Basic Mechanical Engineering (3110006)

BE | Semester 1 
  Winter - 2019|03-01-2020
Total Marks 70

Q1 (a) Define prime movers. Write any four examples of the prime movers.

 Unit : Introduction |  Topic : Prime movers and its types

Q1 (b) Define the terms: Hardness, Toughness, Ductility, Elasticity.

 Unit : Engineering Materials |  Topic : Properties of Ferrous & Nonferrous metals

Q1 (c) List the non-convectional sources of energy. Prepare a short note on solar energy.

 Unit : Energy |  Topic : Solar

Q2 (a) Distinguish between coupling and clutch.

 Unit : Couplings, Clutches and Brakes

Q2 (b) Describe briefly using neat diagrams the types of belt drives.

 Unit : Transmission of Motion and Power |  Topic : Different arrangement and applications of Belt drive

Q2 (c) Explain with neat sketch the Vapor Compression Refrigeration system. Also draw p-h and T-s diagram for the same.

 Unit : Refrigeration & Air Conditioning |  Topic : Vapor compression refrigeration system

OR

Q2 (c) Classify Air Compressors. Explain construction and working of centrifugal pump with sketch.

 Unit : Pumps |  Topic : Rotary and Centrifugal pumps

Q3 (a) Prove that the difference between two specific heats of gases is equal to its characteristic gas constant.

 Unit : Properties of gases |  Topic : Relation between cp and cv

Q3 (b) Differentiate between gas constant and Universal gas constant.

 Unit : Properties of gases |  Topic : Gas constant

Q3 (c) One kg of gas at a pressure of 100 kPa and temperature of 17°C is compressed isothermally in a piston-cylinder arrangement to final pressure of 2500 kPa. The characteristic gas equation is given by the relation pV = 260 T per kg where T is in Kelvin. Find out (1) Final Volume (2) Compression Ratio (3) Change in enthalpy (4) Work done on the gas.

 Unit : Properties of gases

OR

Q3 (a) One kg gas is compressed adiabatically by following the law pV = C from initial temperature of 290 K. The initial pressure of gas is 1 bar. The initial and final volumes of gas are 0.50 m3 and 0.05 m3 respectively. Find the final temperature and pressure of gas. Assume γ =1.4.

 Unit : Properties of gases

Q3 (b) Write the uses of Steam Tables.

 Unit : Properties of Steam |  Topic : Use of steam tables

Q3 (c) Find the internal energy of 1 kg of steam at a pressure of 15 bar when steam is (1) Super-heated at a temperature of 400°C and (2) Wet with dryness fraction of 0.9. Take specific heat of superheated steam as 2.1 kJ/kg-K.

 Unit : Properties of gases

Q4 (a) A diesel engine works on Diesel cycle with a compression ratio of 15 and cut off ratio of 1.75. Calculate the air standard efficiency. Assume γ = 1.4.

 Unit : Heat Engines

Q4 (b) Derive the equation for air standard efficiency of Otto cycle.

 Unit : Heat Engines

Q4 (c) The following readings were observed during a test on Two Stroke Single Cylinder Diesel engine:
Bore = 22 cm Stoke = 28 cm Speed = 350 rpm Net brake load = 65 kg Effective brake drum diameter = 100 cm Mean Effective Pressure = 3 bar Fuel consumption = 4 kg/h Calorific value of fuel = 43 MJ. 
Calculate: (1) Indicated Power (2) Brake Power (3) Mechanical Efficiency (4) Brake thermal Efficiency

 Unit : Internal Combustion Engines

OR

Q4 (a) Classify I.C. Engines.

 Unit : Internal Combustion Engines |  Topic : Classification

Q4 (b) Determine the brake thermal efficiency of an engine with following data:
Brake Power = 80 kW, Fuel consumption rate = 20 kg / hour, Calorific value of the fuel = 43 MJ / kg.

 Unit : Internal Combustion Engines

Q4 (c) Discuss the construction and working of four stroke Petrol engines.

 Unit : Internal Combustion Engines |  Topic : Four-stroke/ two-stroke cycle Petrol/Diesel engines

Q5 (a) Define the terms ‘Refrigeration’, “Ton of Refrigeration” and “Coefficient of Performance”.

 Unit : Refrigeration & Air Conditioning

Q5 (b) What is boiler? Compare fire tube boiler with water tube boiler.

 Unit : Steam Boilers |  Topic : Introduction

Q5 (c) Explain with neat sketch, the construction and working of (1) Fusible plug (2) Air preheater.

 Unit : Steam Boilers |  Topic : Functioning of different mountings and accessories.

OR

Q5 (a) Differentiate between reciprocating compressor and rotary compressor.

 Unit : Air Compressors

Q5 (b) Differentiate between boilers mountings and accessories.

 Unit : Steam Boilers |  Topic : Functioning of different mountings and accessories.

Q5 (c) Discuss the construction details and working of Cochran boiler with neat sketch.

 Unit : Steam Boilers |  Topic : Cochran