What is the
result of Skin Effect?
Consider the
following statements regarding corona :
1. It causes
radio interference.
2. It
attenuates lighting surges.
3. It causes
power loss.
4. It is more
prevalent in the middle conductor of a transmission line employing flat
conductor configuration.
Which of the
above statements are correct ?
If supply
frequency increases, the skin effect is :
The skin
effect does not depends upon –
The skin
effect does not depend on:
The phenomena
arising due to unequal distribution of current over the entire cross - section
of the conductor in a long - distance transmission line is referred to as :
DC current
flowing through a conductor:
Bundled
conductors are mainly used in high voltage overhead transmission lines is
The good
effect of corona on overhead lines is to
Which one of
the following statements is NOT correct for the use of bundled conductors in
transmission lines ?
The current
drawn by the line due to corona losses is
Presence of ozone as a result of corona is harmful because
Ferranti effect is observed in case of the, ^
The corona
loss depends on which of the following parameters ?
Which one of the following statements is correct? Corona loss increases
with
The advantage
of corona is that, it results into,
The
phenomenon of violet glow, hissing noise and production of ozone gas in an
overhead transmission line is known as corona can be reduced
Which of the
following effects is resulted because of the size of the conductor, frequency
and the specific resistance of the conducting material ?
Skin effect is only noticeable at _________ frequencies.
Corona losses
in transmission lines are minimized when
Stranded
wires are mainly used to
Hollow
conductors are used in the transmission lines to :
By using bundle conductors, what will be the effect on the critical
voltage required for the formation of corona?
Corona occurs
between two transmission conductors when they
Which of the following is not a valid advantage of bundle conductor?
When bundle
of conductors are used in place of single conductors the effective inductance
and capacitance will, respectively
Due to skin effect the resistance in D.C. supply is :
Corona loss
is minimum in.
Corona loss
in D.C. supply is:
For reliable
protection of overhead transmission lines from direct lighting stroke using
ground wires, the protection angle ‘a’ between the vertical line through the
ground wire axis and the line passing from the ground wire axis to the outer
most line conductors should be ________.
Which of the following is an effect of non-uniform current distribution
in a conductor ?
Corona
discharge is generally __________ in colour :
Corona losses
in DC transmission is :
Corona effect
in transmission can be detected by
1. Hissing
sound
2. Faint
luminous glow which is blue in colour
3. Presence
of ozone which is detected by odours
Which of
these is/are correct?
For a
particular system corona loss at 60Hz is 1 kW/km per phase. What is the corona
loss at 50Hz in kW/km per phase ?
The skin
effect increases the (a)
The corona loss on a particular system at 50Hz is lkW/ph/km. What will
be the corona loss on the same system with the supply frequency 25 Hz ?
Self-inductance
of the conductor is one of the reasons for :
Corona loss
is less when the shape of the
Skin effect
results
Corona
results in
The power
transmitted will be maximum when
The current drawn by the line due to corona losses is
Corona is
likely to occur maximum in
___________ loss in transmission line is dependent on diameter of the
conductor.
Skin effect in a conductor becomes more pronounced ________.
Corona loss can be reduced by the use of hollow conductor, because
In the overhead system, the maximum disruptive stress exists between the
:
Which of the following is NOT related to transmission and distribution of electric power?
Skin effect depends on