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

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)

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 instar 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 Hzsupply 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)