Code No: R05320304
R05
Set No. 2
in
III B.Tech II Semester Supplementary Examinations,May 2010 DYNAMICS OF MACHINERY Common to Mechanical Engineering, Mechatronics, Production Engineering, Automobile Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
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1. (a) Draw the turning moment diagram for a four stroke cycle internal combustion engine.
or
(b) A single cylinder four stroke cycle engine develops 15 kW Power at 330 rpm. The maximum fluctuation of energy is 80% of the indicated energy per cycle .The engine is connected through a gearing to a machine having a speed of 726 rpm .the moment of inertia of rotating parts of the engine is 104 kg-m2 and that of the machine is 9.5 kg-m2 . Determine the weight of additional flywheel that will be required to keep the overall range of speed variation to 0.75% of mean speed. Radius of gyration of the flywheel is 0.45 m. [6+10]
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2. A rotating shaft carries four masses 1, 2, 3 and 4 which are radially attached to it. The mass centres are 3 cm, 3.8 cm, 4 cm and 3.5 cm respectively from the axis of rotation. The masses 1, 3 and 4 are 7.5 kg, 8 kg and 5 kg respectively. The axial distances between 2 and 3 is 40 cm and between 1 and 3 is 15 cm. The masses 1 and 3 are at right angles to each other. Find for complete balance. (a) The angles between the masses 1, 2 and 4. (b) Axial distance between the planes of rotation of 3 and 4. (c) The magnitude of mass 2.
[16]
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3. Three cylinders of an air compressor have their axes at 1200 to one another and their connecting rods are coupled to a simple crank. The stroke is 12cms and the length of each connecting rod is 16cms.. Determine the primary and secondary forces. Mass of the reciprocating parts per cylinder = 1.5kg The engine Speed= 3000rpm. [16]
4. Explain two rotor and three rotor vibrations.
[16]
5. (a) What is a friction circle? Derive an expression for its radius. (b) A screw jack has a square thread of mean diameter 6 cm and pitch 0.8 cm. the coefficient of friction at the screw thread is 0.09. A load of 3kN is to be lifted through 12 cm. Determine the torque required and the work done in lifting the load through 12 cm. Find the efficiency of the jack also. [4+12]
6. Write short notes on the following: 1
Code No: R05320304
R05
Set No. 2
(a) Self-locking in band brakes. (b) heenan and froude water vortex dynamometer. (c) Swinging field dynamometer.
[16]
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in
7. Each ball of a Hartnell governor is attached to one arm of bell crank lever. The other arm of each lever presses against the sleeve and lifts it against the force exerted by a spring in compression which surrounds the governor spindle. The pivots of the bell crank levers are fixed to the spindle at a radius of 8.5cm. The length of ball and sleeve arms of each lever are 16cm & 8cm respectively. The two arms are at right angles. Each ball weighs 20 N. the stiffness of the spring is 40KN/m. when the ball arms are parallel to the governor spindle, the equilibrium speed is 300rpm. Find the sleeve lift for an 8% increase in speed. [16] 8. (a) Draw the friction axes of the coupler of four bar mechanism.
or
(b) In a slider crank mechanism the crank is making an angle of 600 with IDC. The crank and connecting rod lengths are 100mm and 300mm respectively. Determine the driving torque on crank if the force of 2KN is applied on the slider. [4+12]
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2
Code No: R05320304
R05
Set No. 4
1. Explain two rotor and three rotor vibrations.
in
III B.Tech II Semester Supplementary Examinations,May 2010 DYNAMICS OF MACHINERY Common to Mechanical Engineering, Mechatronics, Production Engineering, Automobile Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? [16]
ld .
2. (a) What is a friction circle? Derive an expression for its radius.
3. Write short notes on the following: (a) Self-locking in band brakes.
or
(b) A screw jack has a square thread of mean diameter 6 cm and pitch 0.8 cm. the coefficient of friction at the screw thread is 0.09. A load of 3kN is to be lifted through 12 cm. Determine the torque required and the work done in lifting the load through 12 cm. Find the efficiency of the jack also. [4+12]
(b) heenan and froude water vortex dynamometer.
[16]
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(c) Swinging field dynamometer.
nt
4. Each ball of a Hartnell governor is attached to one arm of bell crank lever. The other arm of each lever presses against the sleeve and lifts it against the force exerted by a spring in compression which surrounds the governor spindle. The pivots of the bell crank levers are fixed to the spindle at a radius of 8.5cm. The length of ball and sleeve arms of each lever are 16cm & 8cm respectively. The two arms are at right angles. Each ball weighs 20 N. the stiffness of the spring is 40KN/m. when the ball arms are parallel to the governor spindle, the equilibrium speed is 300rpm. Find the sleeve lift for an 8% increase in speed. [16]
Aj
5. A rotating shaft carries four masses 1, 2, 3 and 4 which are radially attached to it. The mass centres are 3 cm, 3.8 cm, 4 cm and 3.5 cm respectively from the axis of rotation. The masses 1, 3 and 4 are 7.5 kg, 8 kg and 5 kg respectively. The axial distances between 2 and 3 is 40 cm and between 1 and 3 is 15 cm. The masses 1 and 3 are at right angles to each other. Find for complete balance. (a) The angles between the masses 1, 2 and 4.
(b) Axial distance between the planes of rotation of 3 and 4. (c) The magnitude of mass 2.
[16]
6. Three cylinders of an air compressor have their axes at 1200 to one another and their connecting rods are coupled to a simple crank. The stroke is 12cms and the length of each connecting rod is 16cms.. Determine the primary and secondary forces. 3
Code No: R05320304
R05
Set No. 4
Mass of the reciprocating parts per cylinder = 1.5kg The engine Speed= 3000rpm.
[16]
7. (a) Draw the turning moment diagram for a four stroke cycle internal combustion engine.
ld .
in
(b) A single cylinder four stroke cycle engine develops 15 kW Power at 330 rpm. The maximum fluctuation of energy is 80% of the indicated energy per cycle .The engine is connected through a gearing to a machine having a speed of 726 rpm .the moment of inertia of rotating parts of the engine is 104 kg-m2 and that of the machine is 9.5 kg-m2 . Determine the weight of additional flywheel that will be required to keep the overall range of speed variation to 0.75% of mean speed. Radius of gyration of the flywheel is 0.45 m. [6+10] 8. (a) Draw the friction axes of the coupler of four bar mechanism.
or
(b) In a slider crank mechanism the crank is making an angle of 600 with IDC. The crank and connecting rod lengths are 100mm and 300mm respectively. Determine the driving torque on crank if the force of 2KN is applied on the slider. [4+12]
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nt
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4
Code No: R05320304
R05
Set No. 1
1. (a) Draw the friction axes of the coupler of four bar mechanism.
in
III B.Tech II Semester Supplementary Examinations,May 2010 DYNAMICS OF MACHINERY Common to Mechanical Engineering, Mechatronics, Production Engineering, Automobile Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
ld .
(b) In a slider crank mechanism the crank is making an angle of 600 with IDC. The crank and connecting rod lengths are 100mm and 300mm respectively. Determine the driving torque on crank if the force of 2KN is applied on the slider. [4+12]
or
2. (a) Draw the turning moment diagram for a four stroke cycle internal combustion engine.
uW
(b) A single cylinder four stroke cycle engine develops 15 kW Power at 330 rpm. The maximum fluctuation of energy is 80% of the indicated energy per cycle .The engine is connected through a gearing to a machine having a speed of 726 rpm .the moment of inertia of rotating parts of the engine is 104 kg-m2 and that of the machine is 9.5 kg-m2 . Determine the weight of additional flywheel that will be required to keep the overall range of speed variation to 0.75% of mean speed. Radius of gyration of the flywheel is 0.45 m. [6+10] 3. Explain two rotor and three rotor vibrations.
[16]
4. Write short notes on the following: (a) Self-locking in band brakes.
nt
(b) heenan and froude water vortex dynamometer. (c) Swinging field dynamometer.
[16]
5. (a) What is a friction circle? Derive an expression for its radius.
Aj
(b) A screw jack has a square thread of mean diameter 6 cm and pitch 0.8 cm. the coefficient of friction at the screw thread is 0.09. A load of 3kN is to be lifted through 12 cm. Determine the torque required and the work done in lifting the load through 12 cm. Find the efficiency of the jack also. [4+12]
6. Each ball of a Hartnell governor is attached to one arm of bell crank lever. The other arm of each lever presses against the sleeve and lifts it against the force exerted by a spring in compression which surrounds the governor spindle. The pivots of the bell crank levers are fixed to the spindle at a radius of 8.5cm. The length of ball and sleeve arms of each lever are 16cm & 8cm respectively. The two arms are at right angles. Each ball weighs 20 N. the stiffness of the spring is 40KN/m. when 5
Code No: R05320304
R05
Set No. 1
the ball arms are parallel to the governor spindle, the equilibrium speed is 300rpm. Find the sleeve lift for an 8% increase in speed. [16]
(a) The angles between the masses 1, 2 and 4. (b) Axial distance between the planes of rotation of 3 and 4.
[16]
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(c) The magnitude of mass 2.
in
7. A rotating shaft carries four masses 1, 2, 3 and 4 which are radially attached to it. The mass centres are 3 cm, 3.8 cm, 4 cm and 3.5 cm respectively from the axis of rotation. The masses 1, 3 and 4 are 7.5 kg, 8 kg and 5 kg respectively. The axial distances between 2 and 3 is 40 cm and between 1 and 3 is 15 cm. The masses 1 and 3 are at right angles to each other. Find for complete balance.
or
8. Three cylinders of an air compressor have their axes at 1200 to one another and their connecting rods are coupled to a simple crank. The stroke is 12cms and the length of each connecting rod is 16cms.. Determine the primary and secondary forces. Mass of the reciprocating parts per cylinder = 1.5kg The engine Speed= 3000rpm. [16]
Aj
nt
uW
?????
6
Code No: R05320304
R05
Set No. 3
1. (a) What is a friction circle? Derive an expression for its radius.
in
III B.Tech II Semester Supplementary Examinations,May 2010 DYNAMICS OF MACHINERY Common to Mechanical Engineering, Mechatronics, Production Engineering, Automobile Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
2. Explain two rotor and three rotor vibrations.
ld .
(b) A screw jack has a square thread of mean diameter 6 cm and pitch 0.8 cm. the coefficient of friction at the screw thread is 0.09. A load of 3kN is to be lifted through 12 cm. Determine the torque required and the work done in lifting the load through 12 cm. Find the efficiency of the jack also. [4+12] [16]
uW
or
3. Each ball of a Hartnell governor is attached to one arm of bell crank lever. The other arm of each lever presses against the sleeve and lifts it against the force exerted by a spring in compression which surrounds the governor spindle. The pivots of the bell crank levers are fixed to the spindle at a radius of 8.5cm. The length of ball and sleeve arms of each lever are 16cm & 8cm respectively. The two arms are at right angles. Each ball weighs 20 N. the stiffness of the spring is 40KN/m. when the ball arms are parallel to the governor spindle, the equilibrium speed is 300rpm. Find the sleeve lift for an 8% increase in speed. [16] 4. Write short notes on the following: (a) Self-locking in band brakes.
(b) heenan and froude water vortex dynamometer. [16]
nt
(c) Swinging field dynamometer.
5. (a) Draw the friction axes of the coupler of four bar mechanism.
Aj
(b) In a slider crank mechanism the crank is making an angle of 600 with IDC. The crank and connecting rod lengths are 100mm and 300mm respectively. Determine the driving torque on crank if the force of 2KN is applied on the slider. [4+12]
6. (a) Draw the turning moment diagram for a four stroke cycle internal combustion engine. (b) A single cylinder four stroke cycle engine develops 15 kW Power at 330 rpm. The maximum fluctuation of energy is 80% of the indicated energy per cycle .The engine is connected through a gearing to a machine having a speed of 726 rpm .the moment of inertia of rotating parts of the engine is 104 kg-m2 and that of the machine is 9.5 kg-m2 . Determine the weight of additional flywheel that will be required to keep the 7
Code No: R05320304
R05
Set No. 3
overall range of speed variation to 0.75% of mean speed. Radius of gyration of the flywheel is 0.45 m. [6+10]
in
7. Three cylinders of an air compressor have their axes at 1200 to one another and their connecting rods are coupled to a simple crank. The stroke is 12cms and the length of each connecting rod is 16cms.. Determine the primary and secondary forces. Mass of the reciprocating parts per cylinder = 1.5kg The engine Speed= 3000rpm. [16]
(a) The angles between the masses 1, 2 and 4.
ld .
8. A rotating shaft carries four masses 1, 2, 3 and 4 which are radially attached to it. The mass centres are 3 cm, 3.8 cm, 4 cm and 3.5 cm respectively from the axis of rotation. The masses 1, 3 and 4 are 7.5 kg, 8 kg and 5 kg respectively. The axial distances between 2 and 3 is 40 cm and between 1 and 3 is 15 cm. The masses 1 and 3 are at right angles to each other. Find for complete balance.
(c) The magnitude of mass 2.
or
(b) Axial distance between the planes of rotation of 3 and 4.
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?????
8
[16]
