Basic Mechanical Engineering (BT-203) - Important Questions

Explain the classification of engineering materials, including what alloys are and their applications.

Explain the tensile test procedure / experimental setup and the stress-strain diagram for ductile materials (including comparison with brittle materials) with neat sketch

Define important mechanical properties of engineering materials (e.g., strength, ductility, toughness, brittleness, tensile strength) with examples.

Define hardness, explain its purpose and explain hardness testing methods including Brinell hardness test

Numerical on axial tensile loading of a rod to find stress, strain, elongation or Young's modulus using $\sigma = E \epsilon$

Explain the necessity of alloying, what alloy steels are, and how they differ from carbon steels.

Write in detail classification of cast irons along their applications.

Write short note on Hooke's law and modulus of elasticity (as part of choice among micrometer, Newton's law of viscosity, draught)

Numerical on tensile test: determine ultimate stress, breaking stress, true breaking stress and percentage elongation from load, gauge length and diameter data

Explain the effects of alloying elements in alloy steel.

Define Young's modulus, elastic limit and ultimate point

Explain construction and method of using sine bar, including measurement of taper/angle

With a neat diagram explain the main parts of a drilling machine and explain any two operations performed on it.

Explain methods for temperature measurement including working of thermocouple and radiation pyrometer with neat sketches.

Explain application and measurement process using vernier caliper with sketch

Explain the working principle of a drilling machine and its different parts with a line diagram.

Explain the step-by-step flowchart / procedure followed in preparation of sand casting.

Write short notes on vernier caliper, micrometer and dial gauge

Explain the process of Pitot tube for velocity measurement of a fluid with neat sketch.

With a neat sketch explain lathe operations: facing and knurling.

Explain the feed mechanism used in a drilling machine.

Explain method of using slip gauges with neat sketch

Write short notes on any two of casting defects, micrometre, dial gauge, different types of fluids

Describe the construction and working principle of a Pelton wheel turbine with neat sketch.

Explain the basic principle of hydraulic turbines converting fluid energy to mechanical energy and classify/discuss types and applications.

Using continuity and Bernoulli's equation, find the pressure at section 2 of a tapered pipe given diameters, discharge, datum heads, and pressure at section 1.

Write short note on Newton's law of viscosity as part of a choice among several topics.

Explain the construction and working of a single acting / reciprocating pump with neat sketch.

Using Newton's law of viscosity for plane Couette flow between parallel flat plates, determine viscosity, shear force and power from plate velocity, gap, area and shear stress.

Define and distinguish between: i) Uniform flow and non-uniform flow ii) Laminar and turbulent flow iii) Newtonian and Non-Newtonian flow

State Newton's law of viscosity and explain its significance and the relation between shear stress, viscosity and shear rate in Newtonian fluids.

Using Newton's law of viscosity for rotating shaft and sleeve with oil film, calculate power lost due to viscous shear.

Explain what priming is and why it is required in a centrifugal pump.

Explain what a draft tube is and why it is used in a reaction turbine, with neat sketch.

Define Viscosity. What is the importance of viscosity while selecting fluids in various engineering applications?

State the first law of thermodynamics for a closed system undergoing cyclic and non-cyclic processes and its relation to conservation of energy.

Define thermodynamic system and explain open, closed and isolated systems.

What is constant volume process? Derive expressions for the work done, change in internal energy heat transfer and change in enthalpy.

Define internal energy and prove that energy is a property of a system.

Explain thermal equilibrium and state the zeroth law of thermodynamics, including its application to temperature measurement.

Differentiate between boiler mountings and accessories. Discuss the role of boiler accessories in enhancing efficiency and safety in boiler systems.

Explain construction and working of Babcock and Wilcox boiler with neat sketch.

Explain working of Cochran boiler and fusible plug with neat sketches.

Prove that work and heat are path functions.

State the Kelvin-Planck and Clausius statements of the second law of thermodynamics and explain their equivalence.

Derive the expression for the first law of thermodynamics applied to a closed system and define internal energy.

In a boiler trial with given feed temperature, steam pressure and dryness, and coal and water quantities (allowing for change in boiler water level), calculate the actual evaporation per kg of coal and the equivalent evaporation.

Explain the structure and working of a four-stroke diesel engine with a neat sketch.

Explain the structure and working of a two-stroke diesel engine with a neat sketch.

With the help of a neat sketch describe the construction and working of a steam engine?

Explain the working of the Diesel cycle and derive its thermal efficiency.

Explain the processes involved in the Dual cycle with P-V and T-S diagrams.

Explain the structure and working of a four-stroke petrol engine with a neat sketch.

Write short notes on surging, choking and stalling in compressors.

Explain the working principle of the centrifugal compressor.

Derive the expression for thermal efficiency of the Carnot cycle with P-V and T-S diagrams.

Derive the expression for thermal efficiency of the Otto cycle with P-V and T-S diagrams.

Explain the working of a two-stroke petrol engine with a neat sketch.

Write Short note on any two: a) Thermodynamic system, properties and state. b) Working principle of steam Engine c) Casting and Patterns d) Impact testing of materials