JNTU
JNTU B.Tech II MECHANICAL TECHNOLOGY Previous Question Paper (November/December - 2017 - R13)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
Part A
List some applications of CAMS.
Answer
Cams are primarily used in automatic machinery, internal combustion engine valve operating mechanisms, printing presses, textile machinery, and feed mechanisms for machine tools.
Classify followers based on surfaces in contact.
Answer
Followers are classified based on the surface in contact as follows:
- Knife-edge follower
- Roller follower
- Flat-faced follower
- Spherical-faced follower
What are the different types of Belt used?
Answer
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Differentiate the belt, rope and chain drives.
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Calculate the minimum number of teeth on the pinion to operate without interference in standard full height in volute teeth gear mechanism with 20° pressure angle.
Answer
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If the pressure angle of the rack is 20°, then force acting along the line of action between the rack and the gear teeth is?
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What are the applications of IC engine?
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What is 4-stroke engine?
Answer
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State how the compressors are classified.
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State the advantage of clearance volume in a cylinder.
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Part B
With the help of neat sketches, explain the types of cam and follower.
Answer
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Draw the cam profile for cam with roller reciprocating follower. The axis of the follower passes through the axis of cam roller diameter = 5 mm, minimum radius of cam = 20 mm, total lift = 25 mm. The cam has to lift the follower with SHM during 180° of cam rotation, then allow the follower to drop suddenly half way, and further return the follower with uniform velocity during the remaining 180° of cam rotation. Determine the maximum velocity and acceleration on the outstroke if cam rotates at a uniform speed of 100 rpm.
Answer
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Derive an expression for ratio of driving tension on tight side and slack side.
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Derive an expression for length of cross belt drive.
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Write down the difference between the graphical and analytical method of cam and follower motion plotting.
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Explain the analytical solution for calculation of displacement, velocity, acceleration and jerk of follower having cycloidal motion.
Answer
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With a neat sketch explain the working principle of simple carburetor.
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The volume ratio of compression and expansion for a Diesel engine as measured from an indicator diagram are 15.3 and 7.5 respectively. The pressure, temperature and volume at the begging of the compressor are 1 bar, 27°C and 1 m³ respectively. Assuming an ideal engine, determine the mean effective pressure, the ratio of maximum pressure to mean effective pressure and cycle efficiency. Also find the fuel consumption per kWh if the indicated thermal efficiency is 0.5 of ideal efficiency, mechanical efficiency is 0.8 and the calorific value of oil is 42000 kJ/kg. For air Cp = 1.005 kJ/kg-K, Cv = 0.718 kJ/kg-K and γ = 1.4.
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A two stage air compressor takes in air at a rate of Intake pressure is 1 bar and 16. Final pressure is 7 bar the intermediate pressure is ideal with perfect inter cooling. The compression takes place according to law The compressor runs at 600 rpm. Neglecting clearance determine a) The intermediate pressure b) Volume of each cylinder c) cylinder power.
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Derive an expression for the intermediate pressure which gives minimum power in a two stage compressor with perfect inter cooling.
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