EEL-4413-Power System Analysis 1- There are many assumptions which are required to be made to solve a load flow problem among the following is the main assumption to solve a load flow problem by Gauss-Seod m [2 Mark] All the buses are to be considered as PQ bus including the slack bus b- All the buses are to be considered as PV bus including the slack bus All the buses are to be considered as PQ bus excluding the slack bus d- All the buses are to be considered as PV bus excluding the slack bus. 2- Consider the following load-flow analysis problem, where the root is required to be found, The next iterative value of the root of x-4-0 using the Newton-Raphson method, if the initial guess is 3, would be: [2 Mark] -1.5 b- 2.067 2.167 d- 3.000 3- Newton-Raphson method is always used to treat power flow equations. Which type of equations are solved using the Newton Raphson method? [2 Mark] a- Non linear differential equations b- Linear differential equations -Non linear algebraic equations d- Both (a) and (b) e- All of these 4- What is the main drawback in Newton Raphson method? [2 Mark] - Slow to converge b- A large memory allocation is required to store the Jacobian matrix c- The number of iterations is more d- All of these e-e. None of these 5- What are the sequence impedances for a power transformer? [2 Mark] - Positive sequence impedance is more than the negative sequence and zero sequence Impedances. b- Positive, negative and zero sequence impedances are all equal. c- Positive and negative sequence impedances are equal. d- Positive sequence impedance is less than the negative sequence impedance 6- Consider a situation of line-to-line fault. What will be the sum of (l+1) in case of line-to-line fault, if the fault is occurring in the B and Y lines? [2 Mark] 8- ∞ b- 1 C-0 d- la 7- For a line-to-line fault analysis using symmetrical components: [2 Mark] a- The positive and negative sequence networks at the fault point are connected in series b- The positive, negative, and zero sequence networks at the fault point are connected in parallel c. The positive and negative sequence networks at the fault point are connected in parallel d- None of the above 8- The most frequently occurring faults in power systems are: [2 Mark) a- Single-line to ground fault. b- Double-line to ground fault. c-Line to line faults. d- Three-phase faults. e- All of the above 9- For a star connected three-phase load with a neutral impedance, Z, the per-phase zero sequence impedance of the load will be: [2 Mark] Dr. Maris Mald 2 of 10