Top 150+ Solved Transmission and Distribution of Electrical Energy MCQ Questions Answer
Q. In a D.C. 3-wire distributor using balancers and having unequal loads on the two sides
a. both balancers run as generators
b. both balancers run as motors
c. balancer connected to lightly- loaded side runs as a motor
d. balancer connected to heavily- loaded side runs as a motor
Q. Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased100 percent, saving in copper is
a. 25 percent
b. 50 percent
c. 75 percent
d. 100 percent
Q. A uniformly-loaded D.C. distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is
a. one-fourth
b. one-third
c. one-half
d. twice
Q. As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage toearth uses only
a. 31.25 percent of copper
b. 33.3 percent of copper
c. 66.7 percent of copper
d. 125 percent of copper
Q. Which of the following is usually not the generating voltage ?
a. 6.6 kV
b. 8.8 kV
c. 11 kV
d. 13.2 kV
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. tr
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