Top 80+ Solved Transmission and Distribution MCQ Questions Answer
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 followingbus-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 transfer scheme
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 current
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 transformers
Q. jCorona usually occurs when the electrostatic stress in air around the conductorexceeds
a. 6.6 kV (r.m.s. value)/cm
b. 11 kV (r.m.s. value)/cm
c. 22 kV (maximum value)/cm
d. 30 kV (maximum v^lue)/cm
Q. The voltage drop, for constant voltage transmission is compensated by installing
a. inductors
b. capacitors
c. synchronous motors
d. all of above
Q. The use of strain type insulators is made where the conductors are
a. dead ended
b. at intermediate anchor towers
c. any of the above
d. none of the above
Q. The current drawn by the line due to corona losses is
a. non-sinusoidal
b. sinusoidal
c. triangular
d. square
Q. Pin type insulators are generally not used for voltages beyond
a. 1 kV
b. 11 kV
c. 22 kV
d. 33 kV