Power System Analysis MCQs Quizlet (Bank of Solved Questions Answers)

1. : For absolute stability of the system we use which criteria?
(A) Half set
(B) Transient area
(C) Equal area
(D) None of these

2. : The value of the zero sequence impedance is —
(A) Z₀ = 0
(B) Z₀ = Z + 3Zn
(C) Z₀ = Z + 2Zn
(D) Z₀ = Z

3. : In transmission line, corona loss is dependent on —
(A) Material of the conductor
(B) Diameter of the conductor
(C) Length of conductor
(D) Height of the conductor

4. : Bundled conductors are used to reduce —
(A) Increase electric stress
(B) Surface electric stress
(C) Decrease capacitance
(D) None of these

5. : Z-bus matrix is normally named as —
(A) Half matrix
(B) Unit matrix
(C) Full matrix
(D) None of these

6. : Corona occurs between two transmission lines when they —
(A) Carry DC power
(B) Have high potential difference
(C) Carry small current
(D) None of these

7. : In which of the following connections, zero sequence currents do not flow?
(A) Star
(B) Delta
(C) Sigma
(D) Mesh

8. : Earthing switch is used for —
(A) Charging residual energies
(B) Discharging residual energies
(C) Measuring energies
(D) None of these

9. : For medium transmission lines, which relays are used?
(A) Admittance relays
(B) Impedance relays
(C) Mho relays
(D) None of these

10. : What is corona?
(A) Partial breakdown of air
(B) Complete breakdown of air
(C) Sparking between lines
(D) None of these

11. : Capacitor start motor gives relatively high —
(A) Starting couple
(B) Starting torque
(C) Starting impedance
(D) None of these

12. : Why are hollow conductors used in transmission lines?
(A) Improve stability
(B) Reduce corona
(C) Increase corona
(D) All of these