1. Power system analysis is primarily concerned with:
(A) Electrical safety
(B) System planning, operation, and control
(C) Circuit design
(D) Equipment testing
2. The three basic components of a power system are:
(A) Generator, Transformer, Load
(B) Generation, Transmission, Distribution
(C) Transformer, Feeder, Load
(D) Transmission, Distribution, Substation
3. The main purpose of power flow analysis is to determine:
(A) Current direction only
(B) Voltage magnitude and phase angle at each bus
(C) Resistance of each line
(D) Insulation level
4. The common method used for load flow studies is:
(A) Kirchhoff’s Law
(B) Gauss-Seidel method
(C) Laplace Transform
(D) Millman’s Theorem
5. In power system analysis, a bus represents:
(A) A single line
(B) A junction of several elements
(C) A single transformer
(D) A load only
6. The bus where both magnitude and phase angle of voltage are specified is called:
(A) Slack bus
(B) PV bus
(C) PQ bus
(D) Reference bus
7. The bus where voltage magnitude and real power are specified is known as:
(A) PQ bus
(B) Slack bus
(C) PV bus
(D) Load bus
8. The bus where both active and reactive power are specified is called:
(A) PQ bus
(B) PV bus
(C) Slack bus
(D) Reference bus
9. The main objective of short-circuit analysis is to:
(A) Improve efficiency
(B) Determine fault currents
(C) Reduce system losses
(D) Calculate load demand
10. The symmetrical components method is used for:
(A) Three-phase fault analysis
(B) Unbalanced fault analysis
(C) Load flow calculation
(D) Power factor correction
11. A symmetrical fault in a power system involves:
(A) All three phases equally
(B) Only one phase
(C) Two phases
(D) Ground only
12. The most severe type of fault in a power system is:
(A) Line-to-ground fault
(B) Line-to-line fault
(C) Three-phase fault
(D) Double line-to-ground fault
13. The per-unit system is used in power system analysis to:
(A) Complicate calculations
(B) Simplify calculations by normalizing quantities
(C) Eliminate line losses
(D) Increase power factor
14. The base quantities selected in per-unit calculations are:
(A) Voltage and Current
(B) Voltage and Power
(C) Current and Resistance
(D) Power and Resistance
15. The reactance of transmission lines is generally expressed in:
(A) Ohms per meter
(B) Per-unit or percent form
(C) Volts per ampere
(D) Watts
16. The main objective of load flow study is to:
(A) Determine line currents and bus voltages
(B) Determine insulation level
(C) Design substation layout
(D) Measure harmonics
17. The Newton-Raphson method for load flow is preferred because it:
(A) Converges faster
(B) Is slower but simpler
(C) Needs no iteration
(D) Is less accurate
18. The single-line diagram represents:
(A) Only one phase of a three-phase system
(B) A DC system
(C) Detailed wiring
(D) Control circuit
19. The impedance diagram is used to represent:
(A) Only resistances
(B) Only reactances
(C) The simplified equivalent circuit of a power system
(D) Control relays
20. During a fault, the system voltage:
(A) Increases sharply
(B) Decreases significantly
(C) Remains constant
(D) Becomes zero instantly
21. Power system stability refers to:
(A) Ability to remain in synchronism after a disturbance
(B) Ability to reduce losses
(C) Capacity to transmit maximum power
(D) Frequency regulation
22. Transient stability deals with:
(A) Small disturbances
(B) Large disturbances
(C) Steady-state operation
(D) Frequency variation only
23. Steady-state stability refers to:
(A) Sudden large disturbances
(B) Continuous small disturbances
(C) Fault clearing time
(D) Synchronizing torque
24. The equal area criterion is used for:
(A) Fault current analysis
(B) Transient stability analysis
(C) Load flow
(D) Voltage regulation
25. The swing equation is used to study:
(A) Voltage control
(B) Frequency control
(C) Rotor dynamics during disturbances
(D) Line impedance
26. The power factor of a power system can be improved by using:
(A) Inductive loads
(B) Capacitors or synchronous condensers
(C) Transformers
(D) Transmission lines
27. Load dispatch centers are responsible for:
(A) Designing transformers
(B) Maintaining power balance between generation and load
(C) Installing equipment
(D) Building substations
28. Fault level at a bus depends on:
(A) System impedance and voltage
(B) Frequency only
(C) Load current
(D) Power factor
29. The steady-state stability limit is the:
(A) Maximum power that can be transferred without losing synchronism
(B) Minimum load demand
(C) Maximum fault current
(D) Minimum voltage level
30. The main aim of power system analysis is to:
(A) Ensure reliable and economical operation
(B) Increase system losses
(C) Reduce generation
(D) Simplify equipment design only