STUPIDSID
1 (a)
Explain the difference between malleability and ductility
2 M
1 (b)
Explain the stress-strain diagram for mild steel.
2 M
1 (c)
Give the classification of carbon steel.
3 M
Answer any one question form Q1.(d) & Q1.(e)
1 (d)
Explain the Steel and Iron Carbon diagram.
7 M
1 (e)
A rod 150 cm long and diameter 2 cm is subjected to an axial pull of 20 kN. If the modulus of elasticity of the material of the rod is 2 × 105 N/mm2 determine stress, strain, and the elongation of the rod.
7 M
2 (a)
Briefly explain the devices used for measuring the pressure of a fluid.
2 M
2 (b)
Explain the principle of temperature measurement.
2 M
2 (c)
Describe vernier caliper with neat sketch.
3 M
Answer any one question from Q2.(d) & Q2.(e)
2 (d)
Explain the construction and working principle of a simple lathe machine.
7 M
2 (e)
Explain the principle of venturimeter with a neat sketch and derive the expression for the rate of flow of fluid through it.
7 M
3 (a)
What do you mean by vacuum pressure.
2 M
3 (b)
State the Newton's law of viscosity and give examples of its application.
2 M
3 (c)
What factors decide whether Kaplan, Francis or a Pelton type turbine would be used in a hydroelectric project?
3 M
Answer any one question from Q3.(a) & Q3.(e)
3 (d)
State Bernoulli's theorem and derive equation for the flow of an incompressible fluid. Mention the assumptions made for deriving it.
7 M
3 (e)
Calculate specific weight, density, specific volume and specific gravity of petrol, if one liter of petrol weighs 6.867 N.
7 M
4 (a)
State and explain second law of thermodynamics.
2 M
4 (b)
Show the various process of steam in a T-S diagram.
2 M
4 (c)
How boilers are classified? Write down few names of mountings and accessories of a boiler.
3 M
Answer any one question from Q4.(d) & 4.(e)
4 (d)
Calculate the internal energy of 1 kg of steam at a pressure of 10 bar, when the steam is
(i) 0.9 dry (ii) dry saturated (iii) super heated to 250 °C
(i) 0.9 dry (ii) dry saturated (iii) super heated to 250 °C
7 M
4 (e)
The following observations were made in a boiler
Calculate the equivalent evaporation from and at 100 °C per kg of coal and boiler efficiency.
| Coal used = 200 kg/hr | Mass of steam = 2000 kg/hr |
| Steam pressure = 11.2 bar | Dryness fraction = 0.95 |
| Feed water temperature = 32.15 °C | Calorific value of coal = 28800 kj/kg |
Calculate the equivalent evaporation from and at 100 °C per kg of coal and boiler efficiency.
7 M
5 (a)
What is Carnot cycle and its importance?
2 M
5 (b)
Write any four advantage of 4 stroke petrol engine over 2 stroke petrol engine.
2 M
5 (c)
For the same compression ratio and heat supplied, state the order of decreasing air standard efficiency of Otto, diesel and dual cycle.
3 M
Answer any one question from Q5.(d) & Q5.(e)
5 (d)
Find the power output of a diesel engine working on a diesel cycle with compression ratio of 16 and air flow rate of 0.25 kg/sec. the initial condition of air at 1 bar absolute and 27 °C temperature, heat added per cycle 2500 kJ/kg.
7 M
5 (e)
The minimum pressure and temperature in a Otto cycle are 100 kPa and 27 °C. The amount of heat added to the air per cycle is 1500 kJ/kg. Determine the pressures and temperatures at all points of the air standard Otto cycle. Also calculate the specific work and thermal efficiency of the cycle for compression ratio of 8 : 1.
7 M
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