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Posted Date: 04 Sep 2008 Posted By:: Megha Member Level: Silver Points: 5 (₹ 1)
2007 Janardan Rai Nagar Rajasthan Vidyapeeth B.Tech Electrical Engineering B-Tech Electrical University Question paper
BIT - III TOTAL PAGES:02
BACHELOR IN TECHNOLOGY
(SEMESTER – III) (AERONAUTICAL/CHEMICAL/ELECTRICAL/MARINE/MECHANICAL/MINING/METALLURGY)
TIME: 03 HOURS MAX. MARKS: 75
1. Question paper is divided into three groups
2. Each group is of 25 marks each
3. Figure to the right in bracket indicates mark
4. Assume suitable data if necessary
GROUP A: Answer any three questions. Question No. 1 is compulsory.
Q.1 Explain the method of determining the indicated power of a multi-cylinder engine without using an indicator. (05)
Q.2 Air at 1 bar and 300C is to be compressed to 1.2 bar at the rate of 50m3/min. Find the power required by a Roof s blower. (10)
Q.3 Explain the working of Modern Carburetor ? (10)
Q.4 Air at 1 bar and 30o C is to be compressed to 1.2 bar at the rate of 50 m3/min. Find the power required by a Roofs blower (10)
Q.5 The following data refer to a test on a petrol engine: Indicated power = 30kW; Brake power = 26; Engine speed = 1800 rpm; Fuel per brake power hour =0.35 kg;Calorific value of the fuel used = 44 100 kJ/Kg(10)
GROUP B: Answer any three questions. Question No. 6 is compulsory.
Q.6 Differentiate between petrol and diesel engine? (05)
Q.7 Air at 1 bar and 30o C is to be compressed to 1.2 bar at the rate of 50 m3/min. Find the power required by a Roofs blower (10)
Q.8 A compressor has 150 mm bore and 200mm stroke and the linear clearance is 10 mm. Calculate the theoretical volume of air taken in m3 per stroke when working between 1 bar and 7 bar. Take n=1.25. (10)
Q.9 A cylinder contain steam at a pressure of 7 bar and 0.95 dry. The steam is expandisothermally and reversibly to a pressure of 1.5 bar. Find: 1. the final condition of steam; 2. the change in enthalpy; 3. the change in internal energy; 4. the change in entropy; 5. the heat transferred; and 6. the work done per Kg of steam. (10)
Q.10. An ideal engine is imagined to be working on carnot's. The working fluid received heat at the temperature of 590K. and rejects at a temperature of 295K. Find the theoretical efficiency of the cycle. If the engine working on this cycle absorbs35 kJ/s from the hot body, calculate the net work done per second (10)
GROUP C: All Questions are Compulsory.
Q.11 Fill in the blanks (each question carries 2 marks)
(i) In two stage compression with intercooler, the effect of clearance is
(ii) Mechanical efficiency is the ratio of the ________power to the
(iii) The _________rings are housed in the circumferential grooves provided
on the outer surface of the piston.
(iv) The brake power is the power available at the __________.
(v) Merge test is preferred on a _______petrol or diesel engine.
Q.12 Multiple choice question. (Each question carries 2 marks)
(i) Unit of specific entropy is _____________
(a) bar (b)m3/kg (c) KJ/Kg.K (d) None of this
(ii) Motoring test measures ________________.
(a) B.P (b)I.P (c)F.P (d)C.V
(iii) Heat carried away by exhaust gas _________________.
(a) MgCp (Tg- Tr) (b) MgCv (Tg- Tr) (c) MgCp (Tg+ Tr) (d) MgCv (Tg- Tr)
(iv) 1 bar =________________.
(a) 1 x 105 N/ cm2 (b) 10 x 105 N/ cm2 (c)100 x 105 N/ cm2
(d)1000 x 105 N/ cm2
(v) Morse test is used for __________________.
(a) Finding out I.P. (b) Finding out dryness fraction (c)Calculation of Entropy (d) None of above
Q.13 True or false (each question carries 1 mark).
(i) In a boiler various heat losses take place the biggest loss is due to moisture
(ii) If the flow of air through the compressor is perpendicular to its axis, then
it is a centrifugal compressor.
(iii) The isentropic process on h-s diagram will be a vertical line.
(iv) The efficiency of carnot cycle may be increased by increasing the
(v) A compressor mostly used for supercharging of I.C engines is roots
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