Rr210102-machanical And Electrical Sciences

RR

Code No: RR210102 II B.Tech. I Semester(RR) Supplementary Examinations, May 2009 MECHANICAL & ELECTRICAL SCIENCE (Civil Engineering)

Time: 3 hours

Max Marks: 80 Answer any FIVE questions All questions carry equal marks ?????

1. (a) Illustrate the constructional details of an I.C. engine? Explain briefly about important components. (b) With neat sketches, explain the working principle of 4-stroke S.I. engine. 2. (a) Explain the principle of operation of gas welding with neat sketch. (b) Explain the equipments and materials used for arc cutting. 3. (a) Explain with a neat sketch, the working principle of standard shaper. (b) Explain the different types of bull dozers with suitable applications. 4. (a) Describe with a neat sketch the working of vapour compression refrigeration system. (b) Briefly explain the principle of operation of a milling machine. 5. (a) Derive the emf equation of DC Generator. (b) Determine the value of torque in N-m established by a machine of a 4-pole motor having 750 conductors, two paths in parallel, 20mW b per pole when the total armature current is 60 amperes. 6. (a) Explain the principle and operation of single phase transformer. (b) A transformer with 800 primary turns and 200 secondary turns is supplied from a 100V AC supply. Calculate the secondary voltage. 7. (a) Explain the principle of operation of alternatives. (b) Explain the slip torque characteristics of 3 − φ induction motor. 8. Explain the construction and working principle of permanent magnet moving coil instruments. ?????