18ME15/25
Model Question Paper
First Semester B.E. Degree (CBCS) Examination
Elements of Mechanical Engineering
Time: 3 hrs. Max. Marks: 100
Note: 1.Answer any FIVE full questions, choosing one full question from each module.
2. Use of steam tables is permitted.
MODULE I
1 a Classifydifferent sources of energy with suitable examples. (04 Marks)
b Find the enthalpy of 1kg of steam at 12 bar when steam is dry saturated
steam is 22% wet superheated to 250ºC. Take the specific heat of
superheated steam as 2.25kJ/kgK.
(06 Marks)
c With the help of T-h diagram, explain the generation of steam at constant
pressure.
(10 Marks)
OR
2 a Write short note on global warming Ozone depletion (10 Marks)
b State and Explain Zeroth law, first law and second law of thermodynamics. (10 Marks)
MODULE II
3 a With a neat sketch, explain the working of water tube boiler. (10 Marks)
b Classify Hydraulic pumps and explain the working principle of centrifugalpump
with a neat sketch. (10 Marks)
OR
4 a Classify hydraulic turbines and with a neat sketch explain the working of Francis
turbine.
(10 Marks)
b Explain the functions of Water level indicator Safety valve Super
heater Pressure gauge Feed check valve
(10 Marks)
MODULE III
5 a With the help of P-V diagram, explain the operation of 4-Stroke Petrol engine (10 Marks)
b Following data are collected from a 4-stroke, single cylinder at full load.
Bore 200mm, stroke= 280mm, speed 300 rpm, Indicated mean effective
pressure 5.6bar, Torque on the brake drum 250 fuel consumed
4.2kg/hour, and calorific value of fuel 41000 KJ/kg.Determine Brake power
Mechanical Efficiency Indicated thermal efficiency Brake thermal
efficiency
(10 Marks)
OR
6 a Define the following refrigeration terms
Refrigerant ii) Ton of refrigeration iii) COP iv) Relative COP Refrigerating
effect
(05 Marks)
b Define refrigeration. State the application of refrigeration (05 Marks)
c With the help of a flow diagram, explain the functioning of Vapor Compression
refrigeration cycle. (10 Marks)
USN
Important Note: 1. On completing your answers, compulsorily draw diagonal cross lines on the remaining blank pages.
2. Any revealing of identification, appeal to evaluator and /or equations written e.g, 38+2 40, will be treated as malpractice.
18ME15/25
18ME15/25
MODULE IV
7 a Classify and explain various types of Steel (10 Marks)
b With a neat sketch explain the Arc welding method. (10 Marks)
OR
8 a Derive an expression for length of belt in open belt drive. (10 Marks)
b A shaft running at 100 rpm, is to drive a parallel shaft at 150 rpm. The pulley on
the driving shaft is 350 mm in diameter. Find the diameter of the driven pulley.
Calculate the linear velocity of the belt and the velocity ratio.
(10Marks)
MODULE V
9 a Explain the following machining operations on Lathe machine with suitable
sketches Turning Facing Thread cutting Knurling (10 Marks)
b With a neat sketch explain the working of vertical milling machine (10 Marks)
OR
10 a Explain the advantages and applications of robots in industries. (10Marks)
b Discuss the elements of a CNC system with a neat block diagram. (10 Marks)