What are the advantages and disadvantages of two stroke and four stroke engines. (any four points)
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What are the advantages and disadvantages of two stroke and four stroke engines. (any four points)
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- Explain the mechanical efficiency of two and four stroke engines note:Use whatever laws or graphics you need to illustrate the answerTwo automobile engines have the same total displacement volume and the same total power produced within the cylinders. List the possible advantages of: (a) A V6 over a straight six. (b) A V8 over a V6. (c) A V6 over a V8. (d) An opposed cylinder four over a straight four. (e) An in-line six over an in-line four.02/ Choose the correct answer from below 1-With an increase of the number of cylinders in a multi cylinder engine the power to weight ratio (a) Decreases. (b) Increases. (c) Remains unaffected. (d) None of the mentioned. 2- Maximum torque is generated by an engine when (a) it runs at lowest speed (b) it develops maximum power (c) it consumes maximum fuel (d) it runs at maximum speed 3- The brake power (B.P.) of the engine is given by (where W= Brake load or dead load in newtons, L= Length of arm in meters, N = Speed of engine in r.p.m., S= Spring balance reading in newtons, D = Dia. of brake drum in meters, and d Dia. of rope in meters). a) B.P = (WL x 2RNV60 watts b) B.P= [(W-S) RDNJ60 watts e) B.P = [(W - S) a (D+d) NJ/60 watts 4- It is assumed that all the processes of an air standard cycle are (a) Reversible. (b) Irreversible. (c) Adiabatic. 5- The volumetric efficiency of a well-designed engine may be. (a) 30 to 40%. (b) 40 to 60% (c) 60 to 70% (d) 75 to 90%. %3D d) All of these.…
- 02/ Choose the correct answer from below 1- With an increase of the number of cylinders in a multi cylinder engine the power to weight ratio (a) Decreases. (b) Increases. (c) Remains unaffected. (d) None of the mentioned. 2- Maximum torque is generated by an engine when (a) it runs at lowest speed (b) it develops maximum power (c) it consumes maximum fuel (d) it runs at maximum speed 3- The brake power (B.P.) of the engine is given by (where W Brake load or dead load in newtons, L Length of am in meters, N= Speed of engine in r.p.m., S Spring balance reading in newtons, D Dia. of brake drum in meters, and d Dia. of rope in meters). a) B.P (WL x 2aNV60 watts b) B.P = [(W- S) nDNJ/60 watts c) B.P [(W-S) a (D+d) NJ/60 watts 4- It is assumed that all the processes of an air standard cycle are (a) Reversible. 5- The volumetric efficiency of a well-designed engine may be. (a) 30 to 40% d) All of these. (b) Irreversible. (c) Adiabatic. (d) Isothermal. (b) 40 to 60%. (c) 60 to 70% (d) 75 to…Explain the classification of reciprocating engines according to cylinder arrangement? Represent each type with the help of suitable diagram?7. How do you designate the size of an engine? 8. What will be the total piston displacement in a two-cylinder 100 mm x 130 mm engine? 9. If each cylinder of the above engine has a clearance volume equal to one fifth of the total cylinder volume, then compute: a) the clearance volume; b) the compression ratio. 10. Sketch the operation of a four-stroke petrol engine, explaining the events at each stage. How will the events differ from those of a diesel engine? 11. Why is there a power stroke for every down stroke of piston travel in a two-stroke engine? At what interval does the power stroke occur in a four-stroke engine? 12. Assuming a firing order of I four-cylinder engine, complete the events in the other cylinders if the events for cylinder l'are as shown in Table 2.3. 3 2 for a
- Discuss the comparison of 4-stroke and 2-storke cycle engine (provide drawing if necessary)Two automobile engines have the same total displacement volume and the same total power produced within the cylinders. List the possible advantages of: (a) A V6 over a straight six. (b) A V8 over a V6. (c) A V6 over a V8.Describe a 4-stroke compression ignition engine operation with neat sketches.