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SECOND SEMESTER B.TECH. DEGREE EXAMINATION, MAY/JUNE 2016
ME100 : BASICS OF MECHANICAL ENGINEERING

Max. Marks ; 100 Duration : 3 Hours

PART-A

Each question carries 3 marks :

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Discuss the first law of thermodynamics applied for a process.

Why compression ratio of petrol engine is low compared to diesel engines ?
Differentiate between DBT and WBT. .

What are the desirable characteristics of a good fuel ?

Why alloys are preferred over pure metallic materials in engineering applications ?
Discuss how thin sheets are manufactured ?

Mention the importance of forging.

List and explain any three operations periormed on drilling machine.

PART-B

Answer any two questions from each Module.
Each question carries 6 marks.

10.

Module -।
State and explain second law of thermodynamics. Give its application.

An engine operation on an air standard Otto cycle has a compression ratio equal
to 7. The conditions at the start of compression are 0.1 MPa and 300 K. The
pressure at the end of heat addition is 4 MPa. Determine :

i) thermal efficiency

ii) net work done where Cy = 0.718 kJ/kg, ಗ, = 1.4.

. Sketch and explain the ideal cycle for petrol engines.

൧൩൦.