Torsional natural frequency of Two rotor system

UNIT 4

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Determination of Whirling of shaft

UNIT 4

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Balancing of Rotating masses

UNIT 2

1. A steel shaft 1.5 m long is 95 mm in diameter for the first 0.6 m of its length, 60 mm in diameter for the next 0.5 m of the length and 50 mm in diameter for the 1.What are transverse vibrations? remaining 0.4 m of its length. The shaft 2.Define transmissibility ratio or isolation carries two flywheels at two ends, the first factor having a mass of 900 kg and 0.85 m radius 3.Define transient vibration. of gyration located at the 95 mm diameter 4.Define amplitude. end and the second having mass of 700 kg 5.What are torsional vibrations? and 0.55 m radius of gyration located at the other end. Determine the location of the node and the natural frequency of free torsional vibration of the system. The modulus of rigidity of the shaft material may be taken as 80 GN/m2. 1.A vertical shaft 25 mm diameter and 1. Define critical or whirling or whipping 0.75 m long, is mounted in long bearings speed of shaft. and carries a pulley of mass 10 kg midway 2. What are the factors that affect the between the bearings. The centre of the critical speed of a shaft? pulley is 0.5 mm from the axis of the 3. What are the causes of critical speed? shaft. Find (a) the Whirling Speed (b) the 4.What is meant by transmissibility? bending stress in the shaft, when it is 5.Define transmissibility ratio. rotating at 1700 rpm 1.Write the importance of balancing? 1.A shaft carries four rotating masses A, 2.Why balancing of dynamic forces are B, C and D which are completely necessary? balanced. The masses B, C and D are 50 3.State the condition for static balancing. kg, 80 kg and 70 kg respectively. The 4.Differentiate static and dynamic masses C and D make angles of 90° and balancing 195° respectively with mass B in the same 5.What are the various cases of balancing sense. The masses A, B, C and D are

revolving masses?

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Motorized Gyroscope- Study of gyroscope effect and couple

UNIT 5

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Watt Governor,Proter Governor,Proell Governor,Hartnell Governor

UNIT 5

concentrated at radius 75 mm, 100 mm, 50 mm and 80 mm respectively. The plane of rotation of masses B and C are 250 mm apart. Determine (i) the magnitudeof mass A and its angular position and (ii) the position planes A 1.A ship is propelled by a turbine rotor which has a mass of 5 tonnes and a speed of 2100 rpm. The rotor has a radius of 1.Give the applications of gyroscopic gyration of 0.5 m and rotates in a couple. clockwise direction when viewed from the 2.Define steering. stern. Find the gyroscopic effect in the 3.Define pitching. following conditions. (i) the ship sails at a 4.Why there is no effect of the gyroscopic speed of 30 km/hr and steers to the left in couple acting on the body of a ship during curve having 60 m radius. (ii) the ship rolling? pitches 6° above and 6° below the 5.Discuss the effect of the gyroscopic horizontal position. The bow is couple on a 2 wheeled vehicle when descending with its maximum velocity. taking a turn. The motion due to pitching is simple harmonic and the periodic time is 20 seconds. (iii) the ship rolls at a certain instant it has an angular velocity of 1.Explain the function of governors. 1.In a Watt governor, the mass of the 2.What is the principle of working of central load is 18 kg and the mass of each centrifugal governors? ball is 2 kg. The top arms are 250 mm 3.What is the principle of inertia while the bottom arms are each 300 mm governors? long. The friction of the sleeve is 14 N. If 4.What is equilibrium speed? the top arms make 45° with the axis of 5.Explain governor effect? rotation in the equilibrium position, find 6.Define power of governor. the range of speed of the governor in that

7.Explain sensitiveness of governors? 8.Define the coefficient of sensitiveness. 9.Explain the term stability of governor? 10.What is controlling force diagram? 11.What is meant by hunting? 12.What are the usesof controlling force diagram? 13.Explain controlling force?

position 2.A porter governor has equal arms each 250 mm long and pivoted on the axis of rotation. Each ball has a mass of 5 kg and the mass of the central load on the sleeve is 25 kg. The radius of rotation of the ball is 150 mm when the3 governor begins to lift and 200 mm when the governor is at maximum speed. Find the minimum and maximum speeds and range of speed of the 3.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 links of 40 mm from the axis of rotation.The extensions of the lower arms to which the balls are attached are 100 mm long and are parallel to the governor axis at the minimum radius. determine the equilibrium speeds corresponding to 4. In a Hartnell governor the lengths of ball and sleeve arms of a bell crank lever are 120 mm and 100 mm respectively. the fulcrum of the bell crank lever is located at 140 mm from the governor axis each governor ball is 4 kg.the governor runs at 5 rps with ball arms vertical and sleeve

arms horizontal the sleeve movement is found to be 10 mm (upwards) for an increase of speed of 4%.find (i) maximum speed if the total sleeve movement is limited to 20 mm (ii) the spring stiffness (iii) sensitiveness of governor

HOD/MECH