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WorksheetsTransmission Line Basics Quiz
Total questions: 10
Worksheet time: 5mins
Transmission lines are typically modeled:
On a three-phase basis
On a per-phase basis
Using DC approximations only
Ignoring line parameters
Which parameters represent the distributed nature of a transmission line?
R, L, C, G
V, I, P, Q
A, B, C, D
X, Y, Z
For a short transmission line model, which component is usually neglected?
Resistance
Inductance
Capacitance
Reactance
The short transmission line model is generally valid for:
Length < 80 km
Length between 80 km and 250 km
Length > 250 km
Any length if voltage is below 69 kV
The nominal π model is used for:
Short lines
Medium lines
Long lines
DC networks
In the two-port representation of a transmission line, the constants A and D are:
Equal and dimensionless
Equal and measured in ohms
Different and measured in siemens
Always zero
For a long transmission line, the propagation constant γ is given by:
γ = Z × Y
γ = √(ZY)
γ = Z/Y
γ = 1/(ZY)
The Ferranti Effect refers to:
Voltage drop at the receiving end under heavy load
Voltage rise at the receiving end under light load
Voltage regulation under full load
Voltage collapse during faults
Surge impedance loading (SIL) occurs when:
Reactive power is maximum
Reactive power is zero
Voltage and current are out of phase
Line losses are maximum
For a lossless line, the characteristic impedance Zc is:
Purely inductive
Purely capacitive
Purely resistive
Complex with both real and imaginary parts
