Question is ⇒ The area of cross-section of the neutral in a 3-wire D.C. system is generally ____ the area of cross-section of main conductor, Options are ⇒ (A) same as, (B) one-fourth, (C) one half, (D) double, (E) , Leave your comments or Download question paper.

Question is ⇒ The area of cross-section of the neutral in a 3-wire D.C. system is generally ____ the area of cross-section of main conductor, Options are ⇒ (A) same as, (B) one-fourth, (C) one half, (D) double, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	The area of cross-section of the neutral in a 3-wire D.C. system is generally ____ the area of cross-section of main conductor
A.	same as [Wrong Answer]
B.	one-fourth [Wrong Answer]
C.	one half [Correct Answer]
D.	double [Wrong Answer]
View Answer 19 -18 Explanation:- Answer : C 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 :

⇒ The minimum clearance between the ground and a 220 kV line is about
4.3 m
5.5 m
7.0 m
10.5 m

⇒ In a D.C. 3-wire distribution system, balancer fields are cross-connected in order to
boost the generated voltage
balance loads on both sides of the neutral
make both machines run as unloaded motors
equalize voltages on the positive and negative outers

⇒ As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only
31.25 percent of copper
33.3 percent of copper
66.7 percent of copper
125 percent of copper

⇒ A conductor due to sag between two supports, takes the form of
semi-circle
triangle
ellipse
catenary

⇒ 310 km line is considered as
a long line
a medium line
a short line
any of the above

⇒ By which of the following methods string efficiency can be improved ?
Using a guard ring
Grading the insulator
Using long cross arm
Any of the above

⇒ As compared to cables, the disadvantage of transmission lines is
inductive interference between power and communication circuits
exposure to lightning
exposure to atmospheric hazards like smoke, ice, etc.
all of the above

⇒ The surge resistance of cables is
20 ohms
50 ohms
200 ohms
300 ohms

⇒ If the height of transmission tower is increased, which of the following; parameters is likely to change ?
Capacitance
Inductance
Resistance
All of the above

⇒ Which of the following distribution systems is the most economical ?
A.C. 1-phase system
A.C. 3-phase 3 wire system
A.C. 3-phase 4 wire system
Direct current system

⇒ The skin effect of a conductor will reduce as the
resistivity of conductor material increases
permeability of conductor material increases
diameter increases
frequency increases

⇒ Conductors for high voltage transmission lines are suspended from towers to
increase clearance from ground
reduce clearance from ground
take care of extension in length during summer
reduce wind and snow loads

⇒ Which of the following regulations is considered best ?
0.5
0.2
0.1
0.02

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

⇒ 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

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

⇒ If string efficiency is 100 percent it means that
potential across each disc is zero
potential across each disc is same
one of the insulator discs is shorted
none of the above

⇒ A circuit is disconnected by isolators when
line is energized
there is no current in the line
line is on full load
circuit breaker is not open

⇒ In the cables sheaths are used to
prevent the moisture from entering the cable
provide strength to the cable
provide proper insulation
none of the above

⇒ Power loss due to corona is not directly proportional to
spacing between conductors
supply voltage frequency
phase-neutral voltage
all of the above

⇒ High voltages for transmitting power is economically available from
d.c. currents
a.c. currents
carrier currents
none of the above

⇒ Series capacitors on transmission lines are of little use when the load VAR requirement is
large
small
fluctuating
any of the above

⇒ The conductors are bundled primarily to
increase reactance
reduce reactance
reduce radio interference
none of the above

⇒ A.C.S.R. conductor having 7 steel stands surrounded by 25 aluminium conductors will be specified as
25/7
50/15
7/25
15/50

⇒ The corona is considerably affected by which of the following ?
Size of the conductor
Shape of the conductor
Surface condition of the conductor
All of the above

⇒ When the interconnector between two stations has large reactance
the transfer of power will take place with voltage fluctuation and noise
the transfer of power will take place with least loss
the stations will fall out of step because oflarge angular displacement, between the stations
none of the above

⇒ High voltage transmission lines use
suspension insulators
pin insulators
both (a) and (b)
none of the above

⇒ To increase the capacity of a transmission line for transmitting power which of the following must be decreased ?
Capacitance
Line inductance
Voltage
All of the above

⇒ The operating voltage of high voltage cable's is upto
1.1 kV
3.3 kV
6.6 kV
11 kV

⇒ Electro-mechanical voltage regulators are generally used in
reactors
generators
transformers
all of the above