III B.Tech II Semester Supplementary Examinations, April/May 2005 PRINCIPLES OF MACHINE DESIGN (Mechatronics) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. A line shaft rotating at 200 rpm is to transmit 20 kW. The allowable shear stress for the material of the shaft is 42 MPa. If the shaft carries a central load of 900 N and is simply supported between bearing 3 meter apart, determine the diameter of the shaft. The maximum tensile or compressive stress is not to exceed 56 MPa. 2. (a) Discuss the effect of keyways on shafts . (b) A 15kW , 960 rpm motor has a mild steel shaft of 40mm diameter and the extension being 75mm. The permissible shear and crushing stresses for the mild steel key are 56 N/mm2 and 112N/mm2 . Design the keyway in the motor shaft extension. Check the shear strength of the key against the normal strength of the shaft. 3. (a) What are the rolling contact bearings? Discuss their advantages over sliding contact bearings. (b) Write short note on different types of antifriction bearings. 4. Design a compression coupling for a shaft to transmit 1300 N-m. The allowable shear stress for the shaft and key is 40 MPa and the number of bolts connecting the two halves are 4. The permissible tensile stress for the bolts material is 70 MPa. The coefficient of friction between the muff and the shaft surface may be taken as 0.3. 5. A steel rod is subjected to a reversed axial load of 180 kN. Find the diameter of the rod for a factor of safety of 2. Neglect column action. The material has an ultimate tensile strength of 1070 MPa and yield strength of 910 MPa. The endurance limit in reversed bending may be assumed to be one-half of the ultimate tensile strength. Other correction factors may be taken as follows: For axial loading = 0.7; For machined surface = 0.8; For size = 0.85; For stress concentration = 1.0. 6. Design and draw a trunk type of piston for a single cylinder four-stroke diesel engine running at 1000 rpm. Other data available are: Maximum explosion pressure = 3.5 MN/m2 Mean effective pressure = 0.65 MN/m2 Diameter of piston = 150 mm Stroke length = 200 mm Connecting rod length = 450 mm bsfc = 0.27 kg/kWh
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NR
Code No: NR321401
7. Power of 60 kW at 730 rpm. from an electric motor is to be transmitted to a compressor shaft at 300 rpm. by V-belt. Approximate larger pulley diameter is 1500 mm. Approximate center distance is 1650 mm. Overload factor is 1.5. Design the V-belts. 8. Design and draw a spur gear drive transmitting 30 kW at 400 rpm to another shaft running approximately at 100 rpm. The load is steady and continuous. The materials for the pinion and gear are cast steel and cast iron respectively. Take module as 10 mm. Also check the design for dynamic load and wear. ?????
Code No: NR321401 III B.Tech II Semester Supplementary ...
The maximum tensile or compressive stress is not to exceed 56 MPa. 2. (a) Discuss the effect of keyways on shafts . (b) A 15kW , 960 rpm motor has a mild steel ...
250 kN and a minimum value of 100 kN. The properties of the plate material are as follows: · Endurance limit stress = 225 MPa, and yield point stress = 300 MPa.
1.a) Explain with a neat sectional view the operation and advantages of hot blast · cupola. b) Discuss the various types of refractories used for cupola lining.
W/mk] followed by a 25mm layer of fiber-glass insulation [k=0.048 W/mk]. ... boundary layer thickness in the heat transfer over a flat plate tested over its entire ...
5.a) What is sine bar. Sketch an arrangement for any one of the applications. b) Describe the constructional features and working of optical collimator.
b) With the help of a neat sketch of psychometric chart show the various psychrometric · processes naming them clearly. c) Explain what effective temperature is ...
Code No: NR320802. NR ... 1. (a) Define reaction rate constant. Develop an expression that facilitates calcula- · tion of units of rate constant for any order.
c) Determine the symmetrical components of currents in the following circuit · (contdâ¦3) · AjntuWorld. ... a) Synchronous phase modifiery · b) Insulating materials.
Write a short note on 'compressor surge and its prevention'. 6.a) In rocket propulsion, explain the following: · (i) Thrust coefficient (ii) Characteristic velocity (iii) Specific impulse. b) Derive the 'Generalised Thrust Equation, of a rocket from
Code No: 320452. III-B.Tech II-Semester Supplementary Examination December2002/January 2003 · LINEAR DIGITAL I.C.APPLICATIONS · (Common to Electronics and Communication Engineering, · Electronics and Control Engineering, Electronics Instrumentation ·
with 64 addressing modes. The computer has 500 instructions. In one of the · instruction format the First Field represents operator field, Second Field is Mode,.
POWER SYSTEMS-III · (Electrical & Electronic Engineering) · Time: 3 hours ... 1. Discuss the behaviour of traveling wave when it reaches the end of ... (b) Explain the selection of surge arresters with reference to switching surges . [ 8+8].
1. a) With a schematic diagram explain the operation of a hot blast cupola. What is its · application? b) How are the refractories classified? Explain the factors in ...
Describe the manufacturing process of paper with a neat flow diagram. 4. a) Distinguish between Oils and ... Toilet Soaps · (c) · Vinyl Chloride (e) · Nylon - 6,6 (f).
4.a) What are the advantages of barometric condenser over surface condenser in steam · jet refrigeration system. b) Explain the phenomenon of energy transfer ...
5.a) Explain the principle of working of a precision rotary phase shifter, with neat ... and (ii) a simple ideal dielectric phase shifter in a rectangular guide.
ARTIFICIAL INTELLIGENCE · (Computer Science ... Every dog has bitten a mail carrier (ii) Every dog has bitten every mail · carrier. b) Explain the six ...
Draw and explain the three layer networks that emulates the 'XOR' function. ... Hopfield network could be used to perform error correction, although in fact, it is.
320256. III-B.Tech. II Semester Supplementary Examinations December 2002/January 2003 · MODELLING OF POWER SYSTEM COMPONENTS · (Electrical and Electronics Engineering) · Time: 3 hours · Max. Marks: 70 · Answer any FIVE questions · All questions carry
Explain the following top-down parsing methods with example. a) Recursive-Descent parsing · b) Predictive parser · 5.a) Explain about the specification of a ...
1011. 7.a) Discuss the generation and detection of pulse width modulation. b) Explain the principle transversal equiliber. 8. Write short notes on the following:.
b) Draw a graph showing the refractive index distribution of central core cladded · optical fibre and explain the plot. 2.a) Give any three applications of optical ...
mutual exclusion may be violated. b) Discuss the timestamp-based protocol for concurrent atomic transactions. 7.a) Differentiate protection and security.
