Basic Electrical and Electronics Engineering 2nd MJ13

Reg.No. : Question Paper Code : 21467 B.E./B.Tech. DEGREE EXAMINATION , MAY/JUNE 2013. Second Semester Civil Engineering GE 2151/EE 26/EE 1153/10133 EE 206/080280011 – BASIC ELECTRICAL AND ELECTRONICS ENGINEERING (Regulation 2008/2010) (Common to Aeronautical , Automobile , Marine , Mechanical , Production , Chemical , Petroleum Engineering Biotechnology , Polymer , Textile , Textile (Fashion) , Plastic technology , Environmental Engineering , Geoinformatics Engineering , Industrial Engineering , Industrial Engineering and Management , Manufacturing Engineering , Material Science and Engineering , Mechanical and Automation Engineering , Mechatronics Engineering , Petrochemical Engineering , Chemical and Electrochemical Engineering , Petrochemical Technology , Pharmaceutical Technology and Textile Chemistry) Other Departments Papers: Click Here Download PDF File - Click Here PART A – (10 X 2 = 20 marks) 1. A 120 resistor has a specified maximum power dissipation of 1 W. Calculate the maximum current level. 2. Three inductive coils each with resistance of 15 and an inductance of 0.03 H are connected in star to a 3Ö 400 V, 50 Hz supply. Calculate the phase voltages. 3. A dc shunt generator supplies a load of 10 kW at 220 V through feeders of resistance 0.1. The resistance of armature and shunt field windings is 0.05 and 100 respectively. Calculate the terminal voltage. 4. In a single phase transformer, Np = 350 turns, Ns = 1050 turns, Ep = 400V. Find Es. 5. Write any two salient points on a p-n junction. 6. When should a transistor be biased? Name two common biasing circuits. 7. Find the following binary difference: 1011010 – 0101110 8. An active high S-R latch has a 'l' on S-input and 'o' on the 'R' input. What state is the latch in? 9. As related to amplitude modulation, what is over-modulation, undermodulation and 100% modulation? 10. Why are digital signals said to be noise immune? PART B – (5 X 16 = 80 marks) 11. (a) (i) (1) State and explain Kirchoff's laws. (4) (2) A Sinusoidal current wave is given by i = 50sin(100Ðt). Determine the root mean square value. (4) (ii) Write short notes on moving Iron Measuring Instruments under the Following headings : (1) Operating principle. (4) (2) Classification. (2) (3) Advantages and disadvantages. (2) Or (b) (i) 3 Ö, 200 kW,50 Hz delta connected induction motor is supplied from a 3Ö 440 V, 50 Hz supply system. The efficiency and power factor of 3Ö induction motor are 91% and 0.86 respectively. Calculate : (1) (A) Current in each motor phase. (2) (B) Line current (2) (2) Phasor diagram of the circuit (4) (ii) Find the current in the 8 resistor in the following circuit using Kirchoff's Law. (8)

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