Electrical Engineering · Question Bank
Transmission Lines
168 questions · page 8 of 9. Answer in your head first, then check the solution.
#141📘 EE Pocket Reviewer RojasEasy
During typhoons, the live conductor of an electric supply lines may break down and will touch the ground. Which of the statements is true?
AThe supply voltage will reduce to zero
BNo current will flow in the conductor
CCurrent will flow to earth
DThe supply voltage will increase
#142📘 EE Pocket Reviewer RojasEasy
Overhead lines generally use what type of wires?
ACopper conductors
BACSR conductors
CAll aluminum conductors
DAny of these
#143📘 EE Pocket Reviewer RojasEasy
What is the current drawn by the line conductors due to corona losses?
ASinusoidal current
BNon-sinusoidal current
CTriangular current
DDirect current
#144📘 EE Pocket Reviewer RojasEasy
The topmost conductor in a high voltage transmission line is what conductor?
APhase-a conductor
BPhase-b conductor
CPhase-c conductor
DEarth conductor
#145📘 EE Pocket Reviewer RojasEasy
The occurrence of corona is highly possible in which of the following weather conditions?
ASummer
BHumid weather
CDry weather
DWinter
#146📘 EE Pocket Reviewer RojasEasy
What is the reason why the presence of ozone as a result of corona is harmful in a transmission line?
AIt will cause corrosion to the conductor
BIt will cause the power factor of the line to drop
CIt will cause to delay the transmission of power
DAll of these
#147📘 EE Pocket Reviewer RojasEasy
What do you call the conductors which connect the consumer’s terminals to the distribution lines?
AService mains
BFeeders
CBranch circuits
DDistributors
#148📘 EE Pocket Reviewer RojasEasy
In a power system, a three-phase, four wire system is commonly used where?
APrimary transmission
BSecondary transmission
CPrimary distribution
DSecondary distribution
#149📘 EE Pocket Reviewer RojasEasy
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
#150📘 EE Pocket Reviewer RojasEasy
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
#151📘 EE Pocket Reviewer RojasEasy
Which of the following materials are used in making ground wires?
AStainless steel
BGalvanized steel
CCast iron
DAluminum
#152📘 EE Pocket Reviewer RojasEasy
In the ACSR conductors, what is the insulation between the aluminum and steel conductors?
AInsulin
BBitumen
CVarnish
DNo insulation
#153📘 EE Pocket Reviewer RojasEasy
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
#154📘 EE Pocket Reviewer RojasEasy
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
#155📘 EE Pocket Reviewer RojasEasy
On which of the following does the size of a feeder depend?
ACurrent carrying capacity
BVoltage drop
CVoltage
DFrequency
#156📘 EE Pocket Reviewer RojasEasy
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
#157📘 EE Pocket Reviewer RojasEasy
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
#158📘 EE Pocket Reviewer RojasEasy
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
#159📘 EE Pocket Reviewer RojasEasy
Transmission line insulators are made from which of the following materials?
AGlass
BPorcelain
CPaper
DPVC
#160📘 EE Pocket Reviewer RojasEasy
Which of the following cause transient disturbances in the transmission lines?
AFaults
BLoad variations
CSwitching operations
DAll of these
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