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I.C. Engines QP-1

The document contains questions about engine cycles, components, and performance metrics. It asks the reader to draw and compare diesel and dual cycles, discuss differences between CI and SI engines, explain the significance of firing order, and compare CI and SI engine construction. Further questions explore two-stroke vs four-stroke engines, valve and port timing diagrams, definitions and calculations of engine metrics, piston component materials and construction, cylinder head and block construction, and four-stroke engine operation. The final questions derive the efficiency of an air standard diesel cycle and perform calculations for work output and efficiency of a six-cylinder engine running on the dual cycle.

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Sriramulu Jaichandar
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153 views1 page

I.C. Engines QP-1

The document contains questions about engine cycles, components, and performance metrics. It asks the reader to draw and compare diesel and dual cycles, discuss differences between CI and SI engines, explain the significance of firing order, and compare CI and SI engine construction. Further questions explore two-stroke vs four-stroke engines, valve and port timing diagrams, definitions and calculations of engine metrics, piston component materials and construction, cylinder head and block construction, and four-stroke engine operation. The final questions derive the efficiency of an air standard diesel cycle and perform calculations for work output and efficiency of a six-cylinder engine running on the dual cycle.

Uploaded by

Sriramulu Jaichandar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
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PART-A 4*2=8 Marks (Answer All Questions)

1. Draw diesel cycle and Dual cycle P-V diagram.


2. In what aspects four stroke cycle SI engine differ from that of a CI engine?
3. What is the significance of firing order?
4. Compare the construction of CI and SI engine.

PART-B 4*6=24 Marks (Answer All Questions)

5. (a) Compare four stroke and two stroke cycle engines and bring out their relative merits
and demerits.
(OR)
(b) Compare SI and CI engines and bring out their relative merits and demerits.
6. (a) Explain the working of a two stroke petrol engine.
(OR)
(b) With neat sketches explain valve and port timing diagrams.
7. (a) Write short notes on (i) IP (ii) BP (iii) BSFC (iv) BMEP (v) Torque (vi) A/F
(OR)
(b) Write short notes on (i) Thermal Efficiency (ii) Mechanical Efficiency
(iii) Volumetric Efficiency (iv) Relative Efficiency
8. (a) What are the functions of piston pack components? Describe their materials and
construction.
(OR)
(b) Write short notes on (i) Cylinder block (ii) Cylinder head

PART-C 2*9=18 Marks (Answer All Questions)

9. (a) With a neat sketch explain the construction and working of a four stroke petrol engine.
(OR)
(b) Derive an expression for the efficiency of air standard Diesel cycle.

10. (a) A 6-cylinder, 4-stroke engine having bore of 11cm and stroke 16cm consuming 0.18kg
of fuel per minute when working on Dual cycle and running at 1600 rpm. Compression
ratio is 10, pressure and temperature at the beginning of the cycle are 0.95 bar and 45 oC.
Assuming 2/3 of total heat is supplied at constant volume and remaining at constant
pressure Find a) Work output b) Thermal efficiency
(OR)
(b) Explain the construction of valve actuating mechanism and its components. Discuss
in detail the merits and demerits of valve actuating mechanisms that are in current use.

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