CL wadhwa bits solutions (72 - 77)

Lesson 13 of 21 • 34 upvotes • 9:24mins

Anvesh Sameer

72. The load flow solution is always assured in case of: (a) Newton-Raphson method (b) Gauss method (c) Gauss-Seidel method (d) None of these methods guarantees. 73. If α is the angle of voltage wave at which an R-L circuit is switched in and θ is the impedance angle of the R-L circuit, there will be no transient when the circuit is switched in, if: (a) α = θ (b) α = 90 – θ (c) α = 90 + θ (d) None of the above.
     74. At a particular unbalanced node, the real powers specified are: Leaving the node 20 MW, 25 MW Entering the node 60 MW, 30 MW The balancing power will be: (a) 30 MW leaving the node (b) 45 MW leaving the node (c) 45 MW entering the node (d) 22.5 MW entering the node and 22.5 MW leaving the node. 75. The loss coefficients for a two-bus system are given as follows: (a) B11 = 0.02, B22 = 0.05, B12 = 0.01, B21 = 0.015. (b) B11 = 0.02, B22 = 0.04, B12 = – 0.01, B21 = 0.001. (c) B11 = 0.03, B22 = 0.005, B12 = – 0.001, B21 = – 0.001. (d) B11 = 0.03, B22 = 0.05, B12 = 0.001, B21 = – 0.001. 76. For economic operation, the generator with highest positive incremental transmission loss will operate at: (a) The lowest positive incremental cost of production (b) The lowest negative incremental cost of production (c) The highest positive incremental cost of production (d) None of the above. 77. The inertia constant H of a machine of 200 MVA is 2 p.u. its value corresponding to 400 MVA will be: (a) 4.0 (b) 2.0 (c) 1.0 (d) 0.5.