Transmission Line Question & Answers March 27, 2023 By Wat Electrical This article lists 100 Transmission Line MCQs for engineering students. All the Transmission Line Questions & Answers below include a hint and a link to the relevant topic wherever possible. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of the Transmission Line. A component designed to carry the power/electricity in electromagnetic form from powerhouses to domestic houses is the transmission line. These are designed by using aluminum substance, copper. They are classified as AC and DC-type transmission lines. The first transmission line design includes an optical fiber. A transmission line has 2 ports, with 2 terminals on each side. A 2 port network is also called a quadrupole. The equivalent circuit components of a transmission line include conductors and air as a medium between the conductors. Resistance, capacitance, and inductance are the values calculated using transmission lines. Z=R+jwL is the series impedance formula of the transmission line of impedance Z, resistance R, and inductor L. The equation of admittance when conductor and capacitance is connected in parallel combination is Y = G + jwc. Transmission line efficiency is calculated using Efficiency = received power / transmitted power * 100. The advantages of a transmission line are mechanical strength, tensile strength, and constant electric field. Power transmission type lines, cables, and telephone-based lines are applications of transmission lines. 1). A transmission line is implemented in ____ type of systems? Electric power Mechanical Electronic Chemical Hint 2). In which of the following are the transmission lines deployed? Antennas Cable TV Filters All the above Hint 3). A transmission line has ____ number of ports? 1 2 3 4 Hint 4). A 2 port network is also called? Quadripole Tripole Dipole Unipole Hint 5). When certain amount of power fed to the transmission line is volatile then its called? Ohmic loss Resistive loss Ohmic heating All the above Hint 6). Which of the following type of waves does a transmission lines carry? Electromagnetic UV IR Visible Hint 7). Which of the following substances are used while designing transmission lines? Aluminum Steel Copper Both a and b Hint 8). Which are the types of transmission lines? AC current DC current AC voltage Both a and b Hint 9). Which type of transmission line transmits over a long distance using 3 conductors? AC DC ADC DAC Hint Read more about Electric Conductors . 10). Which type of transmission line transmits over a long distance using 2 conductors? AC DC ADC DAC Hint 11). Which of the following are the equivalent circuit components of a transmission line? Conductors Air as medium Water Both a and b Hint 12). Which of the following is the series impedance formula of transmission line of impedance Z, resistance R and inductor L? Z=R+jwL Z=R-jwL Z=R/jwL Z=-R/jwL Hint 13). Which of the following is the equation of admittance when conductor and capacitance is connected in parallel combination? Y = G + jwc Y= G - jwc Y= G/jwc Y=G * Jwc Hint 14). Which is the formula for transmission line efficiency? Efficiency = received power / transmitted power * 100 Efficiency = -received power / transmitted power * 100 Efficiency = received power + transmitted power * 100 Efficiency = received power - transmitted power * 100 Hint 15). Which of the following are the types of transmission lines? Open wire Coaxial Optical fiber All the above Hint 16). Which among the following is the first transmission line designed? Open wire Coaxial Optical fiber Microstrip Hint 17). Which of the following are the advantages of optical fiber? Transmits signal over long distance Minimum signal loss Travels at speed of light All the above Hint 18). Which of the following are the data transmission components of optical fiber? Glass Plastic Thread All the above Hint 19). Which of the following are the disadvantages of optical fiber? High installation cost Fragile Complex in bridging All the above Hint 20). Which of the following network configuration does optical fiber replaces? LAN MAN WAN All the above Hint 21). Which of the following are the design considerations of optical cables? Flammability Ruggedness Flexibility All the above Hint 22). In which of the following form does an optical fiber transmits information? Photons Heat Temperature Electrons Hint 23). Which of the following are the components of an optical fiber? Core Cladding Glass All the above Hint 24). Based on which of the following are the optical fibers classified? Refractive index Mode of propagation Materials used All the above Hint 25). Which of the following are material based optical fiber? Plastic optical fiber Glass Water Both a and b Hint Transmission Line MCQs for Students 26). Which of the following type optical fiber mode based is used for shorter distance? Single mode Double mode Tri mode Multi mode Hint 27). Which of the following are the units of bandwidth? Bits/seconds Meters/seconds Meter square/seconds Hertz Hint 28). Which of the following are the functions performed using fiber optic cable? Video call Phone call Website checking All the above Hint 29). In which of the following index type of an optical fiber core is placed inside cladding component? Step index Graded index Short index Clamp index Hint 30). In which of the following index type of an optical fiber does radial distance depends on cables refractive index? Step index Graded index Short index Clamp index Hint 31). Which of the following basic parameter of a transmission line with ground should be maintained large for safer communication? Distance Size Material Height Hint 32). Which of the following substance are used for designing the tower of transmission line? Steel Wood Aluminum Copper Hint 33). Which of the following are the parameters of transmission line? Resistance Inductance Capacitance All the above Hint 34). In which fashion does the information over transmission line is distributed? Uniform Non-uniform Linear Both a and c Hint 35). ___ is induced when current is sent via transmission line? Magnetic flux Power Losses All the above Hint 36). ____ is the term of transmission line states that the emf induced resists current flow? Line of inductance Line of capacitance Line of resistance Line of impedance Hint 37). ___ parameter represents the dielectric medium in a transmission line? Inductance Capacitance Resistance Impedance Hint 38).____ parameter is negligible in transmission line for short length? Inductance Capacitance Resistance Impedance Hint 39). Which of the following parameters are affected via capacitance? Efficiency Voltage regulation Power factor All the above Hint 40). The leakage based current in an shunt type conductance is lead due to? Atmospheric condition Pollution Surface deposit All the above Hint 41). Which of the following are the transmission lines performance parameter? Voltage Current Power loss All the above Hint 42). Which of the following is the voltage regulation formula of a transmission line? Voltage regulation = sending end based voltage – receiving end based voltage / sending end based voltage Voltage regulation = sending end based voltage + receiving end based voltage / sending end based voltage Voltage regulation = sending end based voltage – receiving end based voltage * sending end based voltage Voltage regulation = sending end based voltage + receiving end based voltage * sending end based voltage Hint 43). Which parameter calculates the electric circuit capability? Admittance Impedance Resistance Both b and c Hint 44). Identify the representation of admittance in an transmission line? Y Z R L Hint 45). Which of the following is the units of impedance? Farads Ohms Henrys Columbs Hint 46). Which of the following is the representation of impedance? Y Z R L Hint 47). At which end of transmission line voltage value is greater? Transmitter Receiver Channel Both b and c Hint 48). At which end of transmission line voltage value is lower? Transmitter Receiver Channel Both b and c Hint 49). ____ is the term that defines the condition where voltage value at receiving end is higher than transmission end? Ferranti effect Ohmic effect Capacitive effect Resistive effect Hint Read more about Ferranti effect 50). Which is the distance for considering the capacitance and inductance value in transmission line? 250km 180km 130km 90km Hint Transmission Line MCQs for Exams 51). Which of the following is the voltage value of short transmission line? 69V 70V 80V 60V Hint 52). Which of the following parameter is neglected in an short distance transmission line? Resistance Inductance Capacitance All the above Hint 53). On which factors does resistance factor depends on? Length Area Material All the above Hint 54). Which of the following is the voltage value of long transmission line? 269V 270V 250V 300V Hint 55). Which of the following is the voltage level of long transmission line? 110kV 133kV 200kV Hint 56). Which is the voltage formula of transmission line containing parameters Vs as source voltage, VR as resistance voltage? %VR = (VS –VR)VR * 100 %VR = (VS –VR)VR * 100 %VR = (VS *VR)VR * 100 %VR = (VS –VR)VR Hint 57). Which is the lagging load formula of a transmission line? VR = IR * cos (teta)r + IXL sin (teta)R / VR * 100 VR = IR * cos (teta)r + IXL sin (teta)R / VR * 100 VR = IR * cos (teta)r * IXL sin (teta)R / VR * 100 VR = IR * cos (teta)r + IXL sin (teta)R-VR * 100 Hint 58). Which is the leading load formula of a transmission line? VR = IR * cos (teta)r + IXL sin (teta)R / VR * 100 VR = IR * cos (teta)r - IXL sin (teta)R / VR * 100 VR = IR * cos (teta)r * IXL sin (teta)R / VR * 100 VR = IR * cos (teta)r + IXL sin (teta)R-VR * 100 Hint 59). In which connection type circuit, current flow is maximum? Serial Parallel Concurrent Both b and c Hint 60). ___ is used to calculate voltage drop in a circuit? Ohms law Faradays law Lenz law Newton’s law Hint 61). Voltage drop in a circuit occurs at? Conductors Connectors Contacts All the above Hint Read more about Electric conductors 62). Which of the following is ohms law equation? V=IR I=V/R V=I/R Both a and b Hint 63). What is the load impedance value ZL when a lossless type line of 50ohms is terminated on a ideal resistive load with a voltage standing based wave ration 3. 15 ohms 150 ohms Both a and b Hint 64). Which of the following is the formula od reflection coefficient at load in a lossless transmission type line, when resistance of lossless line and load impedance ZL value is given? T= ZL –Z0 / ZL + Z0 S= 1+|T|/1-|T| Lambda/ 4 nLamda /2 Hint 65). Which is the standing wave ratio on a line formula for a lossless transmission? T= ZL –Z0 / ZL + Z0 S= 1+|T|/1-|T| Lambda/ 4 nLamda /2 Hint 66). What is the load impedance ZL when resistance R is 600 ohms and Inductance is 0.02mH? 600+j628 600-j628 600/j628 -600/j628 Hint 67). Which of the following are the types of conductors used in transmission lines? Solid conductors Homogeneous standard conductors Bundled conductors All the above Hint 68). Which of the following is the material used in solid type conductor? Copper Aluminum Steel Both a and b Hint 69). Which of the following are the advantages of a transmission line? Mechanical strength Tensile strength Constant electric field All the above Hint 70). Which of the following is the application of solid type transmission line? Power transformer Telephone Radio receivers All the above Hint 71). Which of the following are the properties of homogenous standard type conductor? Similar material Greater mechanical strength Less tensile strength All the above Hint 72). Which of the following are the properties of composite stranded type conductor? Multi materials are twisted Enhances tensile strength Low resistance Both a and b Hint 73). Which of the following is the strands value increment when layer size of a composite standard type conductor increases? 1+6+12+18+24+30 1-6+12+18+24+30 1+6+12+18-24+30 1+6-12+18+24+30 Hint 74). Which of the following is the formula to calculate the diameter of stranded type conductor when d, n; solo conductor diameter and no of layers are given of a composite stranded conductor? D = (2n-1) d D = 1/(2n-1) d D = (2n+1) d D = (2n-1)/ d Hint 75). ___ is the term that defines the process to minimize the high voltage based surface gradient via 2/more conductor per phase within a proximity? Conductor bundling Conductor clamping Conductor clipping All the above Hint Transmission Line Questions for Interviews 76). ____ is the parameter that opposes current flow in transmission line? Resistance Inductance Capacitance All the above Hint 77). ____ is the property that defines magnetic field around the conductor? Resistance Inductance Capacitance All the above Hint 78). ___ is the parameter generated due to electrostatic field within conductor? Resistance Inductance Capacitance All the above Hint 79). What is the resistance of a transmission line? R= p l/A R= lamda /l Lamda=2 Pi R Both b and c Hint 80). Which of the following are the spacing observed in capacitance of a transmission line? Symmetrical Unsymmentrical Linear Both a and b Hint 81). Which of the following parameter decreases when line length increases? Resistance Reactance Inductance Capacitance Hint 82). Which parameter of transmission line is unaffected when line distance gap is increased? Resistance Reactance Inductance Capacitance Hint 83). Which parameter of transmission line is decreased when line distance gap is increased? Resistance Reactance Inductance Capacitance Hint 84). Which parameter of transmission line is increased when symmetric based spacing between the line distance gap is increased? Resistance Reactance Inductance Capacitance Hint 85). Which parameter of transmission line is zero relation when symmetric based spacing between the line distance gap is increased? Resistance Reactance Inductance Capacitance Hint 86). Which parameter of transmission line is zero relation when unsymmetric based spacing between the line distance gap is increased? Resistance Reactance Inductance Capacitance Hint 87). Which parameter of transmission line is zero relation when unsymmetric based spacing between the line distance gap is decreased? Resistance Reactance Inductance Capacitance Hint 88). Which parameter of transmission line is zero relation when unsymmetric based on effect of earth? Resistance Reactance Inductance All the above Hint 89). Which parameter of transmission line is increased when unsymmetric based on effect of earth? Resistance Reactance Inductance Capacitance Hint 90). Which parameter of transmission line is decreased when unsymmetric based on effect of earth? Resistance Reactance Inductance Capacitance Hint 91). Which parameter of transmission line is decreased when conductor height increases? Resistance Reactance Inductance Capacitance Hint 92). What is the insulation resistance value when one cable length is 10km, resistance is 1M ohms, and other length is 100km? 0.1MOhm 1Mohm 10mohm 3ohm Hint 93). What is the capacitance formula of single core lead sheathed cable? C= e/ 18 ln[ R/r] C= -e/ 18 ln[ R/r] C= e/ 20 ln[ R/r] Hint 94). Based on which factor the insulation based level of 400Kv EHV is calculated? Lightning over type voltage Radio interference Corona inception voltage Switching based voltage Hint 95). ___ is minimized when bundle based transmission conductors are deployed over high voltage based overheaded transmission line? Loss in Tx line Sag minimise Corona minimize strength minimise Hint 96). __ is the reason behind transmission line corona? Ionization Collision Deformation Collation Hint 97). Which of the following are positive charge carriers? Electron Protons Neutrons Both a and b Hint 98). Which of the following are negative charge carriers? Electron Protons Neutrons Both a and b Hint 99). Which are applications of ionization? Fluorescent lamp Electric discharge lamp Bike lamps Both a and b Hint 100). What is the resistance value of an ideal transmission line? 0 ohms Infinite 0.1 ohms 5ohms Hint Time's up
