Related MCQ Question

• The rated voltage of a 3-phase power is given as 
• Which of the following is usually not the generating voltage?
• In a Transmission system the feeder supplies power to 
• Feeder is designed mainly from the point of view of 
• Distributors are designed from the point of view of
• Transmission and Distribution of electric power by underground system is superior to overhead system in respect of
• The main drawback of underground system over overhead system  is
• The main drawback of overhead system over underground system  is
• By increasing the Transmission voltage double of its original value, the same power can be dispatched keeping the line loss
• The volume of copper required for an ac Transmission line is inversely proportional to 
• For the same conductor length, same amount of power, same losses and same maximum voltage to earth, which system required minimum conductor area?
• Which of the following distribution system is preferred for good efficiency and high economy?
• The main reason for using high voltage for long distance power transmission is
• 66 kV is suitable for transmission of power over 
• If  3 MW  power is to be transmitted over a distance of  30 km,  the desirable transmission voltage will be 
• The highest transmission voltage used in India is
• For high-voltage transmission lines, conductors are suspended from towers to
• The supports used for transmission lines should have the characteristics  of
• The wooden poles well impregnated with creosote oil or any preservative compound have life of
• Steel poles for transmission lines need protection against 
• RCC poles usually have the spans of 
• In India for distribution of electric power we usually use 
• Conductors used in high tension transmission lines are stranded because of
• Which of the following properties has got higher value for aluminium in comparison to that of copper?
• Grease is added between steel and aluminium conductors  in a ACSR Conductors to
• ACSR is used in place of copper in overhead lines because of 
• ACSR conductors have
• The function of steel wire in an  ACSR conductor is to 
• The material used for the manufacture of ground wire is
• Guy wire is employed for 
• The sag of a transmission line is least affected owing to
• Effect of temperature rise in overhead lines is to 
• In a transmission line, sag depends upon
• The maximum tension in a section of overhead line conductor between two supports of unequal height occurs at 
• Stringing chart is useful 
• Hot template curves are plots of
• The effect of wind pressure is more predominant on
• Galloping in transmission line conductors arises due to 
• Which of the following is reduced by using stock bridge dampers on power overhead transmission lines?
• The spacing between phase conductors of 400 kV line is around 
• The diameter of each strand is  d  then the diameter of  n-layer  stranded conductor will be 
• Strain type insulators are used 
• Wavy structure of pin insulator increases its
• Which type of insulator is used on  132 kV transmission lines  ?
• Whenever the conductors are dead-ended or there is a change in the direction of transmission line, the insulators used are of the 
• The number of discs in a string of insulators for  400 kV  ac overhead transmission line lies in the range of 
• 100 percent string efficiency means 
• If the frequency of a transmission system is changed from  50 Hz to 100 Hz, the string efficiency
• The string efficiency of a high-voltage line is around 
• The insulators may fail due to 
• The purpose of guard ring in transmission lines is to 
• The effect of corona can be detected by
• Corona loss in a transmission line increases with
• The good effect of corona on overhead lines is to 
• Corona loss can be reduced by the use of hollow conductors because
• Corona occurs between two transmission conductors when they 
• The corona occurs in humid weather at a voltage 
• The effect of corona in a transmission line is
• The charging current in a transmission line increases due to corona effect because corona increases 
• The chances of occurrence of corona are maximum during 
• Corona is likely to occur maximum in case of
• The only advantage of corona is that it
• The dielectric strength of air is
• Visual critical voltage is
• Critical voltage limit of a transmission line is increased by
• The corona effect can be minimized by increasing
• Corona losses in transmission lines are minimized when
• In a transmission line the distributed constants are 
• Skin effect depends upon
• Skin effect in transmission line is due to
• Increasing the frequency of transmission line will 
• The skin effect of a conductor reduces with the increase in 
• The inductance of single-phase two-wire power transmission line per  km  gets doubled when the 
• The inductance of a power transmission line increases with 
• The inductance of a transmission line minimum when 
• Hollow conductors are used in transmission lines to
• For a stranded conductor, the ratio of GMR to actual radius is 
• The bundled conductors in EHV transmission system provides
• Bundled conductors are mainly used in high voltage overhead transmission lines to
• Capacitance in equivalent circuit of transmission line is due to 
• If the separation between the three phases of transmission line in increased then 
• Bundled conductors are used to
• If the effect of earth is taken into account, then the capacitance of line to ground 
• Transmission lines are transposed to
• The concept of an electrically short, medium and long line is primarily based on the 
• Which of the following is neglected while analyzing a short transmission line?
• Which of the following voltage regulation is considered to be the best for transmission lines?
• Transmission efficiency of a transmission line increases with the 
• Under no-load conditions, the current in a transmission line is because of
• In a long transmission line under no-load condition 
• Ferranti effect on long overhead lines is experienced when?
• Ferranti effect happens in transmission line when the line is
• The characteristic impedance of a transmission line depends upon 
• For a lossy transmission line, the characteristic impedance does  not  depend on
• When the characteristic impedance of a transmission line is equal to the load impedance
• The Characteristic impedance of transmission line
• The surge impedance value of an overhead line usually in the range of
• A transmission line is distortion-less if
• When the load on a transmission line is equal to the surge impedance loading 
• The Surge impedance loading SIL of a single circuit  220 kV  line is about 
• Full-load compensation in a transmission line requires
• To increase the transmission capability of a high voltage long line 
• Power dispatch through a transmission line can be increased by
• The power transmitted will be maximum when 
• Phase modifier is normally installed in case of
• Conduit pipes are generally used for protection of
• Sheaths are used in cables to
• The bedding on a cable consists of
• Metallic shielding is provided on underground cable to 
• The thickness of metallic shielding on cables is usually
• The thickness of insulation layer provided on the conductor in cables depends upon
• The undesirable property of an electrical insulating material is 
• The disadvantage with paper as insulating material is
• The dielectric strength of impregnated paper is about 
• Multi-core cables generally use 
• Solid type cables are not considered suitable for operating voltages exceeding  66 kV  because 
• The advantage of oil filled cables is
• Cables used for  220 kV lines are invariably 
• The insulation use in a cable designed for use on  1,000 kV  is usually 
• Sulphur hexafluoride cable is insulated by 
• Internal pressure cables have the advantages of
• With the rise in temperature, the insulation resistivity of a cable
• The power factor of an open-ended cable can be improved by 
• The capacitance of a cable increases
• The capacitance of a cable depends upon the 
• The charging current drawn by the cable 
• The electrostatic stress in underground cables is
• The breakdown of insulation of a cable can be avoided economically by using 
• Capacitance grading of cable means
• Grading of cables
• While crossing a road the cable should be 
• The source of heat generation in cables  is
• A cable carrying alternating current has
• The current carrying capacity of cables in DC is more than that in AC mainly due to 
• The lead sheath of the cable may get damaged due to 
• The breakdown voltage of a cable depends upon
• Breakdown of cable insulation may occur due to
• Fiber-optic cables are used in power system applications mainly for
• The main criteria for selection the size of a distributor for a radial distribution system is
• The distribution system in India are mostly
• In a distribution system, which of the following items shares the major cost?
• The distribution in residential areas are 
• The loads on 3-phase, 4-wire distributors are usually 
• In a dc 3-wire distribution system, balancer fields are cross-connected in order to
• The conductor of an EHV line is selected on the basis of 
• Series capacitor is used in a transmission line to
• Series capacitive compensation in EHV transmission lines is used to 
• Shunt compensation in an EHV line is used to improve 
• The most accurate and versatile method of achieving reactive power compensation is using 
• Insulation coordination for UHV lines (above 500 kV) is done based on
• Which of the following is not an advantage of DC transmission?
• In an HVDC system :
• In a dc transmission line
• High Voltage DC (HVDC) transmission is mainly used for
• Bulk power transmission over long High Voltage DC lines is preferred because of
• The power transmission capability of bipolar lines is approximately 
• The method used to implement an asynchronous link is
• High Voltage DC monopolar link uses
• Back to back High Voltage DC is used to
• Which of the following will be provided to reduce the harmonics on ac side of an HVDC transmission line?
• In HVDC transmission there are predominant 
• High voltage dc transmission requires filters for