Question is ⇒ High voltages for transmitting power is economically available from, Options are ⇒ (A) d.c. currents, (B) a.c. currents, (C) carrier currents, (D) none of the above, (E) , Leave your comments or Download question paper.

Question is ⇒ High voltages for transmitting power is economically available from, Options are ⇒ (A) d.c. currents, (B) a.c. currents, (C) carrier currents, (D) none of the above, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	High voltages for transmitting power is economically available from
A.	d.c. currents [Wrong Answer]
B.	a.c. currents [Correct Answer]
C.	carrier currents [Wrong Answer]
D.	none of the above [Wrong Answer]
View Answer 10 -1 Explanation:- Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ Which of the following is the source of heat generation in the cables ?
Dielectric losses in cable insulation
IR losses in the conductor
Losses in the metallic sheathings and armourings
All of the above

⇒ By which of the following factors is the sag of a transmission line least affected ?
Current through the conductor
Ice deposited on the conductor
Self weight of conductor
Temperature of surrounding air

⇒ The effect of ice on transmission line conductors is to increase the
transmission losses
weight of the conductor
tendency for corona
resistance to flow of current

⇒ For aluminium, as compared to copper, all the following factors have higher values except
specific volume
electrical conductivity
co-efficient of linear expansion
resistance per unit length for same cross-section

⇒ Which of the following equipment is used to limit short-circuit current level in a substation ?
Isolator
Lightning switch
Coupling capacitor
Series reactor

⇒ The angular displacementbetween two interconnected stations is mainly due to
armature reactance of both alternators
reactance of the interconnector
synchronous reactance of both the alternators
all of the above

⇒ The charging current in the cables
leads the voltage by 180°
leads the voltage by 90°
lags the voltage by 90°
lags the voltage by 180°

⇒ With which of the following are step-up substations associated ?
Concentrated load
Consumer location
Distributors
Generating stations

⇒ Which of the following are connected by the service mains ?
Transformer and earth
Distributor and relay system
Distributor and consumer terminals
Distributor and transformer

⇒ The conductors of the overhead lines are
solid
stranded
both solid and stranded
none of the above

⇒ Surge absorbers protect against ____ oscillations
high voltage high frequency
high voltage low frequency
low voltage high frequency
low voltage low frequency

⇒ The voltage regulation in magnetic amplifier type voltage regulator is effected by
electromagnetic induction
varying the resistance
varying the reactance
variable transformer

⇒ Floating neutral, in 3-phase supply, is undesirable because it causes
low voltage across the load
high voltage across the load
unequal line voltages across the load
none of the above

⇒ In which of the following voltage regulators the effect of dead zero is found ?
Electromagnetic type
Magnetic amplifier
Electronic type using integrated circuits
All of the above

⇒ A booser is connected in
parallel with earth connection
parallel with the feeder
series with the feeder
series with earth connection

⇒ The effective resistance of a conductor will be the same as 'ohmic resistance' when
power factor is unity
current is uniformly distributed in the conductor cross-section
voltage is low
current is in true sine wave form

⇒ By which of the following methods the protection against direct lightning strokes and high voltage sweep waves is provided ?
Lightening arresters
Ground wire
Lightening arresters and ground wires
Earthing of neutral

⇒ Skin effect exists only in
a.c. transmission
high voltage d.c. overhead transmission
low voltage d.c. overhead transmission
cables carrying d.c. current

⇒ On which of the following factors skin effect depends ?
Frequency of the current
Size of the conductor
Resistivity of the conductor material
All of the above

⇒ In transmission and distribution system the permissible voltage variation is
± 1 percent
± 10 percent
± 20 percent
± 30 percent

⇒ The electrostatic stress in underground cables is
zero at the conductor as well as on the sheath
same at the conductor and sheath
minimum at the condactor and minimum at the sheath
maximum at the conductor and minimum at the sheath

⇒ Constant voltage transmission entails the following disadvantage
large conductor area is required for same power transmission
short-circuit current of the system is increased
either of the above
none of the above

⇒ In a substation the following equipment is not installed
exciters
series capacitors
shunt reactors
voltage transformers

⇒ Pin type insulators are generally not used for voltages beyond
1 kV
11 kV
22 kV
33 kV

⇒ Basically the boosters are
synchronous motors
capacitors
inductors
transformers

⇒ Due to which of the following reasons aluminium is being favoured as busbar material ?
Low density
Low cost
Ease of fabrication
None of the above

⇒ Which of the following is the main advantage of A.C. transmission system over D.C. transmission system ?
Less instability problem
Less insulation problems
Easy transformation
Less losses in transmission over long distances

⇒ Ground wire is used to
avoid overloading
give the support to the tower
give good regulation
connect, a circuit conductor or other device to an earth-plate

⇒ Steepness of the travelling waves is alternated by ____ of the line
capacitance
inductance
resistance
all of the above

⇒ The limit of distance of transmission line may be increased by the use of
series resistances
shunt capacitors and series reactors
series capacitors and shunt reactors
synchronous condensers