Q1. The nominal-T model of a transmission line is more accurate than the nominal-π model for:
A) Short lines
B) Medium lines
C) Long lines
D) All lines
Ans: B
Q2. In a short transmission line, which element is neglected?
A) Resistance
B) Inductance
C) Capacitance
D) Conductance
Ans: C
Q3. The π-model of a transmission line is used for:
A) Short lines
B) Medium lines
C) Long lines
D) Both medium and long lines
Ans: B
Q4. For a short transmission line, the line is represented by:
A) Series impedance only
B) Shunt admittance only
C) Both series impedance and shunt admittance
D) None of the above
Ans: A
Q5. In a medium transmission line, the effect of shunt capacitance is:
A) Neglected
B) Considered lumped at one point
C) Considered lumped at two points
D) Considered distributed uniformly
Ans: C
Q6. For long transmission lines, line parameters are considered:
A) Lumped
B) Negligible
C) Distributed
D) Concentrated
Ans: C
Q7. The ABCD constants of a transmission line represent:
A) Voltage and current relations between sending and receiving ends
B) Power and voltage relations
C) Voltage and impedance relations
D) None of these
Ans: A
Q8. In nominal-π model, half of the shunt capacitance is placed at:
A) Sending end
B) Receiving end
C) Both ends
D) Middle of the line
Ans: C
Q9. The surge impedance of a transmission line depends on:
A) Resistance and inductance
B) Inductance and capacitance
C) Resistance and capacitance
D) None of the above
Ans: B
Q10. The long transmission line is generally considered when its length is greater than:
A) 50 km
B) 80 km
C) 150 km
D) 250 km
Ans: D
Q11. The charging current in transmission lines is due to:
A) Resistance
B) Inductance
C) Capacitance
D) Leakage conductance
Ans: C
Q12. In the nominal-T model, the line capacitance is placed:
A) At the middle
B) At both ends
C) At the sending end
D) At the receiving end
Ans: A
Q13. The Ferranti effect is more prominent in:
A) Short lines
B) Medium lines
C) Long lines
D) None of these
Ans: C
Q14. The propagation constant of a transmission line is given by:
A) √(ZY)
B) ZY
C) Z/Y
D) Y/Z
Ans: A
Q15. The characteristic impedance of a lossless line is:
A) √(L/C)
B) √(R/G)
C) √(C/L)
D) √(G/R)
Ans: A
Q16. A short transmission line can be represented by:
A) ABCD matrix with A = D = 1, B = Z, C = 0
B) A = D = 0, B = 1, C = Z
C) A = B = 0, C = D = 1
D) None
Ans: A
Q17. In a transmission line, the effect of capacitance becomes significant when line length exceeds:
A) 50 km
B) 80 km
C) 100 km
D) 150 km
Ans: B
Q18. For a short line, voltage regulation depends mainly on:
A) Line resistance and reactance
B) Capacitance
C) Charging current
D) None of these
Ans: A
Q19. The effect of resistance in a transmission line causes:
A) Voltage drop
B) Phase shift
C) Power loss
D) All of the above
Ans: D
Q20. The total charging current in a medium transmission line is equal to:
A) YV
B) 2YV
C) YV/2
D) 3YV/2
Ans: A
Would you like me to continue with next 30 advanced or GATE-level MCQs on transmission line models (including ABCD constants, Ferranti effect, and surge impedance)?
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ChatGPT said:
Here are the next 30 advanced Transmission Line Models MCQs (21–50) in your preferred format:
Q21. The ABCD constants of a symmetrical transmission line satisfy the condition:
A) AD – BC = 0
B) AD – BC = 1
C) AB – CD = 1
D) A + D = 0
Ans: B
Q22. For a lossless transmission line, the propagation constant is:
A) Real
B) Imaginary
C) Zero
D) Complex
Ans: B
Q23. The unit of the propagation constant γ is:
A) Henry
B) Ohm
C) Per meter
D) Farad
Ans: C
Q24. In a lossless line, attenuation constant α is:
A) Zero
B) Infinite
C) Equal to β
D) None of the above
Ans: A
Q25. The “A” constant of a medium transmission line nominal-π model is:
A) 1 + (YZ/2)
B) 1 + (YZ/4)
C) 1 + (YZ/6)
D) 1 + (Y²Z/2)
Ans: B
Q26. The receiving-end voltage in a long line is related to sending-end voltage by:
A) Vₛ = AVᵣ + BIᵣ
B) Vᵣ = AVₛ + BIₛ
C) Iᵣ = CVₛ + DIₛ
D) None
Ans: A
Q27. In a transmission line, the term “A” in ABCD parameters represents:
A) Voltage ratio
B) Current ratio
C) Transfer voltage ratio at no-load
D) None
Ans: C
Q28. The surge impedance loading (SIL) of a transmission line is given by:
A) (V²/Zc)
B) (V²/Yc)
C) (V²/ZL)
D) (V/Zc²)
Ans: A
Q29. For a distortionless line, the condition is:
A) R/L = G/C
B) R/C = L/G
C) RC = LG
D) R = G
Ans: A
Q30. The Ferranti effect is due to:
A) Line resistance
B) Line capacitance
C) Line inductance
D) Both inductance and capacitance
Ans: D
Q31. The effect of Ferranti effect is more pronounced at:
A) Low voltage and short lines
B) High voltage and long lines
C) Low voltage and long lines
D) High voltage and short lines
Ans: B
Q32. The characteristic impedance of a line is independent of:
A) Resistance
B) Inductance
C) Capacitance
D) Frequency (for lossless line)
Ans: D
Q33. A distortionless line will have:
A) Attenuation constant independent of frequency
B) Phase constant proportional to frequency
C) Constant velocity of propagation
D) All of the above
Ans: D
Q34. The velocity of propagation of electromagnetic waves in a line is given by:
A) 1/√(LC)
B) √(L/C)
C) √(C/L)
D) 1/(LC)
Ans: A
Q35. For a short line, shunt capacitance is:
A) Neglected
B) Doubled
C) Halved
D) Included
Ans: A
Q36. In a nominal-π model, shunt capacitors are placed:
A) At both ends equally
B) At one end only
C) At the middle
D) None
Ans: A
Q37. A 200 km, 220 kV line is considered as:
A) Short line
B) Medium line
C) Long line
D) Very long line
Ans: C
Q38. For a 50 km, 11 kV line, the appropriate model is:
A) Short line
B) Medium line
C) Long line
D) Nominal π
Ans: A
Q39. The per-unit-length parameters of a line are:
A) R, L, G, C
B) Z, Y
C) R, L, C
D) R, G, C
Ans: A
Q40. The primary cause of power loss in a transmission line is:
A) Capacitance
B) Inductance
C) Resistance
D) Reactance
Ans: C
Q41. In ABCD parameters, if the line is symmetrical, then:
A) A = D
B) B = C
C) A ≠ D
D) AD – BC ≠ 1
Ans: A
Q42. The magnitude of surge impedance for an overhead line is about:
A) 50 Ω
B) 100 Ω
C) 300–400 Ω
D) 800 Ω
Ans: C
Q43. The line efficiency is given by:
A) (Receiving end power / Sending end power) × 100
B) (Sending end power / Receiving end power) × 100
C) (Receiving end voltage / Sending end voltage) × 100
D) None
Ans: A
Q44. The regulation of a transmission line is mainly affected by:
A) Power factor
B) Resistance
C) Inductance
D) All of the above
Ans: D
Q45. The effect of shunt capacitance on a transmission line is to:
A) Decrease voltage drop
B) Increase power loss
C) Increase voltage drop
D) None
Ans: A
Q46. The nominal-T model is better than nominal-π model when:
A) Line is shorter
B) Line has high capacitance
C) Line is longer
D) Line has low capacitance
Ans: C
Q47. A long line may be represented by:
A) Distributed parameter model
B) Nominal-T model
C) Nominal-π model
D) Both B and C
Ans: A
Q48. When the line is short-circuited, the impedance measured from the sending end is:
A) Surge impedance
B) Input impedance
C) Characteristic impedance
D) None
Ans: B
Q49. The product of propagation constant (γ) and length (l) is known as:
A) Electrical length
B) Mechanical length
C) Surge impedance
D) Reactance
Ans: A
Q50. The attenuation of a long line primarily depends on:
A) Resistance and conductance
B) Inductance and capacitance
C) Reactance
D) Surge impedance
Ans: A
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