Tuttorials

INSTRUCTIONS:  1 Use of unfair means and copying from the books or from fellow students is strictly prohibited.

                          2. Write answers/give reply in your own words to reflect your original contribution.

                          3. Get clarified/ addressed your doubts, queries or problems to help your self study process.

                          4. Feel free to interact/ express your views or opinion/ share your knowledge to help  others                                    learn from you only.

TUTORIAL/CASE NO.-1       SCHEDULED date ____________________­­­­­­­

Q.No.1         An open belt connects two flat pulleys. The smaller pulley is 600 mm in diameter and turns 200 revolutions per minute. The angle of lap on the pulley is 160⁰ and pulley face is 0.25. If maximum permissible tension in belt is 2500 N, calculate the power transmitted by belt.

Q.No.-2           During a tensile test on a mild steel specimen, 40 mm diameter and 200 mm long. The following data were obtained:

Extension at 40 KN load =0.0304 mm, Yield load =161 KN and length of specimen at fracture=249 mm.

                                    Determine

                                    a)    modulus of elasticity     b) percentage elongation and

                                    c)     Yield point stress.

TUTORIAL/CASE NO.-2                SCHEDULED date ____________________­­­­­­­

Q.No.-1          (a) Draw a neat diagram showing the main elements of a NC machine, and state the function served by each element.

                                    (b) Write the advantages and applications of NC machines.

Q.No.-2       (a) Explain the difference between open and closed loop system control system in relation to NC and CNC machine system. 

(b) How a CNC machine differs from a NC machine? Name the main components of a CNC

                                    system. 

TUTORIAL/CASE NO.-3        SCHEDULED date ____________________­­­­­­­

Q.No.-1           It is desired to compress 10 kg of gas from 1.5 m³ to 0.3 m³ at constant pressure of 15-bar. During this compression process, the temperature rises from 20⁰ C to 150⁰ C and increase in internal energy is 3250KJ. Calculate the work done, heat interaction and change in enthalpy during the process. Also work out the average value of specific heat at constant pressure.

Q.No.-2           Distinguish between a heat engine, a heat pump and a refrigerator.  

TUTORIAL/CASE NO.-4       SCHEDULED date ____________________­­­­­­­

Q.No.-1           (a) Describe, with a neat schematic arrangement, the working of a simple vapour compression refrigeration cycle. Represent the cycle on p-v and T-S plots.

(b) Draw a neat sketch of a centrifugal pump and explain how does it operates?

Q.No.-2        Draw a well labelled neat sketch of a lathe machine and state the functions of its different parts.