Exam: Electrical Fundamentals - Semester 1 (ELEC 6007) at Cork Institute of Technology, Exams of Electrical Engineering

Download Exam: Electrical Fundamentals - Semester 1 (ELEC 6007) at Cork Institute of Technology and more Exams Electrical Engineering in PDF only on Docsity! - 1 - ELEC 6007 CORK INSTITUTE OF TECHNOLOGY INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ Semester 3 Examinations 2007/08 Module Title: Electrical Fundamentals – Semester 1 Module Code: ELEC 6007 School: Electrical & Electronic Engineering Programme Title: Bachelor of Engineering in Electrical Engineering - Year 1 Programme Code: EELEC_7_Y1 External Examiner(s): Mr. M. Hennessy Prof. E. McQuade Internal Examiner(s): Mr. R. Daly Mr. N. Mulcahy Instructions: Answer FOUR questions. All formula for calculations must be shown. Use a seperate answer book for each section. Duration: 2 Hours Sitting: Autumn 2008 Requirements for this examination: N/A Note to Candidates: Please check the Programme Title and the Module Title to ensure that you are attempting the correct examination paper. If in doubt please contact an Invigilator. - 2 - ELEC 6007 Section A - Please use answer book A! Q1. (a) A capacitor consists of two metal plates, each having an area of 600 cm2, separated by a dielectric 4 mm thick which has a relative permittivity of 6. Calculate the capacitance of the capacitor. – Note the permittivity of free space is 8.854 x 10-12 F. (9 marks) (b) When the capacitor is connected to a 100 V d.c. supply, calculate: (i) the charge stored in the capacitor (ii) the electric field strength (iii) the displacement (iv) the energy stored in the capacitor. (16 marks) Q2. State Kirchhoff's Laws and apply them to the solution of the following problem. Two batteries, A and B, are connected in parallel, and a 3 Ω resistor is connected across the battery terminals. The e.m.f. and the internal resistance of battery A are 42 V and 2Ω respectively, and the corresponding values for battery B are 32 V and 0.5 Ω respectively. Calculate: (a) the value and direction of the current in each battery (b) the terminal voltage. (25 marks)