B.M.E. (Basic Mechanical Engineering)

This type of boiler is used in sugar mills and textile industries where, the steam is    required for power generation as well as for the process work. This boiler is also used in chemical industries. Specifications :  The specifications of one such boiler are as under.            Shell diameter            : 2 to 3 m            Length of shell           : 7 to 9 m  Working pressure      : 16 bar  Steam capacity          : 8000-9000 kg / hr        Efficiency                  :  50 to 70 % Characteristics of boiler :  1.It is horizontal.  2.  It is stationary. 3.  It is fire tube type. 4.  It is internally fired. 5.  It is multi tube boiler. 6.  It has natural circulation of hot gases. 7.  It burns solid fuel. 8.  It is a medium pressure boiler. Working :  The water is fed into the boiler shell through the feed check valve.  The level of the water is adjusted with the help of water level indicator.  Coal is added to the grate through the fire hole.  The coa

BABCOCK AND WILCOX BOILER  This boiler is exclusively used when pressure is above 25 bar and capacity requirement is in excess of 7000 kg of steam/hr. It is a water tube boiler. It is used to operate at high pressures. Specifications :  The particulars relating to one such boiler is given as under.  Diameter of drum   : 2000 to 4000 mm  Length    : 6000 to 9000 mm  Size of the water tubes  : 76.2 to 101.6 mm  Size of the upper header tubes : 38.4 to 57.1 mm  Maximum working pressure : 42 bar  Maximum steaming capacity : 40,000 kg/hr  Efficiency    : 60 to 80 % Characteristics of boilers  1.It is horizontal. 2. It is stationary. 3. It is water tube. 4. Number of tubes are many. 5. It is externally fired. 6. It is has natural circulation for water. 7. It has a forced circulation for air and hot gases. 8. It uses both solid as well as liquid fuel. 9. It is high pressure boiler. Working:  The water is fed into the boiler shell through the feed check valve.

COCHRAN BOILER  : It is one of the best types of vertical multi tubular boiler. It is fire tube boiler. It is a popular portable boiler. It occupies very small floor area. Specifications : The specifications of one such boiler are as under.                        Shell diameter             :  2.75m     Height                         :  5.75m Working pressure       :  6.5 bar ( Maximum 15 bar ) Steam capacity           :  3500 kg / hr  Heating surface area  :  120 m2 Efficiency                    :  70% to 75% Characteristics of the boiler : 1. It is vertical. 2. It is portable. 3. It is fire tube boiler. 4. It is multi tube boiler.  5. It is internally fired. 6. It has natural circulation. 7. Solid as well as liquid fuel can be burnt. 8. It is horizontal tube boiler. Construction Details :  It consists of : 1. Cylindrical shell   2. Fire box    3. Grate  4. Ash pan  5. Flue pipe 6. Combustion chamber  7. Smoke chamber  8. Steam space Mountings :  1. 

Government Engineering College, Palanpur Mechanical Engineering Department  Basic Mechanical Engineering (3110006) Chapter: 7                                                                                 Internal Combustion Engine Define the following terms: (i) Scavenging, (ii) Compression ratio, (iii) Indicated thermal efficiency. (03) (Summer 2018)   With neat sketch describe the working of two stroke diesel engine.(07) (Summer 2018) Give comparison between Petrol and Diesel Engine. (03) (Summer 2017) List advantages and disadvantages of two stroke engines over four stroke engines. (03) (Winter 2017) Compare: S.I. engines and C.I. engines. (04)  (Summer 2016)  Define following terms: swept volume, clearance volume, stroke length, compression ratio. (04)   (Winter 2016) A six cylinder 4 stroke I.C. engine is to produce 95 kW brake power at 800 rpm. The stroke to bore ratio is 1.25, mean effective pressure is 7 bar. Determine the bore and stroke of the eng

Government Engineering College, Palanpur Mechanical Engineering Department  Basic Mechanical Engineering (3110006) Chapter: 6                                                                                                   Steam Boilers 1.       Explain Green’s Economizer with neat sketch. (04) (Summer 2018) 2.    Explain with neat sketch the construction and    working of Babcock and Wilcox boiler.Show path of the gases and water in it. (07) 3.      Give classification of Boilers. (04) (Summer 2018) 4.     Draw the figure of Cochran boiler and explain its construction and working. (07) (Summer 2017,2016) (Winter 2017) 5.      What is boiler mountings and accessories? Also give the list of it.   (04) (Summer 2017) (Winter 2018) 6.       Explain the difference between boiler mountings and accessories.(03) (Summer 2016) 7.      With neat sketch explain the construction and working of     (i) Fusible plug and (ii) Air pre heater (iii) Bourden pressure gauge. (

Government Engineering College, Palanpur Mechanical Engineering Department  Basic Mechanical Engineering (3110006) Chapter: 1                                                                                                                          Introduction   Define : Prime Mover. Give types of prime movers. (03 Marks)   (Summer 2018)   Give the definition of   (1) close system (2) open system (3) isolated system (03) (Summer 2018,2016) (Winter 2018)   Define the heat and give the comparison of heat and work. (04) (Summer 2017)   State Zeroth law of thermodynamics. (03) (Summer 2017) Chapter: 2                                                                                                                          Energy   Write a short note on “Global Warming and Ozone depletion”. (Summer 2018) (Winter 2017)   Write a short note on  ”Solar Energy”. (04) (Summer 2016) Write a short note on  ”Solar Water Heater”. (03)  (Winter 2016)  What is solid fu