Electrical Engineering MCQ Question Papers: Campus Placement

Subject: Power System Operations and Control 1

**Part 1: List for questions and answers of Power System Operations and Control**

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**Q1.How is the voltage and frequency controlled in automatic generation control?**

**a) By controlling the excitation**

**b) By controlling the turbine action**

**c) Turbine speed control for voltage and excitation control for frequency**

**d) Excitation control for voltage and turbine speed control for voltage**

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**Q2. What is the unit of transmission loss coefficient?**

**a) MW**

**b) (MW)^-1**

**c) Unit less**

**d) (MW)^2**

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**Q3. What will be the penalty factor for a unit, if the generating station is located very close ****to load centre?**

**a) Zero**

**b) Almost equal to unity**

**c) The penalty factor is negative**

**d) The value is very high**

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**Q4. With the use of high speed circuit breakers, which among the following stability is ****increased?**

**a) Steady state stability**

**b) Transient stability**

**c) Frequency stability**

**d) All of these**

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**Q5. Which among these is related to the critical clearing time of a fault in a power system?**

**a) Transient stability limit**

**b) Steady state stability limit**

**c) Frequency limit**

**d) All of these**

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**Q6. Which among these cannot be determined from equal area criterion?**

**a) Critical clearing angle**

**b) Critical clearing time**

**c) Transient stability limit**

**d) Both (a) and (b) **

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**Q7. What are the common assumptions made for the equal area criterion?**

**a) The transmission line and machine resistances are neglected**

**b) Rotor speed of the machine is constant**

**c) Mechanical input remains constant**

**d) All of these**

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**Q8. For which among the following cases is the equal area criterion of stability used?**

**a) One machine and infinite bus bar**

**b) No load on bus bar**

**c) Many machines and infinite bus bar**

**d) All of these**

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**Q9. Which stability information is obtained from the equal area criterion?**

**a) Absolute stability**

**b) Transient stability**

**c) Steady state stability**

**d) Both (b) and (c)**

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**Q10.Why are the series capacitors used?**

**a) Improve the voltage**

**b) Reduce the fault level**

**c) Compensate for line inductive reactance and improve the stability of the power ****system**

**d) Improves the power factor**

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**Q11. Which among the following methods are used to improve steady state stability?**

**a) Reducing the reactance between the transmission and receiving points**

**b) By using bundled conductors**

**c) By increasing the excitation of generator or motor or both**

**d) All of these**

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**Q12. At what value of ‘d’ the maximum power transfer takes place?**

**a) 45 °**

**b) 90 °**

**c) 120 °**

**d) 180 ° **

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**Q13. What will be the inertia constant H, for a water wheel generator having a speed less ****than 200 rpm?**

**a) 2 – 4**

**b) 2 – 3**

**c) 1 – 2**

**d) 5 – 6**

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**Q14. What are the main applications of the swing curves?**

**a) Designing the rotor field windings**

**b) Designing the protective devices**

**c) Used to limit the size of the machine**

**d) All of these**

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**Q15. What information does the swing curve provide?**

**a) Stability of the system**

**b) Performance of the machine**

**c) The rotor performance**

**d) All of these**

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**Q16. What kind of differential equation is swing equation?**

**a) Linear second order**

**b) Non linear first order**

**c) Linear first order**

**d) Non linear second order**

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**Q17. What is / are the major assumptions made in the calculation of swing equations?**

**a) Damper windings are neglected**

**b) The machine is lossless**

**c) The machine has to run at synchronous speed**

**d) Both (a) and (b)**

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**Q18.For economic measure the generators at a power plant operate at ________**

**a) Equal incremental cost**

**b) Equal loads**

**c) Equal power rating**

**d) All of these **

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**Q19. Which among the following factors influence the cost of generation of electric power?**

**a) Generator efficiency**

**b) Fuel cost**

**c) Transmission losses**

**d) All of these**

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**Q20. Which among the following methods are highly accurate?**

**a) Gauss Seidel method**

**b) Newton Raphson method**

**c) Fast decoupled low flow method**

**d) All of these **

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**Part 1: List for questions and answers of Power System Operations and Control**

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**Q1. Answer: c**

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**Q2. Answer: b**

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**Q3. Answer: b**

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**Q4. Answer: b**

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**Q5. Answer: a**

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**Q6. Answer: b**

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**Q7. Answer: d**

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**Q8. Answer: a**

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**Q9. Answer: a**

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**Q10. Answer: c**

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**Q11. Answer: d**

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**Q12. Answer: b**

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**Q13. Answer: b**

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**Q14. Answer: a**

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**Q15. Answer: a**

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**Q16. Answer: d**

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**Q17. Answer: d**

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**Q18. Answer: a**

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**Q19. Answer: d**

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**Q20. Answer: b**