Download AKTU B-Tech 5th Sem 2015-2016 I.C. Engines Compressors Eme 505 Question Paper

Printed Pages: 4

212 EME-505

(Following Paper ID and Roll No. to be filled in your Answer Book)

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Paper ID : 140525 Roll No.

B.TECH.

(SEM. V) THEORY EXAMINATION 2015-16

IC ENGINES & COMPRESSORS

EME-505

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[Time:3 hours] [Total Marks:100]

Section-A

1. Attempt all parts. All parts carry equal marks. Write answer of each part in short. (10×2=20)
1. What is surging?
2. How the efficiency of an Otto cycle is increased?
3. What is mean effective pressure in I.C. Engine?

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4. Explain the knocking in I.C. Engines?
5. What are the Advantages of using LPG in Car?
6. What is Scavenging?
7. Explain the meaning of ignition advance.
8. What is ram supercharging?

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9. Write down the difference between 2 stroke engine & 4 stroke engine?
10. Why diesel engines have spark plugs in it?

Section B

Attempt any five questions. Each question carries (5×10=50) equal marks. Give neat and clean sketches diagram if and make some choices in Engine.

2. Discuss the effects of gasoline volatility, on engine performance and describe what volatility index? What is petrol injection, advantages and disadvantages?
3. Discuss the effects of compression ratio on engine speed and power and write principle of S.I engine.

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4. Explain the working principle of a magneto ignition system with a neat sketch.
5. Describe the construction of simple carburetor. Explain the system to supply juice during idle and high speeds.
6. Explain the construction and working of simple carburetor in a I. C Engine. What are the requirements of carburetion? what is carburetion equivalents?
7. Elaborate on the describe the physical ignition delay and chemical ignition delay factors affecting delay period and explain the knocking of SI engine.
8. Explain the working of reciprocating compressor with neat sketch.

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Section C

Note: Attempt any two questions From this section. (2×15=30)

10. In a test of a two-cylinder, four stroke petrol engine of 75 mm bore and 110 mm stroke, the following results were obtained at full load and a speed of 1600 rpm :
    • brake drum diameter = 1.25 m
    • average load of both cylinders= 25.24 kg
    • brake cylinder diameter=2.25cm³=1.18 kg/cm
    • by two cylinders

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    Calculate the indicated power of the engine, take the mechanical efficiency of the engine. Compare this with a four-stroke, diesel engine, are same volume of fuel consumption is 4.7 litres/hour. H.V. of.
11. Show advantages of multistage compression with help of PV and TS diagram. Derive optimum pressure ratio for two stage minimum work of compression.
12. A diesel engine has a compression ratio of 20:1 with an inlet of 95 kPa, 290 K, state 1, with volume 0.5 L. The maximum cycle temperature is 1800 K. Find the maximum pressure, the net specific work and the thermal efficiency.

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