Question

Ture or False questions, please provide explantions.

Q4.5 In per unit system, all the formulas are devoid of the factor \3. Q4.6 When adequate information is lacking, it is not unreasonable to take 400 ohms as the surge impedance of a 132 kV transmission line. Q4.7 When a power system suddenly loses some generation, the frequency goes down Q4.8 In ABCD parameters of transmission lines, A-D for any type of modelling Q4.9 In ABCD parameters of transmission lines, AD-BC-0 for any type of modelling Q4.10 in a transmission line, the reactive power flow depends on the voltage difference between the two ends of the line. Q4.11 In power system operation, steady-state means a situation when there is no change in load. Q4.12 Single line faults are most frequent and severe. Q4.13 The unit of moment of inertia is kg/m Q4.14 The difference between a circuit breaker and an isolator is that while a circuit breaker can interrupt large fault currents, the isolator can only interrupt load current. Q4.15 Under-frequency relays are used to improve the falling frequency of a system to some extent.

Answer 1

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