STUPIDSID
1(a)
Define super critical boiler.
2 M
1(b)
What are different between forces circulation and natural circulation?
2 M
1(c)
What are the advantages of High pressure Boiler?
3 M
Solve any one question from Q.1(d) & Q.1(e)
1(d)
The following reading were obtained during a boiler trail of 5 hours duration.
Mean steam pressure =15 bar
Mean of steam generated =50,000kg
Mean dryness traction =0.85
Mean water temperature=30°C
Coal used=4000kg, Calorific value of coal=33400kJ/kg
Calculate:
i) Factor of equivalent evaporation
ii) Equivalent evaporation from and at 100°:C
iii) Efficiency of boiler
Mean steam pressure =15 bar
Mean of steam generated =50,000kg
Mean dryness traction =0.85
Mean water temperature=30°C
Coal used=4000kg, Calorific value of coal=33400kJ/kg
Calculate:
i) Factor of equivalent evaporation
ii) Equivalent evaporation from and at 100°:C
iii) Efficiency of boiler
7 M
1(e)
i) How much air used 1 kg of coal burnt in a boiler having Chimney height 50m to create a draught of 30.2 mm of water column when the temperature of the gases in the Chimney is 370°C and the temperature of boiler house is 25°C.
ii) What are advantages of artificial draught over natural draught.
ii) What are advantages of artificial draught over natural draught.
7 M
2(a)
What are limitations of Carnot cycle?
2 M
2(b)
How can we increase the efficiency of Rankine cycle?
2 M
2(c)
Derive an expression of thermal efficiency for regenerative cycle.
3 M
Solve any one question from Q.2(d) & Q.2(e)
2(d)
In a Rankine cycle, the steam at inlet to turbine in saturated at pressure of 30 bar and the exhaust pressure is 0.25 bar.
Determine:
i) Pump work
ii) Turbine work
iii) Rankine efficiency
iv) Condenser heat flow
v) Dryness at the end of expansion
vi) Work ratio
Assume mass flow rate = 10 kg/sec
Determine:
i) Pump work
ii) Turbine work
iii) Rankine efficiency
iv) Condenser heat flow
v) Dryness at the end of expansion
vi) Work ratio
Assume mass flow rate = 10 kg/sec
7 M
2(e)
i) Explain the binary vapour cycle with neat line diagram.
ii) Explain the modified Rankine cycle and show the modification by P-V and T-S curve.
ii) Explain the modified Rankine cycle and show the modification by P-V and T-S curve.
7 M
3(a)
How can we find the stagnation state? Write the equation for stagnation properly in insentropic flow.
2 M
3(b)
What is Mach number? How is it useful for calculation of gas-flow?
2 M
3(c)
Derive the equation
\[\dfrac{dA}{A}=\dfrac{dV}{V}(m^{2}-1)\]
Where A=area of cross section of duct
V=velocity of gas through duct
\[\dfrac{dA}{A}=\dfrac{dV}{V}(m^{2}-1)\]
Where A=area of cross section of duct
V=velocity of gas through duct
3 M
Solve any one question from Q.3(d) & Q.3(e)
3(d)
Define the critical pressure ratio, for the nozzle of steam turbine and derive the equation for maximum flow rate at throat in-terms of critical pressure ratio
7 M
3(e)
i) Explain meta stable flow of steam in nozzle
ii) Derive the expression for nozzle efficiency.
ii) Derive the expression for nozzle efficiency.
7 M
4(a)
What are effect of clearance on the performance of reciprocating compressors.
2 M
4(b)
Why is multistage essential for high compression ratio?
2 M
4(c)
Classify the rotary compressor and write comparison of rotary and reciprocating compressor.
3 M
Solve any one question from Q.4(d) & Q.4(e)
4(d)
An air compressor takes in air at 1 bar and 27°C and delivers it after compression at 5 bar. Find the :
- Work done
- Heat transfer
- Change in internal energy when compression process are
- Isothermal
- Reversible adiabatic
7 M
4(e)
Derive the equation for minimum work done in-terms of intermediate pressure of multistage compressor.
7 M
5(a)
Explain the term vacuum and how it is measured?
2 M
5(b)
How air leakage effects the performance of condenser?
2 M
5(c)
What is fouling factor? What is difference between counter flow and parallel flow condenser.
3 M
Solve any one question from Q.5(d) & Q.5(e)
5(d)
A steam condenser in equipped in a steam power plant which handles 1500kg/hr of steam and develops 2.5MW power. The initial condition of steam 27 bar, 300°C, the exhaust after condenser maintained at 72cm of Hg. Temperature at circulating water increases from 20°C to 28°C. While condensate removed at a temperature of 27°C, workout followings:
i) 7.5 diagram
ii) Dryness fraction of steam entering the condenser
iii) Mass rate of circulating water and cooling ratio
iv) Degree of under cooling.
i) 7.5 diagram
ii) Dryness fraction of steam entering the condenser
iii) Mass rate of circulating water and cooling ratio
iv) Degree of under cooling.
7 M
5(e)
Explain various types of cooling tower and its design construction.
7 M
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