Top 150+ Solved Transmission and Distribution of Electrical Energy MCQ Questions Answer
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 ll kV 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)
Q. A conductor, due to sag between two supports, takes the form of
a. semi-circle
b. triangle
c. ellipse
d. catenary
Q. In AC.S.R. conductors, the insulation between aluminium and steel conductors is
a. insulin
b. bitumen
c. varnish
d. no insulation is required
Q. Which of the following bus-bar schemes has the lowest cost ?
a. Ring bus-bar scheme
b. Single bus-bar scheme
c. Breaker and a half scheme
d. Main and tr
Q. Owing to skin effect
a. current flows through the half cross-section of the conductor
b. portion of the conductor near the surface carries more current and core of the conductor carries less current
c. portion of the conductor near the surface carries less current and core of the conductor carries more cur¬rent
d. any of the above
Q. By which of the following methods string efficiency can be improved ?
a. Using a guard ring
b. Grading the insulator
c. Using long cross arm
d. Any of the above
Q. In aluminium conductors, steel core is provided to
a. compensate for skin effect
b. neutralise proximity effect
c. reduce line inductance
d. increase the tensile strength
Q. By which of the following a bus-bar is rated ?
a. Current only
b. Current and voltage
c. Current, voltage and frequency
d. Current, voltage, frequency and short time current
Q. A circuit is disconnected by isolators when
a. line is energized
b. there is no current in the line
c. line is on full load
d. circuit breaker is not open
Q. For which of the following equipment current rating is not necessary ?
a. Circuit breakers
b. Isolators
c. Load break switch
d. Circuit breakers and load break switches
Q. In a substation the following equipment is not installed
a. exciters
b. series capacitors
c. shunt reactors
d. voltatre tr