Electrical Engineering MCQ Question Papers: Campus Placement

Subject: Power System 4

**Part 4: List for questions and answers of Power System **

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**Q1. Inductance of transmission line will decrease when**

**a) Both GMD and GMR increase**

**b) Both GMD and GMR decrease**

**c) GMD increase and GMR decrease**

**d) GMD decrease and GMR increase**

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**Q2. If we increase the spacing between the phase conductors, the line capacitance**

**a) Increases**

**b) Decreases**

**c) Remains unaffected**

**d) None of the above**

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**Q3. If we increase the length of the transmission line, the charging current**

**a) Increases**

**b) Decreases**

**c) Remains unaffected**

**d) None of the above**

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**Q4. In triangular configuration, inductance and capacitance values are —— and —— ****respectively**

**a) Less, less**

**b) Higher, higher**

**c) Less, higher**

**d) Higher, less**

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**Q5. If we increase the spacing between the phase conductors, the value of line inductance**

**a) Decrease**

**b) Increase**

**c) Remains unaffected**

**d) None of the above**

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**Q6. Transmission line parameters of the short transmission line are**

**a) 1,Z,Y,1**

**b) 1,Z,0,1**

**c) 1,0,Y,1**

**d) Z,0,Y,1 **

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**Q7. Surge impedance loading of a 3-phase, 400 kV transmission line is 400 ?. The surge ****impedance loading is**

**a) 400MW**

**b) 800MW**

**c) 1600MW**

**d) 200MW**

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**Q8. Surge impedance loading of a transmission line can be increased by**

**a) Increasing its voltage level**

**b) Addition of lumped inductance in parallel**

**c) Addition of lumped capacitance in series**

**d) Both 1 and 3**

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**Q9. For transmission line which one of the following relation is true?**

**a) AD-B=0**

**b) AD+BC=0**

**c) AD-BC=1**

**d) AD-BC=-1**

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**Q10. A 3-phase transmission line has its conductors at the corners of an equilateral triangle ****with side 3m. The diameter of each conductor is 1.63 cm. The inductance of the line per ****phase per km is**

**a) 1.093mH**

**b) 1.043mH**

**c) 1.182mH**

**d) 1.232mH**

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**Q11. The capacitance of an overhead transmission line increases with**

**a) Increase in mutual geometrical mean distance**

**b) Increase in height of conductors above ground**

**c) Both 1 and 2**

**d) Nether 1 nor 2**

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**Q12. The charging reactance of 50 km transmission line is 1500 ohm. What is the charging ****reactance for 100 km length of line?**

**a) 1500 ohm**

**b) 3000 ohm**

**c) 750 ohm**

**d) 1000 ohm **

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**Q13. Condition for maximum voltage regulation**

**a) Tan φ = X/R**

**b) Tan φ = R/X**

**c) Cos φ = X/R**

**d) Cos φ = R/X**

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**Q14. Condition for zero voltage regulation is**

**a) Tan**** f**** = X/R**

**b) Tan**** f****= R/X**

**c) Cos**** f**** = X/R**

**d) Cos**** f**** = R/X**

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**Q15. Zero voltage regulation is possible only for**

**a) Lagging power factor**

**b) Leading power factor**

**c) Unity power factor**

**d) All of the above**

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**Q16. A 1-phase transmission line has an impedance (3+4j) Ω . Find the power factor of the ****load for achieving maximum and zero voltage regulation?**

**a) 0.6 lag and 0.6 lead**

**b) 0.6 lag and 0.8 lead**

**c) 0.8 lag and 0.8 lead**

**d) 0.8 lag and 0.6 lead**

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**Q17. A transmission line has an impedance of (2+j6) ohm has voltage regulation of 10% at a ****load power factor of 0.8 lag. Find the voltage regulation for a load of 0.6 lead**

**a) 6.92%**

**b) 10%**

**c) -6.92%**

**d) -10%**

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**Q18. A transmission line has 50 km operating at frequency of 500 Hz. Find the type of the ****line?**

**a) Short transmission line**

**b) Long transmission line**

**c) Medium transmission line**

**d) Any of the above **

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**Q19. A transmission line has 200 km operating at frequency of 10 Hz Hz. Find the type of the ****line**

**a) Short transmission line**

**b) Long transmission line**

**c) Medium transmission line**

**d) Any of the above**

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**Q20. In which of the following transmission lines capacitance effect is negligible?**

**a) Long transmission lines**

**b) Shoart transmission lines**

**c) Medium transmission lines**

**d) Both 1 and 3 **

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**Part 4: List for questions and answers of Power System **

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**Q1. Answer: d**

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**Q2. Answer: b**

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**Q3. Answer: b**

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**Q4. Answer: c**

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**Q5. Answer: b**

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**Q6. Answer: b**

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**Q7. Answer: a**

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**Q8. Answer: d**

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**Q9. Answer: c**

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**Q10. Answer: d**

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**Q11. Answer: d**

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**Q12. Answer: c**

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**Q13. Answer: a**

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**Q14. Answer: b**

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**Q15. Answer: b**

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**Q16. Answer: b**

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**Q17. Answer: c**

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**Q18. Answer: b**

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**Q19. Answer: a**

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**Q20. Answer: b**