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Q1. All Choose the correct answer: 1. One of the advantage of using a per unit system in power system calculations is: a) To increase the accuracy of the results b) no computation are required to refer an impedance from one side of a transfo c) The per unit impedances of machines of the same type and widely different rating usually lie within a wide range. 2. The load is modelled in fault calculation of a power system by: a) A constant impedance b) An EMF in series with an impedance c) A constant impedance for a static load and an EMF in series with an impedance for rotating machines 3. The most famous fault in a power system is a) Symmetrical three phase fault b) Single line to ground fault c) Line to line fault (1) (2)

Q1. All Choose the correct answer: 1. One of the advantage of using a per unit system in power system calculations is: a) To increase the accuracy of the results b) no computation are required to refer an impedance from one side of a transfo c) The per unit impedances of machines of the same type and widely different rating usually lie within a wide range. 2. The load is modelled in fault calculation of a power system by: a) A constant impedance b) An EMF in series with an impedance c) A constant impedance for a static load and an EMF in series with an impedance for rotating machines 3. The most famous fault in a power system is a) Symmetrical three phase fault b) Single line to ground fault c) Line to line fault (1) (2)

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Q1. All Choose the correct answer: 1. One of the advantage of using a per unit system in power system calculations is: a) To increase the accuracy of the results b) no computation are required to refer an impedance from one side of a transfo c) The per unit impedances of machines of the same type and widely different rating usually lie within a wide range. 2. The load is modelled in fault calculation of a power system by: a) A constant impedance b) An EMF in series with an impedance c) A constant impedance for a static load and an EMF in series with an impedance for rotating machines 3. The most famous fault in a power system is a) Symmetrical three phase fault b) Single line to ground fault c) Line to line fault 4. The type of unsymmetrical faults at which the sequence currents are equal( i.e I = 1 = 19) is: (1) (2) a) Double line to ground fault b) Line to line fault c) Single line to ground fault 5. The ohmic reactance of a 0.1 pu, 30 kVA, 240/480 V single phase transformer referred to the low voltage side is: a) 0.768 2 b) 6.25 2 c) 0.192 2
Transcribed Image Text:Q1. All Choose the correct answer: 1. One of the advantage of using a per unit system in power system calculations is: a) To increase the accuracy of the results b) no computation are required to refer an impedance from one side of a transfo c) The per unit impedances of machines of the same type and widely different rating usually lie within a wide range. 2. The load is modelled in fault calculation of a power system by: a) A constant impedance b) An EMF in series with an impedance c) A constant impedance for a static load and an EMF in series with an impedance for rotating machines 3. The most famous fault in a power system is a) Symmetrical three phase fault b) Single line to ground fault c) Line to line fault 4. The type of unsymmetrical faults at which the sequence currents are equal( i.e I = 1 = 19) is: (1) (2) a) Double line to ground fault b) Line to line fault c) Single line to ground fault 5. The ohmic reactance of a 0.1 pu, 30 kVA, 240/480 V single phase transformer referred to the low voltage side is: a) 0.768 2 b) 6.25 2 c) 0.192 2
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