What do you call the phenomenon in which the current carried by a conductor is more on the surface than in the core?
ACorona effect
BResonance effect
CDoppler effect
DSkin effect
Electrical Engineering · Question Bank
Transmission Lines
80 of 168 questions match · page 4 of 4. Answer in your head first, then check the solution.
To increase the capacity of a transmission line for transmitting power which of the following must be decreased?
ACapacitance
BLine inductance
CVoltage
DAll of these
Which of the following materials are used in making ground wires?
AStainless steel
BGalvanized steel
CCast iron
DAluminum
In the ACSR conductors, what is the insulation between the aluminum and steel conductors?
AInsulin
BBitumen
CVarnish
DNo insulation
Extra high voltages are needed for long distance transmission, to reduce which of the following?
ACurrent and the voltage drop
BPower factor and the voltage drop
CCurrent and cross-sectional area of the wires
DVoltage drop and the cross-sectional area of the wires
The volume of copper required for the conductors in an ac transmission line is inversely proportional to which of the following?
AVoltage and current
BVoltage and power factor
CCurrent and power factor
DVoltage, current and power factor
On which of the following does the size of a feeder depend?
ACurrent carrying capacity
BVoltage drop
CVoltage
DFrequency
Suspension insulators are used in which of the following types of transmission line?
ALow voltage transmission line
BHigh voltage transmission line
CSingle-phase transmission line
DThree-phase transmission line
Which of the following will increase the transmission efficiency of a line?
AVoltage decreases and power factor increases
BVoltage increases and power factor decreases
CBoth voltage and power factor decreases
DBoth voltage and power factor increases
What is the purpose of steel in an ACSR conductor?
ATo carry the ground current
BTo provide additional mechanical strength
CTo reduce corona losses
DTo reduce the inductance and improve pf
Transmission line insulators are made from which of the following materials?
AGlass
BPorcelain
CPaper
DPVC
Which of the following cause transient disturbances in the transmission lines?
AFaults
BLoad variations
CSwitching operations
DAll of these
In which of the following cases shunt capacitance is negligible?
AShort length transmission lines
BMedium length transmission lines
CLong length transmission lines
DExtra long length transmission lines
What material is commonly used for the insulation in high voltage cables?
ALead
BPaper
CRubber
DPorcelain
A conductor, due to sag between the two supporting towers takes the form of which one?
ASemi-circle
BTriangle
CParabola
DCatenary
Which of the following ACSR conductors has 7 steel strands surrounded by 25 aluminum conductors?
A25/7
B7/25
C32/25
D32/7
In aluminum wires, the steel core is provided for what purpose?
ATo reduce the inductance of the wire
BTo compensate the skin effect in the wire
CTo increase the cross-section of the wire
DTo increase the tensile strength of the wires
What is the name of the phenomenon of the rise in voltage at the receiving end of the open circuited or lightly loaded line?
ASeebeck effect
BFerranti effect
CCorona effect
DSkin effect
Which one is the reason why conductors for high voltage transmission lines are suspended from the towers?
ATo increase clearance from ground
BTo reduce wind loads
CTo reduce the line losses
DTo reduce corona
A distributor is designed for which of the following point of view?
ACurrent carrying capacity
BVoltage drop
CAmpere-hour
DVolt-amperes
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