GTU previous question papers -BE- Sem-Vth -Power Plant Engineering -Nov/Dec-2011

GTU previous question papers

GUJARAT TECHNOLOGICAL UNIVERSITY

BE SEM-V Examination-Nov/Dec.-2011

Subject code: 1519                      

Subject Name: Power Plant Engineering 

 

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1 (a) Draw a steam power plant and discuss its advantages.                         

(b) (i) What is the function of stokers? Compare underfeed and

overfeed stokers.

(ii) Enumerate different types of ash handling systems.

Discuss the working of pneumatic ash handling system.                                              

Q.2 (a) Explain the working of pressurized fluidized bed combustion boiler with help of neat sketch.                        

(b) (i) Distinguish between superheater, reheater and air

preheater.

(ii) What is subcritical and supercritical boiler?

(iii) Write different methods of controlling temperature of super heated steam.

OR

(b) What are the reasons of corrosion in a boiler and how it is control?                       

Q.3 (a) (i) What is pH value of water? What is its important in

boiler feed water?

(ii) Explain sea water treatment plant.                                               

(b) Draw and explain diesel engine power plant.                         

OR

Q.3 (a) (i) What are the different impurities in feed water and

write their effect on boiler.

(ii) With help of neat sketch explain Zeolite feed water

treatment process.                                              

(b) Differentiate Between :

(i) Wet sump lubricating system and Dry sump

lubricating system.

(ii) Diesel power plant and steam power plant.

(iii) Water cooling system and air cooling system.                       

Q.4 (a) Explain the followings :

(i) Binding energy

(ii) Mass defect

(iii)Moderators

(iv) Control rod

(v) Isotopes

(vi) Nuclear fission

(vii) Nuclear fusion                       

(b) What are the different pollutant emitted from power plant and discuss its defects.                       

OR

Q.4 (a) With help of neat sketch explain advantages and

disadvantages of boiling water reactor nuclear powerplant.                       

(b) Define the following :

(i) Connected load

(ii) Maximum demand

(iii)Average demand

(iv) Load factor

(v) Diversity factor

(vi) utilization factor

(vii) Plant capacity factor                       

Q.5 (a) A 100 MW thermal power has peak load of 65 MW. The

power station supplies load to four town having their

maximum demand of 20 MW, 15 MW, 10 MW and

30MW. The annual load factor is 65%. Find :

(i) Average load on the plant.

(ii) Energy supplied per year.

(iii) Diversity factor.

(iv) Demand factor.

(v) Plant capacity factor.                       

(b) (i) Why cooling towers used in a thermal power plant?

Discuss the working of a natural cooling tower.

(ii) Why is draught necessary in a boiler? Compare the

natural draught and artificial draught.                                              

OR

Q.5 (a) (i) Determine height of the chimney to produce a static

draught of 17 mm of water. The temperature in the

chimney is 300oC and surrounding temperature is 28oC.

The barometer reads 755 mm of Hg. The value of of

characteristic gas constant is 287 J/kgK and that for

gases is 255 J/kgK

(ii) Write disadvantages of steam, diesel and nuclear power

plant.                                              

(b) A steam turbine of 20,000 kW capacity requires 5 kg of

steam per hour per kW. The quantity of air leakage into the

condenser is 1 kg per 1000 kg of steam used by turbine.

The vacuum in the condenser is 70 cm of Hg when the

barometer reads 76 cm of Hg. The temperature at the

suction of the air pump is 30oC. The surface condenser

used is fitted with a separate condensate pump and air

pump. Find :

a) The capacity of the air pump requires per minute.

b) The mass of water vapor carried by air in kg/hr.

c) The quantity of cooling water required per minute in

tons if the rise in temperature of water is limited to 8oC.

The quantity of steam entering the condenser is 0.9 dry

and there is no under cooling in the condenser.

Properties of steam at 30oC :

Absolute Pressure                        = 0. 325 bar

Enthalpy of liquid hf                   = 125.8 kJ/kg

Enthalpy of evaporation hfg    = 2438.1 kJ/kg

Specific volume                             = 32.8 m3/kg

 

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