Roll No. :... Invigilator's Signature :. CS/B.Tech(EE-OLD)/SEM-4/ME(EE)-411/ THERMAL POWER ENGINEERING

Size: px

Start display at page:

Download "Roll No. :... Invigilator's Signature :. CS/B.Tech(EE-OLD)/SEM-4/ME(EE)-411/ THERMAL POWER ENGINEERING"

Bertram Newman
5 years ago
Views:

1 Name : Roll No. :... Ivigilator's Sigature :. 01 THERMAL POWER ENGINEERING Time Allotted : 3 Hours Full Marks : 70 The figures i the margi idicate full marks. Cadidates are required to give their aswers i their ow words as far as practicable GROUP A ( Multiple Choice Type Questios ) 1. Choose the correct alteratives for ay te of the followig : 10 1 = 10 i) Bomb calorimeter is used to determie the calorific value of a) solid fuels oly b) liquid fuels oly c) solid as well as liquid fuels d) gaseous fuel (O) [ Tur over

2 ii) For a steam ozzle with ilet & outlet pressure ad, the mass flow rate per uit area is maximum if a) iii) iv) b) c) d) The pressure o the two sides of the impulse wheel of steam turbie a) is same b) is differet c) decreases from oe side to the other d) icreases from oe side to the other. For maximum blade efficiecy of Parso's reactio steam turbie a) = cos b) V i V i = cos c) = cos V d) i V i = cos (O)

3 v) Draught produced by chimey is described as a) iduced draught b) atural draught c) forced draught d) balace draught. vi) vii) Basic closed cycle for gas turbie is a) Caot cycle b) Rakie cycle c) Brayto cycle d) St rlig cycle. The maximum volumetric efficiecy ca be icreased for four stroke I.C. egies by a) icreasig cy ider dia b) icreasig the ilet valve diameter c) icreasig pisto speeds d) decreasig pisto speeds. viii) Compressio ratio of S.I. egies ormally varies from a) 4 to 6 b) 6 to 1 c) 10 to 18 d) 14 to (O) 3 [ Tur over

4 ix) For the same compressio ratio a) Otto cycle is more efficiet tha diesel cycle b) efficiecy of both are same c) diesel cycle is more efficiet tha Otto cycle d) oe of these. x) Igitio quality of diesel egie fuel is expressed by a idex called a) octae umber b) cetae umber c) C.V. d) auto-igitio temperature. xi) Igitio qua ity of petrol egie fuel is expressed by a i dex called a) cetae umber b) octae umber c) auto-igitio temperature d) C.V (O) 4

5 GROUP B ( Short Aswer Type Questios ) Aswer ay three of the followig. 3 5 = 15. a) How are fuels classified? b) How ca you distiguish secodary fuels from the primary oes? c) How does the volatile matter cotet determie the rak of coal? d) How does sulphur occur i coal? e) What is the effect of volatile matter i the combustio process? a) Draw eat diagrams to represet schematically : i) Natural circulatio ii) iii) iv) Forced mult ple c rculatio Ope hydraulic system Combied circulatio. b) What is the combustio efficiecy of PFBC boilers? What are the pollutats i the automotive egie exhaust? How are they cotrolled? 5. Describe briefly the workig priciple of a ESP with a eat sketch. 6. Derive a expressio of power required at the blade to ru a steam turbie (O) 5 [ Tur over

6 GROUP C ( Log Aswer Type Questios ) Aswer ay three of the followig = a) Show with usual otatios that the thermodyamic efficiecy of a costat pressure closed gas turbie is 1 give by th = 1 1. R b) A ope cycle gas turbie works betwee the pressure rage of 1 bar & 6 bar & temperature rage of 300 K & 103 K. The C v of the fuel used is kj/kg. Fid the followig : i) A : F ratio ii) iii) Thermal efficiecy of the plat kw geeratig capacity of the plat if the flow of air is 10 kg/sec a) What is a valve timig diagram? Explai the terms 'preigitio' ad 'delay period'. b) Calculate the relative efficiecy o IP basis ad a : f r tio used for a 4-stroke gas egie developig 3 5 kw of BP at 160 rpm & at full load, assumig v = 87%, mech = 73 5% V c = 100 cu.cm V s = 9000 cu.cm Fuel cosumptio 5 cu.m/hr, C v of fuel = kj/hr ad all workig cycles are effective (O) 6

7 9. a) Write the steps of Morse test to fid the IP of a I.C. egie. b) Give schematically the workig priciple of Zeith carburettor. c) Explai the term 'kock ratig' of fuel a) Show that for maximum discharge of steam through ozzle takes place whe the ratio of steam pressure at throat to the ilet pressure is give by = 1 b) What are the limitatios of chimey draught? c) Give a schematic arragemet for the gas aalysis a) Defie compoudig as used i turbie. Explai clearly velocity compoudig & pressure compoudig with sketch. b) A steam power plat has the rage of operatio from 40 bar dry saturated to 0 5 bar. Determie the cycle efficiecy of the turbie (O) 7 [ Tur over

FUEL-BURNING EQUIPMENT - OXIDES OF NITROGEN (Effective 7/1/71: Rev. Effective 9/20/94)

RULE 68. FUEL-BURNING EQUIPMENT - OXIDES OF NITROGEN (Effective 7/1/71: Rev. Effective 9/20/94) (a) APPLICABILITY Except as provided i Sectio (b), this rule is applicable to ay o-vehicular, fuelburig equipmet