LJ Polytechnic, Ahmedabad

Mechanical Engineering Department

Page 1 of 2

1. Difference between Two Stroke and Four Stroke Engine.

2. Explain the working of Four Stroke Diesel Engine with neat sketch.

3. Explain the working of Two Stroke Petrol Engine with neat sketch.

4. State Purpose of governing system in IC Engine and Explain Hit and Miss governing.

5. Compare Air cooling and Water Cooling system for IC Engine.

6. Explain Splash Lubrication System of IC Engine.

7. Explain Wet and Dry Lubrication System of IC Engine.

8. Explain Fuel supply system for IC Engine.

9. Draw a Diagram of Spark Plug and State reason for failing of Spark Plug.

10. Explain Scavenging and its methods.

11. Draw neat sketch of Battery Coil Ignition System and Magneto Ignition System.

12. Draw neat sketch of theoretical and actual valve timing diagram for Four Stroke Petrol

Engine.

13. Draw neat sketch of Carburetor of IC Engine.

1. Difference between CI and SI Engine.

2. Define: Mean Effective Pressure, Brake Power, Indicated Power, Mechanical Efficiency,

Clearance Volume, and Compression Ratio.

3. Explain Common rail direct injection system (CRDI) system for Diesel Engine.

4. Explain working of fuel pump with neat sketch.

5. Explain Multi point fuel injection system (MPFI) system.

6. Define Supercharging? What is its purpose?

7. Advantages and disadvantages of natural gas.

8. Write short note on Biodiesel.

9. List and Explain Various types of Alternative Fuels

10. Explain the working and construction of LPG/CNG Conversion kit.

Subject: Thermal Engineering - II (3351901)

Module: 1 (Internal Combustion Engine)

Module: 2 (Internal Combustion Engine/Alternative Fuels)

LJ Polytechnic, Ahmedabad

Mechanical Engineering Department

Page 2 of 2

1. Explain the working principle of Window Air Conditioning with neat sketch.

2. Explain the working principle of Split Air Conditioning with neat sketch.

3. Draw schematic diagram of VCRS with name of each components.

4. Explain Vapour Absorption Refrigeration System (VARS) with neat sketch.

5. Define Refrigerant and Describe commonly used Refrigerant with properties.

6. Classify Evaporator and Explain Dry expansion evaporator in details.

7. Explain reversed Carnot cycle for vapour medium on P-V and T-S diagram.

8. Explain Brayton cycle / Reversed Joule / Bell Coleman cycle with PV and TS diagram.

9. Comparison between Hermetically Sealed Compressor and Open Compressor.

10. Define:

i. Refrigeration

ii. Unit of Refrigeration ( Ton of Refrigeration)

iii. COP of Heat pump

iv. COP of Refrigeration

11. List various expansion devices used in VCRS and explain any one with sketch.

12. Comparison between Air Conditioner and Air Cooler.

13. Draw psychrometric chart, indicate all properties on it clearly.

14. Define:

i. Relative humidity

ii. Wet bulb temperature

iii. Dry bulb temperature

iv. Degree of saturation

v. Specific humidity

vi. Dew point temperature

15. State the following process on psychrometric chart and explain:

1. Heating with humidification.

2. Cooling with dehumidification.

16. Factors affecting the location of cold storage.

17. Draw neat sketch of water cooler.

Module: 3 (Refrigeration and Air Conditioning)

LJ Polytechnic, Ahmedabad

Mechanical Engineering Department

Page 1 of 3

1. Define Design. Explain types of Design.

2. List main factors influencing design of machine elements.

OR

What are the general considerations in machine design?

3. List Types of Load and Stress. Write difference between bearing stress and contact stress.

4. What is stress concentration?

5. Define Factor of Safety. Explain factors affecting the value of Factor of safety.

6. What is Standardization? List advantages of it.

7. Define preferred numbers. State advantage of it.

8. Standardize six shaft speeds between 25 rpm to 2000 rpm using preferred numbers.

9. Determine the smallest size of a hole that can be punched in a 12 mm thick plate, having

an ultimate tensile strength of 310 N/mm2.The allowable compressive stresses for the

punch is 900 N/mm2.

10. Classify pressure vessels. State Application and uses of it.

11. State main considerations for the design of pressure vessels.

12. State the assumptions made in the design of thin and thick cylinder.

13. A thin cylinder pressure vessel of 500 mm internal diameter and 20 mm thickness is

subjected to an internal pressure of 2 N/mm2. Find hoop stress, longitudinal stress and

maximum Shear stress.

14. A hydraulic cylinder is subjected to an internal pressure of 15N/mm2.Internal diameter of

the cylinder is 220 mm.Determine the thickness of the cylinder if the permissible stress

for cylinder is 30 N/mm2.

1. Difference Between Cotter Joint & Knuckle Joint.

2. Sketch (1) Single Riveted Lap Joint.(Two Views) (2) double cover, double riveted butt

joint with zigzag pattern.

3. Differentiate between V-thread and square thread

4. State advantages of power screw.

5. List application of Cotter joint and knuckle joints.

6. State any four machine elements subjected to direct stress.

Subject: Design of Machine Elements (3351902)

Module: 1 (Introduction, Design of pressure vessels,)

Module: 2 (Design of machine elements subjected to direct stress, Design of machine elements

subjected to bending stress)

LJ Polytechnic, Ahmedabad

Mechanical Engineering Department

Page 2 of 3

7. A cotter joint is designed to resist a load of 50 kN which acts along the axes of the rods

connected by the cotter. The material of the rod and cotter is same and tensile, crushing

and shear stresses are 220,400 and 110 MPa respectively. Find rod diameter‘d’, spigot

diameter ‘d1’, and cotter thickness ‘t’ of the joint. Assume Factor of safety=4.

8. A knuckle joint withstands a tensile force of 12kN.The material of the joint has a tensile

strength of 250 N/mm2.factor of safety=5.Compressive strength is 250 MPa, shear

stress=125N/mm2.Find (1) rod diameter (2) diameter of the knuckle pin (3) thickness of

single eye end.

9. Find the efficiency of the single riveted lap joint of 6 mm plates with 20 mm diameter

rivets having a pitch of 50 mm if ultimate tensile, shear and crushing stress is 120, 90 and

180 MPa respectively.

10. 1. In a double riveted butt joint with two equal cover strips, having zigzag

arrangement of riveting the thickness of the plate 9 mm. Consider allowable tensile

, crushing and shear stress are 100 MPa,150 MPa and 80 MPa respectively. Calculate :- i) diameter of rivet and ii) pitch of rivet joint.

11. Define lever. Explain types and application of levers based on number of fulcrums.

12. Draw neat sketch of bell crank lever and exhaust valve lever and label its parts.

13. State fundamental equation of pure bending with notations.

14. State the materials of leaf spring used for automobiles.

15. State types and application of leaf spring.

16. 1. Design a fulcrum pin of a bell crank lever to lift a load of 2250 N acting at the end

of 125 mm long arm. The effort is applied at the end of 150 mm long arm. Allowable

shear stress and bearing pressure for pin are 70 MPa and 10 MPa respectively. Take L/D

= 1.25 for pin.

1. State requirement of good couplings.

2. State the design steps of sleeve/Muff coupling.

3. State types of coupling and application of couplings.

4. List types of keys and their uses.

5. Write the equation by which angle of twist for a shaft is calculated.

6. 1. A solid shaft is transmitting 1 MW power at 240 R.P.M. Determine diameter of shaft if

maximum torque transmitted exceeds mean torque by 20%. Assume maximum allowable

shear stress as 60 MPa. 7. 2. A hollow shaft having 240 mm internal and 320 mm external diameter rotates at 120 rpm

and transmit 3000 hp power. Determine the stress induced in the shaft.

Module: 3 (Design of machine elements subjected to Direct and twisting moments, Design of

machine elements subjected to Direct and Bending moments, Selection procedure of

bearings)

LJ Polytechnic, Ahmedabad

Mechanical Engineering Department

Page 3 of 3

8. 1. A C.I flanged coupling is transmitting 11 KW at 500 RPM permissible shear stress

for the shaft and bolt material is 60 MPa and 40MPa respectively, permissible crushing

stress for the both is 100MPa and permissible shear stress for hub material is 6 MPa.

Design for 25 % overload capacity. Determine the (i) shaft diameter, (ii) diameter of

Hub, (iii) No. Of bolts, and (iv) bolt diameter. Take necessary assumptions.

9. Define Eccentric Loading. List out machine elements subjected to eccentric loading.

10. Difference between Journal bearing & Rolling Bearing.

11. Sketch an antifriction bearing and label its different elements.

12. Define antifriction bearing, journal bearing, Bearing Characteristic Number & Bearing

Life.

13. Give names of different types of Antifriction Bearings.

14. State commonly used bearing materials.

LJ Polytechnic, Ahmedabad

Mechanical Engineering Department

Page 1 of 2

1. Define: Machine tools, Speed, Feed, Depth of cut & Metal removal rate

2. Explain the need and importance of manufacturing engineering III.

3. Write short note on Glazing, Loading.

4. Write short note on trueing, Dressing.

5. List various super finishing processes. Explain Honing Process and lapping Process.

6. List out Various Centerless grinding operation. Explain Both.

7. State meaning of “51A 40 M7 V25”.

8. What is balancing of grinding wheel? State the need for balancing grinding wheel.

9. What is abrasive? State the properties of abrasive materials.

10. State different grinding Operations and explain any one.

11. State different grinding machines and explain Tool and cutter grinder.

12. Explain different types of grinding wheel.

1. Classify the various Non-Conventional machining methods. Explain, Why Non-Conventional

machining methods are used? 2. Differentiate between Conventional & Non-Conventional machining methods.

3. Explain the working principle of Electro Discharge Machining (EDM) process.

4. Explain Ultrasonic machining with figure.

5. Explain Abrasive Jet machining with figure.

6. Write short note on Laser Beam Machining.

7. Difference between (1) EDM & ECM, (2) EBM and LBM.

8. List need of Micro Electro Mechanical System (MEMS).

9. What is Lithography?

10. State the function of dielectric fluid

Subject: Manufacturing Engineering-III (3351903)

Module: 1 (Introduction, Grinding & Super finishing processes,)

Module: 2(Non-conventional and advance methods of machining)

LJ Polytechnic, Ahmedabad

Mechanical Engineering Department

Page 2 of 2

1. Differentiate Gear generating process & Gear forming process.

2. List the various methods of Gear manufacturing & explain any Gear milling.

3. Describe classification of Gear manufacturing process. List the methods of Gear generating &

explain any ONE.

4. Explain gear hobbing with neat sketch.

5. Why gears are finished? Name different finishing operations performed on gear. Explain

Gear shaving in brief.

6. 1. Write short note on Thread chasing. 7. List methods of Thread manufacturing and Explain thread rolling and thread milling.

8. Show the various elements of thread in the sketch of “V” thread.

9. Draw a neat sketch of Broach tool.

10. Briefly explain pull broaching process and push broaching process.

11. Draw sketch of Single column and double column Jig boring machine & Explain its

parts.

12. Differentiate between standard machine tools and special purpose machine tools.

Module: 3 (Gear manufacturing and finishing processes, Thread

production methods, Broaching, jig boring and special purpose machine

(SPM) tools)

LJ Polytechnic, AhmedabadMechanical Engineering Department

Page 1 of 2

1. Define: Industrial Engineering, Production, Production System, Productivity2. Explain various methods of increasing productivity (OR Briefly state how productivity

can be increased) and explain factors affecting productivity.3. List various types of plant layouts and State advantages and limitation of process type

and product type plant layout.4. Classify material handling equipment. How material handling system is important in

industry?5. Explain Ergonomics in brief. Write the objectives of ergonomics.6. Explain in brief Total Quality Management (TQM)7. Explain Total Quality Cycle (TQC).8. Write short note on zero defect and JIT (Just In Time).9. Explain concept of Re-engineering and Kaizen in brief.

10. Explain the importance of ISO 9000.11. Explain the concept of six sigma.

1. State various steps to carry out method study and explain each one briefly.2. State objectives of method study.3. Explain normal and maximum work area with neat sketch.4. What is usefulness of man and machine chart. How these charts are prepared?5. Explain Pre-determined motion time system(PMTS) and Synthesis method of work

measurement.6. Explain in brief SIMO chart.7. List various charts and diagrams used in method study.Draw the Standard symbols used

in process chart.8. Define Therbligs and list and draw any six therbligs symbols.9. Explain String diagram with neat sketch.

10. What is micromotion study and state its objectives. List time measuring equipment.11. A stopwatch time study was carried out by an Industrial Engineer for manufacturing a

mechanical component in a workshop. The observations werenoted as under.Loading time : 1.9 min. Machining time : 8.2 min.Unloading time : 0.7 min. Inspection time : 0.5 min.Overall rating of cycle : 115% , Allowance : 15%Calculate (i) Total observed time (ii) Basic time (iii) Standard time (iv) Total no. ofpieces produced in 12 hrs. shift.

Subject: Industrial Engineering (3351904)

Module: 1Ch-1 Introduction to Industrial EngineeringCh-5 Plant Layout And Material Handling EquipmentCh-6 Recent trends in Industrial Engineering

Module: 2Ch-2 Work Study

LJ Polytechnic, AhmedabadMechanical Engineering Department

Page 2 of 2

1. Draw neat sketch of normal distribution curveand explain in brief. Statepercentageareacovered under various specification limit.

2. What is reliability?Listvarious factors affectingreliability.3. Differentiate between reliabilityand qualitycontrol.4. DefineSQC andListvarious Statistical QualityControl (SQC) toolsand explain anyone in

brief.5. From the datagiven below find mean and standard deviation

Class 1-5 6-10 11-15 16-20 21-25 26-30 31-35 36-40

Frequency 5 10 14 22 13 10 05 03

6. Calculate mean,mode, median and spread (Range) for observations 7, 8, 4, 3, 6, 9, 4,5

7. Differentiate between attribute and variable quality.8. Draw the sampling plan N=2400, n1=150 a1=5 r1=8 n2=150, a2=9 ,r2=10

Module: 3Ch-3 Quality AssuranceCh-4 Statistical Quality Control

LJ Polytechnic, Ahmedabad

Mechanical Engineering Department

Page 1 of 3

Subject: Estimating, Costing & Contracting (3351905))

Module: 1 (Ch-1: Introduction, Ch-2:Break Even Analysis)

1. Define following: a) Market value b) Scrap value c) Book value d) Salvage value

e) Obsolescence f) Depreciation g) Breakeven Point h) Safety of margin i) Estimating

j) Costing k) Contracting l) Fixed cost m) Variable cost

2. Represent the cost of components by a block diagram. Explain different types of direct

cost.

3. 1) State the quality of Estimator.2) List different elements of Cost.

4. State different methods of overhead allocation and explain any two of them.

5. List out and explain methods of depreciation. State the causes of Depreciation.

6. Need or importance of BEP in industry. Explain the effect of various parameters on

breakeven point.

7. Give advantages and limitations of Break Even Point.

8. Calculation of BEP analytically.

9 Find out the sales price of a steel chair if prime cost of 1000 chairs is Rs. 150000. Factory

overheads is 40% of the prime cost, administrative overheads is 30% factory cost and

sales overheads is 20% of office cost and profit is 10% of total cost.

10. The market price of a lathe is Rs. 50000.The distributor is given 10 % discount. Selling

expenses are equal to factory expenses. If material cost, labor cost and factory over heads

are in the ratio of 1:4:2 and material cost is Rs. 4000, find the profit released on the lathe

machine.

11. Purchase price of a machine is Rs. 60000 and its expected useful life is 20 years. Its scrap

value is Rs. 20000. If 5% interest is charged on depreciation fund, compute the

depreciation rate by straight line method and sinking fund method.

12. Find out the Break-even point analytically(mathematically) from the following data-

i)Total Sales = Rs.70,000 ii)Variable cost = Rs.49,00,000 iii)Fixed cost = Rs.12,00,000

iv)No. of components = 35,000.

13. Fixed cost in a factory is Rs 10,000 per year, the variable costs are 2.00 Rs per unit and

the selling price is Rs 4.00 per unit, Calculate Breakeven point, Safety of margin and

profit.

LJ Polytechnic, Ahmedabad

Mechanical Engineering Department

Page 2 of 3

Module: 2 (Ch-6: Estimation of Process Cost, Ch-7: Budgeting and Contracting)

1. Explain various accounting terminology: a) book value b) net present value c) work in

progress d) gross domestic product e) balance sheet terminology.

2. Define the following terms-1) Budget 2) Budgetary Control 3) Contract 4) Tendering

5) Specification 6) Security Bond 7)Deed 8)Tender form

3. List and explain different types of Contract in detail.

4. List and explain different types of Budget in detail.

5. List and explain different types of Tendering in detail.

6. Gives objective and advantage of budget.

7. Gives characteristics’ and advantages of contract.

8. Explain all provision of different conditions in a contract.

9 Write the procedure of estimating cost of ice per unit weight, produced in ice plant.

10. Write the procedure of estimating cost of diesel generator and thermal power plant.

11. The cost of active wheel washing powder packed in 1 kg. Pouch is Rs.26. The plastic

material for pouch cost Rs.1 per pouch. An operator is packing 500 pouches in a shift of 8

hours. If operator is paid Rs.150 per 8 hours shift. Estimate pouch packaging cost

assuming interest & depreciation. Power cost per pouch is Rs.0.15.

12. One ammonia refrigerant ice plant produce 160 kw refrigerating effect. The heat rejection

theoretically by evaporator is 1000 KJ / kg. Theoretical compressor input is 185 KJ/kg.

Mechanical efficiency of compressor is 85 %.Actual heat absorption in cold chamber is

80 %. If Power cost per unit is Rs.10 and labor cost is Rs 2000/day and overhead cost =

Rs. 5000/day find out ice production rate per kg. Plant is working for 24 hours.

LJ Polytechnic, Ahmedabad

Mechanical Engineering Department

Page 3 of 3

Module: 3 (Ch-3: Cost Estimation in Welding, Ch-4: Cost Estimation in Forging and Casting,

Ch-5: Cost Estimation in Machine Parts)

1. What are the factors affecting the welding cost?

2. Write the procedure for estimation of material cost in gas cutting/welding.

3. State and explain various types of forging and forging operations.

4. State different allowances given on the pattern and explain each in short.

5. Define forging and Explain different types of losses in forging process.

6. Define the following terms-1)Forging 2)Casting 3)Pattern allowance 4) ) Shape weight 5)

Net weight 6) Gross weight

7. Define the following terms: a) cutting speed b) feed c) depth of cut d) over travel e)

Approach length.

8. Four plates each of 1000×500×5 mm are to be gas cut from a M.S plate of size

2000×1000×5 mm. Find the cutting cost from the following.

Oxygen consumption = 5 m3/hr.

Cutting speed = 12 m/hr

Cost of acetylene = 100 Rs./m3

Acetylene consumption = 2 m3/hr.

Cost of O2 = 30 Rs./ m3

Labour = 40 Rs./hr. (text book: page no. 104)

9. Determine formula for economic batch quantity.

10. Find machining time for different operations like: turning, knurling, facing, drilling,

reaming, boring, threading, tapping, chamfering.

11. A slot of 2 cm deep and 10 cm long is to cut in a M.S job with a milling cutter of 8 cm

diameter & rotating at 120 RPM. If milling is done in 2 cut and feed per revolution is 0.05

cm. then calculating the milling time. (Text book page no.: 194)

12. Estimate the time required to drill 4 holes of 1 cm diameter in a plate. Hole depth is 2 cm,

cutting speed is 15 m/min and feed is 0.01 cm/rev. (text book page no.: 183)

LJ Polytechnic, Ahmedabad

Mechanical Engineering Department

Page 1 of 2

1. What is self-employment? Give advantages and disadvantages of it.

2. Explain need of self-employment in Indian job market.

3. Explain area of self-employment in mechanical engineering.

4. List and explain qualities of good entrepreneurship.

5. Explain need/importance of entrepreneurship development.

6. Explain special qualities of a diploma holder as a self-employer and explain any three.

7. What is cost consciousness?

8. What is customer expectation? Give its importance. And methods to measure it.

9. List and explain types of enterprise and explain with advantages and disadvantages.

10. Define creativity and innovativeness and explain methods to develop it.

1. Short note on 7m resources.

2. List and Explain 4P’s.

3. Define marketing and state its importance.

4. Explain methods of market survey.

5. Short note on feasibility study.

6. Explain need of market survey in project planning.

7. What is detailed project report (DPR)?

8. What are advantages and disadvantages of case study?

9. Explain important features of case study.

10. List State level agencies which help MSME and State functions of district industrial

center (dic).

11. Define MSME. List and explain National level agencies which help MSME.

Subject: Self Employment and Entrepreneurship Development (3351906)

Module: 1 (Introduction to self-employment)

Module: 2 (Project Proposal Planning, Case Study and MSME)

LJ Polytechnic, Ahmedabad

Mechanical Engineering Department

Page 2 of 2

1. What is capacity planning? Explain its importance.

2. Differentiate between monopoly and competition.

3. Explain various stages of project planning.

4. Short note on technology life cycle.

5. List types of plant layout and explain any one with advantages and disadvantages.

6. Explain factors affecting plant layout.

7. Explain concept of product selection.

8. Short note on SWOT analysis.

9. List external sources of risk in enterprise.

10. Explain methods of risk management.

Module: 3 (Project Setup Planning and Risk Management)