Birla Institute of Technology & Science, Pilani Work-Integrated Learning Programmes Division First Semester 2010-2011 Mid-Semester Test (EC-1 Regular) Course No. : ENGG ZC111 Course Title : ELECTRICAL & ELECTRONICS TECHNOLOGY Nature of Exam : Closed Book Weightage : 40% Duration : 2 Hours Date of Exam : 29/08/2010 (AN) Note: 1. Please follow all the Instructions to Candidates given on the cover page of the answer book. 2. All parts of a question should be answered consecutively. Each answer should start from a fresh page. 3. Mobile phones and computers of any kind should not be used inside the examination hall. 4. Use of any unfair means will result in severe disciplinary action. Q.1. Find the voltage across the 4Ω resistor in the network shown in Fig. Q.1 using (a) Nodal analysis (b) The superposition theorem (c) Thevenin’s theorem [15] Figure Q.1 Q.2. The power dissipation across and the current in a circuit are represented by (100+j200) V and (10+j5) A respectively. Calculate the active power and the reactive power. [4] Q.3. A parallel network consists of branches A, B and C. If I A =10 -60 o A, I B =5 -30 o A, and I C =10 90 o A, all phase angles, being relative to the supply voltage, determine the total supply current. [7] No. of Pages = 1 2V 2A