RGPV First Year Engineering (Set A) (Semester 2)
Basic Mechanical Engg.
December 2015
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1(a) State the material used for making of the following parts, stating reason Twist drill, milling cutter.
2 M
1(b) Compare properties of ferrous and non- ferrous metals.
2 M
1(c) Define the following properties of material.
Ductility, Toughness, Hardness, Creep.
3 M
Solve any one question from Q.1(d) &Q.1(e)
1(d) Sketch the iron-carbon equilibrium diagram and point out its salient features.
7 M
1(e) What is the purpose of testing engineering materials? Explain the following reactions in relation to iron carbon equilibrium diagram.
7 M

2(a) Distinguish between
i) Range and span
ii) Error and accuracy
iii) Accuracy and precision
2 M
2(b) Explain how sine bar used for setting an angle and for finding an unknown angle.
2 M
2(c) Describe the construction and use of dial gauge.
3 M
Solve any one question from Q.2(d) &Q.2(e)
2(d) Explain the principal of operation of rotameter for discharge measurement.
7 M
2(e) Describe with a neat sketch, the working of a bimetallic thermometer.
7 M

3(a) Distinguish between inward and outward flow reaction turbine.
2 M
3(b) Distinguish between positive displacement and non-positive displacement compressor.
2 M
3(c) Sketch the general arrangement of a hydropower plant and state the function of its different components.
3 M
Solve any one question from Q.3(d) &Q.3(e)
3(d) Water is flowing though an inclined conical pipe, 100m long. It has 600mm diameter at the upper end and 300mm at the lower end the discharge rate is 50 lit/sec. The pipe has a slope of 1/2:15. Find the pressure at the lower end if the pressure at the upper end is 2.5 bar.
7 M
3(e) Water flows through 200mm diameter pipe. The point A and B are at elevation of 6m and 8m, respectively along the inclined pipe. The pressure at A and B are 50 kPa and 20 kPa, respectively if the flow rate is 60 lit/s determine
i) Direction of low.
ii) Head loss between these points.
7 M

4(a) What are the properties of good refrigerant?
2 M
4(b) Prove that (COP)R+1=(COP)H.P
2 M
4(c) ''Equivalent evaporation from and at 100°C''. Explain the meaning of the term and give the reason for its use in the context of boiler performance.
3 M
Solve any one question from Q.4(d) &Q.4(e)
4(d) Obtain an expression for draught produced in mm of water column when the discharge is maximum.
7 M
4(e) The pressure volume correlation for a non-flow reversible (quasi-static) process is given by p=(8-4V) bar, where V is in m3. If 150 KJ of work is supplied to the system determine the final pressure and volume of the system. Take initial volume 0.6m3.
7 M

5(a) What is cutoff ratio? How does it affect the air standard efficiency of an Otto cycle?
2 M
5(b) How is the mean effective pressure for reciprocating engine defined?
2 M
5(c) Compare diesel engine with petrol engine with reference to maximum pressure, efficiency power to weight ratio, cost and load control. Give explanation.
3 M
Solve any one question from Q.5(d) &Q.5(e)
5(d) A gas engine working on Otto cycle operates with the following parameter's inlet condition 1 bar pressure 320 k temperature compression ratio 4:1 and pressure ratio 4:1. If the working fluid is air with R=287 J/Kg k and Y=1.4. Make calculation for useful workdone, thermal efficiency and mean effective pressure.
7 M
5(e) With the help of P-V and T-S diagrams. Show that for the same maximum pressure and heat input.
ηdieseldualotto
7 M



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