Related MCQs

• A power system has two synchronous generators. The governor-turbine characteristics orresponding to the generators are <br>P₁ = 50(50 ), P₂ = 100(51 ). where f denotes the system frequency in Hz and P₁ and P₂ are respectively, the power outputs (in MW) of turbines 1 and 2. Assuming the generat or s and transmission network to be lossless, the system frequency for a total load of 400 MW is __________ Hz
• Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]. <b>Assertion:</b> Fast decoupled load flow method gives approximate load flow solution because it uses several assumptions. <br><b>Reason:</b> Accuracy depends on the power mismatch vector tolerance.
• The fuel cost functions of two powr plants are <br>Plant P₁ : C₁ = 0.05 Pg ₁ + APg₁ + B <br>Plant P₂ : C₂ = 0.10 Pg ₂ + APg₂ + 2B <br>Where, P_g1 and P_g2 are the generated powers of two plants, and A and B are the constants. If the two plants optimally share 1000 MW load at increamental fuel cost of 100 Rs/MWh, the ratio of load shared by plants P₁ and P₂ is
• If a 75 MVA, 10 kV synchronous generator has X_d = 0.4 p.u, then X_d value (in p.u.) to a base of 100 MVA, 11 kV is ___________
• In a long transmission line with r, l, g and c are the resistance, inductance, shunt conductance and capacitance per unit length, respectively, the condition for distortionless transmission is
• A cable has following characteristics: <br>L = 0.201 H/m and C = 196.2 p/F/m. <br>The velocity of wave propagation through the cable is ________ m/s
• When a line-to-ground fault occurs, the current in the phase is 100 A. The zero sequence current in this case will be _______ A
• A three phase 50 Hz line consists of three conductors each of diameter 21 mm. The spacing between the conductors as follows: A B = 3m, B C = 5m, C A = 3.6 m <br>If the line operates at 132 kV, the reactive voltampere generatd by the line per km is _______kVAr
• If the sheath resistance is 2.14 /km and that of the conduct or is 0.1625 /k m, and mutual inductance of the shealth is 3.13 10⁷ H/m. When the cable is 2 km long and supply is 50 Hz, the ratio of sheath loss to core loss of the cable will be_______
• A 50 Hz alternator is rated 500 MVA, 20 kV, with X_d = 1.0 per unit and X_"d = 0.2 per unit. It supplies a purely resistive load of 400 MW at 20 kV. The load is connected directly across the generator terminals when a symmetrical fault occurs at the load terminals. The initial rms current in the generator in per unit is __________