Top 80+ Solved Transmission and Distribution MCQ Questions Answer
Q. For an overhead line, the surge impedance is taken as
a. 20-30 ohms
b. 70—80 ohms
c. 100—200 ohms
d. 500—1000 ohms
Q. The presence of ozone due to corona is harmful because it
a. reduces power factor
b. corrodes the material
c. gives odour
d. transfer energy to the ground
Q. A feeder, in a transmission system, feeds power to
a. distributors
b. generating stations
c. service mains
d. all of the above
Q. The power transmitted will be maximum when
a. corona losses are minimum
b. reactance is high
c. sending end voltage is more
d. receiving end voltage is more
Q. A 3-phase 4 wire system is commonly used on
a. primary transmission
b. secondary transmission
c. primary distribution
d. secondary distribution
Q. Which of the following materials is used for overhead transmission lines ?
a. Steel cored aluminium
b. Galvanised steel
c. Cadmium copper
d. Any of the above
Q. Which of the following is not a constituent for making porcelain insulators ?
a. Quartz
b. Kaolin
c. Felspar
d. Silica
Q. There is a greater possibility of occurence of corona during
a. dry weather
b. winter
c. summer heat
d. humid weather
Q. Which of the following relays is used on long transmission lines ?
a. Impedance relay
b. Mho's relay
c. Reactance relay
d. None of the above
Q. The steel used in steel cored conductors is usually
a. alloy steel
b. stainless steel
c. mild steel
d. high speed steel
Q. Which of the following distribution systems is more reliable ?
a. Radial system
b. Tree system
c. Ring main system
d. All are equally reliable
Q. Which of the following characteristics should the line supports for transmission lines possess ?
a. Low cost
b. High mechanical strength
c. Longer life
d. All of the above
Q. Transmission voltage of llkV is normally used for distances upto
a. 20—25 km
b. 40—50 km
c. 60—70 km
d. 80—100 km
Q. Skin effect is proportional to
a. (conductor diameter)
b. (conductor diameter)
c. (conductor diameter)
d. (conductor diameter)