Anna University Previous Years Question Papers
Question paper code: 71860
B.E,B.TECH DEGREE EXAMINATION,APRIL/MAY-2015
Sixth semester
Mechanical Engineering
ME 2352/ME 61/ ME 1352/ 10122 ME 603-DESIGN OF TRANSMISSION SYSTEM
(Common to Mechanical and automobile Engineering)
(Regulation 2008/2010)
(Common to PTEM 2352-Design of transmission system for B.E. (part-time) Fifth and sixth semester Mechanical Engineering (Regulation 2008/2010))
Use of Approved Design data books permitted
Time- Three hour
Maximum mark-100
Answer all questions
PART A-10X2=20marks
1. In what way the timing belts are superior to ordinary
2. What is meant by “Chordal action of chain”? Also name a company that produces driving chain?
3. State the law of gearing.
4. What is pressure angel? What is the effect of increase in pressure angel?
5. State the advantages of harring bone gear.
6. What is a Zerol bevel gears?
7. Draw the ray diagram for a six speed gear box.
8. In which gear-derive, self-locking is available?
9. If a multi disc clutch has a 6 discs in driving shaft and 7 discs in driving shaft, then how many number of contact surfaces it will have?
10. Why in automobiles, braking action when travelling in reserve is not as effectives as when moving forward?
Part- B 5x16=80 marks
11.(a) Design a V-belt drive and calculate the actual belt tensions and average stress for the following data. Power to be transmitted=7.5kw, Speed of deriving wheel = 1000rpm, Speed of deriving wheel = 300rpm, diameter of driven pulley=500mm, diameter of driven pulley=150mm and center distance=925mm.
(or)
(b)A 7.5kw electric motor running at 1400rpm is used to derive the input shaft of the gearbox of a machine. Design a suitable roller chain to connect the motor shaft to the gear box to given an exact speed radio 0f 10:1. The center to center distances of the shaft to be approximately 600mm.
12.(a) Design a super gear drive to transmit 8kw at 720rpm and the radio is 2. The pinion and wheel are made of the surface hardened carbon steel with 55 RC and core hardness less than 350 BHN. Ultimate strength is 720N/mm2 and yield strength is 360N/mm2.
(or)
(b)Design helical gear drive to transmit the power of 14.7kw. Speed radio 6, pinion speed 1200rpm, helix angel is 250.Select suitable materials and design the gear.
13.(a) Design a pair of straight bevel gears for two shafts whose axis are at right angels. The power transmitted is 25kw. The speed of pinion is 300rpm and of a gear is 120rpm.
(or)
(b)Design a worm gear drive to transmit 22.5kw at a worm speed of 1440rpm. Velocity radio is 24:1. An efficiency of at least 85% is desired. The temperature raise should be restricted to 400 C. Determine the required cooling area.
14.(a) Design a nine speed gear box for a machine to provide speed ranging from 100rpm to 1500rpm. The input is from a motor of 5kw at 1440rpm. Assume any alloy steel for the gears.
(or)
(b) Design a 12 speed gear box for a lathe. The minimum and maximum speed are 100 to 1200rpm.Power is 5kw from 1440rpm induction motor.
15.(a) A power of 20kw is to be transmitted through a cone clutch at 500rpm. For uniform wear condition, find the main dimension of clutch and shaft. Also determine the axial force required to engage the clutch. Assume coefficient of friction as 0.25, the maximum normal pressure on the friction surface is not to exceed 0.08MPa and take the design stress for the shaft materials as 40MPa.
(or)
(b) Design a differentiate band brake for a winch lifting a load 20kn through a steel wire rope wound around a barrel of 600mm diameter. The break drams, keyed to the barrel shaft, 800mm diameter and the angel of the lap of the bond over the drams is about 2400. Operating arms of the break are 50mm and 250mm. The length of operating lever is 1.6m.
Question paper code: 71860
B.E,B.TECH DEGREE EXAMINATION,APRIL/MAY-2015
Sixth semester
Mechanical Engineering
ME 2352/ME 61/ ME 1352/ 10122 ME 603-DESIGN OF TRANSMISSION SYSTEM
(Common to Mechanical and automobile Engineering)
(Regulation 2008/2010)
(Common to PTEM 2352-Design of transmission system for B.E. (part-time) Fifth and sixth semester Mechanical Engineering (Regulation 2008/2010))
Use of Approved Design data books permitted
Time- Three hour
Maximum mark-100
Answer all questions
PART A-10X2=20marks
1. In what way the timing belts are superior to ordinary
2. What is meant by “Chordal action of chain”? Also name a company that produces driving chain?
3. State the law of gearing.
4. What is pressure angel? What is the effect of increase in pressure angel?
5. State the advantages of harring bone gear.
6. What is a Zerol bevel gears?
7. Draw the ray diagram for a six speed gear box.
8. In which gear-derive, self-locking is available?
9. If a multi disc clutch has a 6 discs in driving shaft and 7 discs in driving shaft, then how many number of contact surfaces it will have?
10. Why in automobiles, braking action when travelling in reserve is not as effectives as when moving forward?
Part- B 5x16=80 marks
11.(a) Design a V-belt drive and calculate the actual belt tensions and average stress for the following data. Power to be transmitted=7.5kw, Speed of deriving wheel = 1000rpm, Speed of deriving wheel = 300rpm, diameter of driven pulley=500mm, diameter of driven pulley=150mm and center distance=925mm.
(or)
(b)A 7.5kw electric motor running at 1400rpm is used to derive the input shaft of the gearbox of a machine. Design a suitable roller chain to connect the motor shaft to the gear box to given an exact speed radio 0f 10:1. The center to center distances of the shaft to be approximately 600mm.
12.(a) Design a super gear drive to transmit 8kw at 720rpm and the radio is 2. The pinion and wheel are made of the surface hardened carbon steel with 55 RC and core hardness less than 350 BHN. Ultimate strength is 720N/mm2 and yield strength is 360N/mm2.
(or)
(b)Design helical gear drive to transmit the power of 14.7kw. Speed radio 6, pinion speed 1200rpm, helix angel is 250.Select suitable materials and design the gear.
13.(a) Design a pair of straight bevel gears for two shafts whose axis are at right angels. The power transmitted is 25kw. The speed of pinion is 300rpm and of a gear is 120rpm.
(or)
(b)Design a worm gear drive to transmit 22.5kw at a worm speed of 1440rpm. Velocity radio is 24:1. An efficiency of at least 85% is desired. The temperature raise should be restricted to 400 C. Determine the required cooling area.
14.(a) Design a nine speed gear box for a machine to provide speed ranging from 100rpm to 1500rpm. The input is from a motor of 5kw at 1440rpm. Assume any alloy steel for the gears.
(or)
(b) Design a 12 speed gear box for a lathe. The minimum and maximum speed are 100 to 1200rpm.Power is 5kw from 1440rpm induction motor.
15.(a) A power of 20kw is to be transmitted through a cone clutch at 500rpm. For uniform wear condition, find the main dimension of clutch and shaft. Also determine the axial force required to engage the clutch. Assume coefficient of friction as 0.25, the maximum normal pressure on the friction surface is not to exceed 0.08MPa and take the design stress for the shaft materials as 40MPa.
(or)
(b) Design a differentiate band brake for a winch lifting a load 20kn through a steel wire rope wound around a barrel of 600mm diameter. The break drams, keyed to the barrel shaft, 800mm diameter and the angel of the lap of the bond over the drams is about 2400. Operating arms of the break are 50mm and 250mm. The length of operating lever is 1.6m.
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