JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III FUNDAMENTALS OF MECHANICAL ENGINEERING Previous Question Paper (January/February - 2023 - R16)

Write the statement of Zeroth law.

List out various types of bio-fuels.

Define Boyle's law.

Explain the use of steam calorimeters.

Draw the P-V diagram of Otto cycle.

Define and explain a heat engine.

What is surging phenomenon?

Differentiate refrigeration and air conditioning.

List out the applications of Friction drive.

What is Abrasive material?

Obtain an expression for the work done during a polytrophic process.

List out the applications of Energy sources Fossil fuels and nuclear fuels.

The properties of a closed system change as per the relation between pressure and volume as pV = 5 where p is in bar V is in m3. Calculate the work done when the pressure increases from 2 bar to 8 bar.

Why work and heat are path functions.

A quantity of water of mass 0.05 kg undergoes an isothermal expansion process form an initial state of 2 bar and 90°C to a point at which pressure reaches to 0.1 bar. Sketch the p-V and T-V diagram for the process.

Differentiate Babcock and Wilcox boiler.

A cylinder contains 0.2 kg of water at a pressure of 0.75 bar and temperature 50°C behind a leak proof piston. Heat is added to water while maintaining a constant pressure (isobaric process) until temperature reaches 135°C. Sketch the p-V and T-V diagrams for the process.

Explain functioning of different mountings and accessories of boilers.

Write characteristic features of a heat engine.

Difference between two stroke engines and four stroke engines. If an engine running at 1000 rpm how many power strokes can a two stroke and four stroke engines give respectively?

A heat engine absorbs 100 J of heat from the hot reservoir and releases 60 J of heat to the cold reservoir during each cycle. Calculate i) What is its efficiency? ii) If each cycle takes 0.50 sec, find the power output of this engine.

Differentiate Indicated power and Brake Power.

Draw and explain the operation of Reciprocating pump.

A standard air refrigeration cycle has -15°C, 110 kPa into the compressor, and the ambient cools the air down to 30°C at 400 kPa. Find the lowest temperature in the cycle, the low T specific heat transfer and the specific compressor work.

Draw and explain the working of Centrifugal pump.

An air standard refrigeration cycle leads air to the compressor at 120 kPa, 268K with a compression ratio of 4:2:1. The temperature after heat rejection is 301 K. Find the COP and the highest temperature in the cycle.

Explain the power transmission mechanism in shaft and axle with neat sketch.

Difference between flat belt and v-belt.

Explain the applications of Universal couplings.

What is non-ferrous metals? List out its applications.