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UNIVERSITY OF ABUJA FACULTY OF ENGINEERING DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING SECOND SEMESTER EXAMINATION 2021/2022 SESSION COURSE TITLE: COURSE CODE: TIME ALLOWED: 2 HRS, BASIC ELECTRICAL ENGINEERING II EEE 229 INSTRUCTIONS: Answer Any 4 Question Question 1 a. For a source-free RC circuit, prove that v(t) = voet/RC (15 Marks) b. In figure below let vc(0)=15 v. Find vc, vx, and ix for t>0. (10 Marks) 12 www 5 Ω 0.1 F +1 12 Ω Question 2 a. List four parameters that are used to model ideal transformer to approximate equivalent circuit. (6 Marks) b. A 5 kVA, 200/400 V, 50 Hz single phase transformer gave the following test results. Open-circuit test performed on the low voltage side: 200 V, 0.7 A, and 60 W. Short-circuit test performed on the high voltage side: 22 V, 16 A, and 120 W. Calculate the equivalent parameters of the transformer. (19 Marks) Question 3 (5 Marks) (5 Marks) a. What is an ideal transformer and its transformation ratio? b. Explain why transformers are rated in volt-amperes c. The core of a three phase, 50 Hz, 11000/550 V delta/star, 300 kVA, core-type transformer operates with a flux of 0.05 Wb. Find (i) number of H.V and L.V turns per phase, (ii) e.m.f per turn (iii) full load H.V and L.V turns per phase. (15 Marks) Question 4 a. Define the following terms: Initiation transients, Subsidence transient, transient, and Complex transient. b. Transition (12 Marks) A 50-Hz sinusoidal voltage of maximum value of 400 volt is applied to a series circuit of resistance 10 Ohms and inductance 0.1 Henry. Find an expression for the value of the current at any instant after the voltage is applied, assuming that voltage is zero at the instant of application. Calculate its value 0.02 second after switching on.(13 Marks)

UNIVERSITY OF ABUJA FACULTY OF ENGINEERING DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING SECOND SEMESTER EXAMINATION 2021/2022 SESSION COURSE TITLE: COURSE CODE: TIME ALLOWED: 2 HRS, BASIC ELECTRICAL ENGINEERING II EEE 229 INSTRUCTIONS: Answer Any 4 Question Question 1 a. For a source-free RC circuit, prove that v(t) = voet/RC (15 Marks) b. In figure below let vc(0)=15 v. Find vc, vx, and ix for t>0. (10 Marks) 12 www 5 Ω 0.1 F +1 12 Ω Question 2 a. List four parameters that are used to model ideal transformer to approximate equivalent circuit. (6 Marks) b. A 5 kVA, 200/400 V, 50 Hz single phase transformer gave the following test results. Open-circuit test performed on the low voltage side: 200 V, 0.7 A, and 60 W. Short-circuit test performed on the high voltage side: 22 V, 16 A, and 120 W. Calculate the equivalent parameters of the transformer. (19 Marks) Question 3 (5 Marks) (5 Marks) a. What is an ideal transformer and its transformation ratio? b. Explain why transformers are rated in volt-amperes c. The core of a three phase, 50 Hz, 11000/550 V delta/star, 300 kVA, core-type transformer operates with a flux of 0.05 Wb. Find (i) number of H.V and L.V turns per phase, (ii) e.m.f per turn (iii) full load H.V and L.V turns per phase. (15 Marks) Question 4 a. Define the following terms: Initiation transients, Subsidence transient, transient, and Complex transient. b. Transition (12 Marks) A 50-Hz sinusoidal voltage of maximum value of 400 volt is applied to a series circuit of resistance 10 Ohms and inductance 0.1 Henry. Find an expression for the value of the current at any instant after the voltage is applied, assuming that voltage is zero at the instant of application. Calculate its value 0.02 second after switching on.(13 Marks)

Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter29: Dc Generators
Section: Chapter Questions
Problem 15RQ: Explain the difference between cumulative- and differential-compounded connections.
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UNIVERSITY OF ABUJA FACULTY OF ENGINEERING DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING SECOND SEMESTER EXAMINATION 2021/2022 SESSION COURSE TITLE: COURSE CODE: TIME ALLOWED: 2 HRS, BASIC ELECTRICAL ENGINEERING II EEE 229 INSTRUCTIONS: Answer Any 4 Question Question 1 a. For a source-free RC circuit, prove that v(t) = voet/RC (15 Marks) b. In figure below let vc(0)=15 v. Find vc, vx, and ix for t>0. (10 Marks) 12 www 5 Ω 0.1 F +1 12 Ω Question 2 a. List four parameters that are used to model ideal transformer to approximate equivalent circuit. (6 Marks) b. A 5 kVA, 200/400 V, 50 Hz single phase transformer gave the following test results. Open-circuit test performed on the low voltage side: 200 V, 0.7 A, and 60 W. Short-circuit test performed on the high voltage side: 22 V, 16 A, and 120 W. Calculate the equivalent parameters of the transformer. (19 Marks) Question 3 (5 Marks) (5 Marks) a. What is an ideal transformer and its transformation ratio? b. Explain why transformers are rated in volt-amperes c. The core of a three phase, 50 Hz, 11000/550 V delta/star, 300 kVA, core-type transformer operates with a flux of 0.05 Wb. Find (i) number of H.V and L.V turns per phase, (ii) e.m.f per turn (iii) full load H.V and L.V turns per phase. (15 Marks) Question 4 a. Define the following terms: Initiation transients, Subsidence transient, transient, and Complex transient. b. Transition (12 Marks) A 50-Hz sinusoidal voltage of maximum value of 400 volt is applied to a series circuit of resistance 10 Ohms and inductance 0.1 Henry. Find an expression for the value of the current at any instant after the voltage is applied, assuming that voltage is zero at the instant of application. Calculate its value 0.02 second after switching on.(13 Marks)
Transcribed Image Text:UNIVERSITY OF ABUJA FACULTY OF ENGINEERING DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING SECOND SEMESTER EXAMINATION 2021/2022 SESSION COURSE TITLE: COURSE CODE: TIME ALLOWED: 2 HRS, BASIC ELECTRICAL ENGINEERING II EEE 229 INSTRUCTIONS: Answer Any 4 Question Question 1 a. For a source-free RC circuit, prove that v(t) = voet/RC (15 Marks) b. In figure below let vc(0)=15 v. Find vc, vx, and ix for t>0. (10 Marks) 12 www 5 Ω 0.1 F +1 12 Ω Question 2 a. List four parameters that are used to model ideal transformer to approximate equivalent circuit. (6 Marks) b. A 5 kVA, 200/400 V, 50 Hz single phase transformer gave the following test results. Open-circuit test performed on the low voltage side: 200 V, 0.7 A, and 60 W. Short-circuit test performed on the high voltage side: 22 V, 16 A, and 120 W. Calculate the equivalent parameters of the transformer. (19 Marks) Question 3 (5 Marks) (5 Marks) a. What is an ideal transformer and its transformation ratio? b. Explain why transformers are rated in volt-amperes c. The core of a three phase, 50 Hz, 11000/550 V delta/star, 300 kVA, core-type transformer operates with a flux of 0.05 Wb. Find (i) number of H.V and L.V turns per phase, (ii) e.m.f per turn (iii) full load H.V and L.V turns per phase. (15 Marks) Question 4 a. Define the following terms: Initiation transients, Subsidence transient, transient, and Complex transient. b. Transition (12 Marks) A 50-Hz sinusoidal voltage of maximum value of 400 volt is applied to a series circuit of resistance 10 Ohms and inductance 0.1 Henry. Find an expression for the value of the current at any instant after the voltage is applied, assuming that voltage is zero at the instant of application. Calculate its value 0.02 second after switching on.(13 Marks)
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