AE401,ME401,DAE19,DME19 IV SEMESTER DIPLOMA EXAMINATION, JANUARY-2013 THERMODYNAMICS Time: 3 Hours Max. Marks: 75 GROUP A : Answer any three questions. (Question No. 1 is compulsory) Q.1 Write a short note on Otto cycle. (05) Q.2. With neat sketch explain steam boiler plant. (10) Q.3 Write a short note on H-S Chart or Mollier diagram. (10) Q.4 State and explain First Law of Thermodynamics. (10) Q.5. Explain with neat sketch working principle of air compressor. (10) GROUP B : Answer any three questions. (Question No. 6 is compulsory) Q.6 Explain briefly: Internal Combustion Engines. (05) Q.7 Compare Otto, Diesel and Dual Combustion cycle. (10) Q.8 Explain the different application of Compressed air in industries. (10) Q.9 What the various Lubrication systems used in I.C. Engines. (10) Q.10 How the Brake Power in I.C. Engines is calculated? (10) GROUP C: All Questions are Compulsory. Q.11 Fill in the blanks. (Each question carries 2 marks) (iii) The superheating of stream at may be regarded as hyperbolic. First law of thermodynamics deal with. The speed of rotary compressor is as compared to reciprocating air compressor. For the same compression ratio, the efficiency of diesel cycle is Otto cycle. The enthalpy of dry saturated steam with the increase in pressure. Q.12 Multiple choice question. (Each question carries 2 marks) (iii) Which of the following statement is correct as regard to centrifugal compressors? (a) Closed system (b) Open system (c) Isolated system (d) none Carnot cycle consists of. (a) Two constant volume and two reversible adiabatic processes (b) Two isothermal and two reversible adiabatic processes (c) Two constant pressure and two reversible adiabatic processes (d) One constant volume, one constant pressure and two reversible adiabatic processes Atmospheric pressure. (a) 1.013 bar (b) 1.01.3 kn/m 2 (c) 760 mm of H g (d) all of these
A compressor mostly used for supercharging of I.C. Engine is. (a) Radial flow compressor (b) Axial flow (c) Roots blower (d) Reciprocating compressor Second law of thermodynamic defines. (a) Heat (b) Entropy (c) Work (d) Internal Energy Q.13 True or false (Each question carries 1 marks) Water at standard atmospheric conditions is far below its critical state. The efficiency of Erricson cycle is greater than carnot cycle. (iii) The thermal efficiency of a two stroke engine is less than four stroke engine. Total power developed by combustion of fuel in combustion chamber is called Brake Power. Roots blower compressor is a positive displacement compressor. ******
AE402,ME402,DAE20,DME20 IV Semester DIPLOMA Examination, January 2013 MANUFACTURING TECHNOLOGY II Time: 3 Hours Max. Marks: 75 GROUP A : Answer any three questions. (Question No. 1 is compulsory) Q.1 Explain Planner and types of Planner Machine. (05) Q.2 With neat sketch explain radial drilling machine. Q.3 What are the methods to support the punches? (10) Q.4 Differentiate between a) Drilling and boring b) Counter sinking and counter boring (10) Q.5 Breifly classify different types of grinding machines? (10) GROUP B : Answer any three questions. (Question No. 6 is compulsory) Q.6 What are the principles of Jigs and Fixtures? (05) Q.7 Sketch and explain centre less grinders. (10) Q.8 What is the power devices used for clamping? (10) Q.9 Describe gear manufacturing in shaping operation. (10) Q.10 Explain principle for drilling jigs. (10) GROUP C: All Questions are Compulsory. Q.11 Fill in the blanks. (Each question carries 2 marks) (iii) Shaper is primarily designed to generate surfaces. Rather than mechanical, controls are preferred on a grinding machine to reduce vibrations. Size of a broaching machine is specified by the stroke length and. When the locating elements cannot restrain the work piece is used. type of indexing cannot be used for helical gear milling. Q.12 Multiple choice question. (Each question carries 2 marks) In a pull broach tool is entirely in. (a) Tension (b) Compression (c) Shear (d) Bending The relation between cutting time and return time is. (a) Cutting time X return time (b) Cutting time / return time (c) Cutting time + return time (d) Cutting time - return time P. T. O
(iii) In a slotter which movement of table is not possible? (a) Longitudinal (b) Cross (c) Circular (d) Reciprocating Which belt is used in Sensitive Drilling Machine? (a) Flat (b) Round (c) V (d) Ribbed Which is the 4th movement provided to Universal milling machine as compare to plane milling machine? (a) Longitudinal (b) Cross (c) Circular (d) Swiveled Horizontally Q.13 True or false (Each question carries 1 marks) Gleason method employs a single milling cutter for gear manufacture. Jig boring machines are also used as measuring machines. (iii) Centre less grinding can be used only for external surfaces. Gear hobbing can produce internal gears. A shaper can produce contoured surfaces *****
ME403,DME21 IV SEMESTER DIPLOMA EXAMINATION, JANUARY-2013 ELECTRICAL AND ELECTRONICS ENGINEERING Time: 3 Hours Max. Marks: 75 GROUP A: Answer any three questions. (Question No. 1 is compulsory) Q.1 State the unit of Resistance and Current. (05) Q.2 Calculate the filament resistance in 100 Watts 230V lamp. (10) Q.3 What are the applications of DC Motors? (10) Q.4 Which test is used to find the Copper loss in the transformer? (10) Q.5 Difference between intrinsic semiconductor and extrinsic semiconductor. (10) GROUP B: Answer any three questions. (Question No. 6 is compulsory) Q.6 What is series and parallel connection? (05) Q.7 Explain with neat sketch DC generator working principle? (10) Q.8 Draw the V-I characteristics of SCR. (10) Q.9 Draw the input and output characteristics of CB configuration. (10) Q.10 Mention the types of ear thing. (10) GROUP C: All Questions are Compulsory. Q.11 Fill in the blanks (Each question carries 2 marks) (iii) The earthing connection is always done with. The SI unit of Specific Resistance is. A semiconductor when doped to have excess of electrons its crystalline structure is called semiconductor. When a small positive potential is applied to the junction J3 is forward biased and junction J2 is based. An auto transformer requires less Cu than a transformer of similar rating. Q.12 Multiple choice question. (Each question carries 2 marks) At same rating an auto transformer has smaller size than. (a) Single-winding transformer (b) Two-winding transformer (c) Both (d) None Single phase induction motor has. (a) Stator (b) Rotor (c) Both (d) None
(iii) Auxiliary winding has. (a) High resistance (b) Low resistance (c) Either a or b (d) None. With increase in secondary voltage, the Voltage regulation. (a) Increase (b) Decreases (c) Remains constant The test used to give copper loss of transformer is. (a) OC test (b) SC test (c) IC test Q.13 True or false (Each question carries 1 marks) The SI unit of specific resistance is ohm/meter. The generator converts electrical energy into mechanical energy. (iii) The rotational angle of motor is proportional to the input pulse. Permanent-magnet is the basic type of stepper motor. The atoms are arranged in orderly pattern are called crystal. ******
ME404, DME22 IV SEMESTER DIPLOMA EXAMINATION, JANUARY-2013 REFRIGERATION AND AIR CONDITIONING Time: 3 Hours Max. Marks: 75 GROUP A : Answer any three questions. (Question No. 1 is compulsory) Q.1 What are the different methods of refrigeration systems? (05) Q.2 explain briefly the properties of a good refrigerant. (10) Q.3 Sketch and explain Vapour Absorption refrigeration cycle. (10) Q.4 What do you mean by Electrolux Refrigerator? Explain in short. (10) Q.5 How will you select refrigerant? Give points of selection according to application. (10) GROUP B : Answer any three questions. (Question No. 6 is compulsory) Q.6 Explain briefly: Hermetically sealed Compressor with a neat sketch. (05) Q.7 Explain the role of Air-conditioning in Industries with examples. (10) Q.8 Explain following processes with the help of Psychometric Chart. Sensible heating and sensible cooling. Adiabatic heating and dehumidification. (iii) Adiabatic cooling and humidification. Cooling and dehumidification. (10) Q.9. Define the following terms: i) RSH ii) RLH iii) RTH iv)ershf v)erlhf vi)erthf (10) Q.10. Sketch and explain Centrifugal Compressor with its advantages and disadvantages. (10) GROUP C: All Questions are Compulsory. Q.11 Fill in the blanks (Each question carries 2 marks) Heat pump is defined as System operating in a cycle. Mass of the air bed from cooling turbine to be used for cooling. (iii) Shell and tube heat exchangers are used for temperature more than. The two types of unitary water coolers are type and type. A storage temperature of 0 C to is best to preserve the fresh foods. Q.12 Multiple choice question. (Each question carries 2 marks) The high temperature in a Vapour compression refrigeration system occurs after. (a) Compression (b) Condensation (c) Expansion
(iii) (d) Evaporation. The fluids used in the Electrolux refrigerator are. (a) Water and hydrogen (b) Hydrogen and Ammonia (c) Ammonia, water and Hydrogen (d) None of these. The freezing point of ammonia is. (a) -157 C (b) -78 C (c) -40.8 C (d) None of these. The chemical formula for the refrigerant number R-170 is. (a) C3 H3 (b) C2H6 (c) C4 H10 (d) C3 H6 In central air conditioning system, mass flow rate of air handled is m³/min. (a) 2000 (b) 3500 (c) 4000 (d) 6000 Q.13 True or false (Each question carries 1 marks) In SI units, 1 Ton of refrigeration = 12660 KJ/hr. In Vapor compression system working medium is air. (iii) In Cold Storage the expansion device is a capillary tube, Ton capacity and mass flow rate of Air in commercial a/c system very less. Ideal refrigerant should be flammable. ******
ME405/DME23-L IV SEMESTER DIPLOMA MECHANICAL ENGINEERING EXAMINATION JANUARY-2013 THERMODYNAMICS Time: 1 hours (5X5=25) I. ANSWER ALL QUESTIONS. 1. Thermal Engineering by R.K.Rajput, Lakshmi Publications Pvt Ltd, New Delhi 2. A course in refrigeration and air conditioning by Domkundwar 3. Principles of refrigeration by Dossat 4. Home refrigeration and air conditioning by Audels, Theo Audel & Co, NewYor 5. Refrigeration and air conditioning by C.P Arora
ME406/DME24-L IV SEMESTER DIPLOMA MECHANICAL ENGINEERING EXAMINATION JANUARY-2013 WORKSHOP LAB-II Time: 1 hours (5X5=25) I. ANSWER ALL QUESTIONS. 1. Introduction of safety in operating machines. 2. Introduction to lathe, drilling machine & shaping machine and its parts. 3. Introduction to work holding devices and tool holding devices. 4. Types of tools used in lathe work, drilling & shaping. 5. Types of measuring instruments and their uses.