PSA

resistance

The power loss in an overhead transmission line is mainly due to _____ of the line conductor.
a. resistance
b. inductance
c. capacitance
d. impedance
e. all of the above
f. none of the choices

increased

If the length of a transmission line increases, its inductance is _____.
a. increased
b. decreased
c. the same

less than

The DC resistance of a line conductor is _____ its AC resistance.
a. greater than
b. less than
c. equal

8 µF

If the capacitance between two conductors of a three-phase line is 4 µF, then capacitance of each conductor to neutral is _____.
a. 2 µF
b. 4 µF
c. 8 µF

decreased

If the length of the line is decreased, its capacitance is _____.
a. increased
b. decreased
c. the same

increased

If the supply frequency increases, then the skin effect is _____.
a. increased
b. decreased
c. the same

increases

If the spacing between the conductors is increased, the inductance of the line _____.
a. increases
b. decreases
c. remains the same

less

The skin effect is _____ for stranded conductors than for solid conductors.
a. less
b. more
c. the same

increased

If the conductor diameter decreases, the inductance of the line is _____.
a. increased
b. decreased
c. the same

54

The number of aluminum strands in an ACSR 954,000-cmil, 54/7 Cardinal conductor is _____.
a. 54
b. 7
c. 61
d. 47
e. none of the choices

voltage magnitude, phase angle

The parameters specified on a slack bus are _____ and _____.
a. voltage magnitude, real power
b. voltage magnitude, phase angle
c. active power, reactive power
d. active power, phase angle
e. none of the choices

Referring electrical quantities from one side of the transformer to the other side can be avoided.

Which of the following statements is correct about the per-unit system?
a. Transformer connections affect the per-unit values.
b. Referring electrical quantities from one side of the transformer to the other side can be avoided.
c. Very often, per-unit impedances expand to a very narrow range.
d. None of the choices.

 active power and reactive power

At a load bus, the quantities specified are _____ and _____.
a. active power and reactive power
b. active power and voltage magnitude
c. active power and phase angle
d. voltage magnitude and phase angle
e. none of the choices

imaginary, admittance

Susceptance is _____ part of _____.
a. real, admittance
b. imaginary, admittance
c. real, conductance
d. imaginary, conductance
e. none of the choices

short transmission line

While finding out the relation between Vs and Vr​, capacitance is neglected in a _____.
a. short transmission line
b. medium transmission line
c. long transmission line
d. all of the above

remain the same

If the height of the transmission tower is decreased, the inductance of the line will _____.
a. increase
b. decrease
c. remain the same
d. increase exponentially
e. decrease exponentially

The conductor has 7 strands of steel and 48 strands of aluminum.

If an ACSR conductor has a specification as 48/7, which of the following explanations is correct?
a. The conductor has 48 strands of steel and 7 strands of aluminum.
b. The conductor has 7 strands of steel and 48 strands of aluminum.
c. The conductor has 48 strands.
d. The conductor has 55 strands.

True

The skin effect in the conductor increases the effective value of resistance of the conductor.
a. True
b. False

reduction in transmission losses

The main reason for using high voltage for long-distance power transmission is _____.
a. reduction in transmission losses
b. reduction in line transmission
c. increase in system reliability
d. none of the choices

A portion of the conductor near the surface carries more current in comparison to the core

When an alternating current flows through a conductor:
a. Entire current passes through the core of the conductor.
b. A portion of the conductor near the surface carries more current in comparison to the core.
c. Current remains uniformly distributed over the whole cross-section of the conductor.
d. A portion of the conductor near the surface carries less current in comparison to the core.