1. The resistance of a transmission line conductor depends on:
(A) Conductor material and length only
(B) Conductor material, length, and cross-sectional area
(C) Voltage only
(D) Tower height
2. The resistance of a conductor increases with:
(A) Decrease in temperature
(B) Increase in temperature
(C) Increase in conductor diameter
(D) Shorter conductor length
3. What is the unit of resistance per unit length?
(A) Ohm
(B) Ohm/km
(C) Ohm/volt
(D) Ohm/m²
4. Skin effect in AC transmission lines causes:
(A) Reduction of effective resistance at high frequency
(B) Increase of effective resistance at high frequency
(C) No change in resistance
(D) Only affects capacitance
5. The inductance of a transmission line depends mainly on:
(A) Conductor spacing and geometry
(B) Conductor material only
(C) Tower height only
(D) Line voltage only
6. For a single-phase line with two conductors, the inductance per unit length is given by:
(A) L = 2 × 10⁻⁷ ln(D/r) H/m
(B) L = 10⁻⁶ × D H/m
(C) L = 2 × 10⁻⁷ D² H/m
(D) L = 10⁻⁷ / D H/m
7. In three-phase lines, the concept of Geometric Mean Distance (GMD) is used to:
(A) Calculate resistance
(B) Calculate inductance
(C) Calculate capacitance only
(D) Calculate sag
8. The effect of conductor bundling on line inductance is:
(A) Increases inductance
(B) Reduces inductance
(C) No effect
(D) Only affects capacitance
9. The capacitance of a transmission line depends on:
(A) Conductor spacing and radius
(B) Conductor material only
(C) Tower height only
(D) Line current only
10. The capacitance per phase of a single-phase line with two conductors is:
(A) C = 2πε₀ / ln(D/r) F/m
(B) C = 2πε₀ ln(D/r) F/m
(C) C = 2π / ln(D/r) F/m
(D) C = 1 / 2πε₀ ln(D/r) F/m
11. Line resistance is considered:
(A) Series parameter
(B) Shunt parameter
(C) Both series and shunt
(D) Neither
12. Line inductance is considered:
(A) Series parameter
(B) Shunt parameter
(C) Both
(D) Neither
13. Line capacitance is considered:
(A) Series parameter
(B) Shunt parameter
(C) Series and shunt
(D) None
14. In three-phase lines, the Geometric Mean Radius (GMR) is used to:
(A) Calculate resistance
(B) Calculate inductance
(C) Calculate capacitance
(D) Calculate line sag
15. The unit of inductance per unit length is:
(A) Ohm/km
(B) Henry/km
(C) Farad/km
(D) Volt/km
16. The unit of capacitance per unit length is:
(A) Ohm/km
(B) Henry/km
(C) Farad/km
(D) Volt/km
17. The self-inductance of a conductor depends on:
(A) Its radius and spacing from other conductors
(B) Conductor length only
(C) Line voltage
(D) Tower height
18. Mutual inductance between conductors depends on:
(A) Distance between conductors
(B) Conductor radius only
(C) Tower height only
(D) Voltage
19. In a three-phase line, the inductance per phase can be calculated using:
(A) L = 2 × 10⁻⁷ ln(GMD/GMR) H/m
(B) L = 10⁻⁶ × ln(GMD/GMR) H/m
(C) L = 10⁻⁷ × ln(D/r) H/m
(D) L = 2 × 10⁻⁶ ln(D/r) H/m
20. The capacitance per phase in a three-phase line is calculated using:
(A) C = 2πε₀ / ln(GMD/GMR) F/m
(B) C = 2π / ln(D/r) F/m
(C) C = 2πε₀ ln(D/r) F/m
(D) C = ε₀ / ln(D/r) F/m
21. Stranded conductors are used to:
(A) Reduce skin effect
(B) Reduce line resistance
(C) Reduce corona loss
(D) Increase sag
22. Line resistance is negligible in:
(A) Short lines only
(B) Medium and long lines
(C) Underground cables
(D) DC transmission
23. Transposition of transmission lines is done to:
(A) Reduce resistance
(B) Balance inductance and capacitance among phases
(C) Reduce sag
(D) Reduce corona loss
24. The inductive reactance per unit length of a transmission line is given by:
(A) X_L = 2πfL Ω/km
(B) X_L = L/f Ω/km
(C) X_L = f/L Ω/km
(D) X_L = 2πL/f Ω/km
25. The capacitive reactance per unit length of a line is:
(A) X_C = 1 / (2πfC) Ω/km
(B) X_C = 2πfC Ω/km
(C) X_C = 1 / C Ω/km
(D) X_C = C Ω/km
26. The effective resistance of a conductor in AC is more than DC resistance due to:
(A) Skin effect
(B) Corona
(C) Capacitance
(D) Sag
27. Bundle conductors reduce:
(A) Resistance only
(B) Inductive reactance and corona loss
(C) Capacitance only
(D) Voltage drop only
28. The total series impedance of a line per unit length is:
(A) Z = R + jX_L
(B) Z = R + jX_C
(C) Z = 1 / (R + jX_L)
(D) Z = R × jX_L
29. The shunt admittance of a line per unit length is:
(A) Y = G + jB
(B) Y = R + jX
(C) Y = jX only
(D) Y = 1 / Z
30. To calculate resistance per km for a conductor at operating temperature, which factor must be considered?
(A) Temperature coefficient of resistance
(B) Line voltage
(C) Conductor spacing
(D) Tower height