Question is ⇒ The electrostatic stress in underground cables is, Options are ⇒ (A) zero at the conductor as well as on the sheath, (B) same at the conductor and sheath, (C) minimum at the condactor and minimum at the sheath, (D) maximum at the conductor and minimum at the sheath, (E) , Leave your comments or Download question paper.

Question is ⇒ The electrostatic stress in underground cables is, Options are ⇒ (A) zero at the conductor as well as on the sheath, (B) same at the conductor and sheath, (C) minimum at the condactor and minimum at the sheath, (D) maximum at the conductor and minimum at the sheath, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	The electrostatic stress in underground cables is
A.	zero at the conductor as well as on the sheath [Wrong Answer]
B.	same at the conductor and sheath [Wrong Answer]
C.	minimum at the condactor and minimum at the sheath [Wrong Answer]
D.	maximum at the conductor and minimum at the sheath [Correct Answer]
View Answer 19 -6 Explanation:- Answer : D 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 :

⇒ 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

⇒ 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

⇒ Poles which carry transformers are usually
circular
I-type
A-type
H-type

⇒ The cause of damage to the lead sheath of a cable is
crystallisation of the lead through vibration
chemical action on the lead when buried in the earth
mechanical damage
all of the above

⇒ 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

⇒ Overhead system can be designed for operation upto
11 kV
33 kV
66 kV
400 kV

⇒ The top most conductor in a high transmission line is
earth conductor
R-phase conductor
Y-phase conductor
B-phase conductor

⇒ Which of the following is neglected in the analysis of short transmission lines ?
Series impedance
Shunt admittance
I²R loss
None 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

⇒ 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

⇒ Transmission line insulators are made of
glass
porcelain
iron
P.V.C.

⇒ 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 bus-bar schemes has the lowest cost ?
Ring bus-bar scheme
Single bus-bar scheme
Breaker and a half scheme
Main and transfer scheme

⇒ A feeder, in a transmission system, feeds power to
distributors
generating stations
service mains
all of the above

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

⇒ The effect of wind pressure is more predominant on
supporting towers
neutral wires
transmission lines
insulators

⇒ In which of the following cases shunt capacitance is negligible ?
Short transmission lines
Medium transmission lines
Long transmission lines
All transmission lines

⇒ 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

⇒ Which of the following equipment should be installed by the consumers having low power factor ?
Synchronous condensers
Capacitor bank
Tap changing transformer
Any of the above

⇒ In A.C.S.R. conductors, the insulation between aluminium and steel conductors is
insulin
bitumen
varnish
no insulation is required

⇒ 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 characteristics should the line supports for transmission lines possess ?
Low cost
High mechanical strength
Longer life
All of the above

⇒ For transmission of power over a distance of 500 km, the transmission voltage should be in the range
150 to 220 kV
100 to 120 kV
60 to 100 kV
20 to 50 kV

⇒ Earthing is necessary to give protection against
danger of electric shock
voltage fluctuation
overloading
high temperature of the conductors

⇒ Which of the following are the constants of the transmission lines ?
Resistance
Inductance
Capacitance
All of the above

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

⇒ The operating voltage of supertension cables is upto
3.3 kV
6.6 kV
11 kV
33 kV

⇒ The size of the earth wire is determined by
the atmospheric conditions
the voltage of the service wires
the ampere capacity of the service wires
none of the above

⇒ In a distribution system major cost is that of
earthing system
distribution transformer
conductors
meters

⇒ The material generally used for armour of high voltage cables is
aluminium
steel
brass
copper