The breakdown of insulation of the cable can be avoided economically by the use of
inter-sheaths
insulating materials with different dielectric constants
both (a) and (b)
none of the above
Q.5.
The electrostatic stress in underground cables is
same at the conductor and the sheath
minimum at the conductor and maximum at the sheath
maximum at the conductor and minimum at the sheath
zero at the conductor as well as on the sheath
Q.6.
If the length of a cable is doubled, its capacitance
becomes one-fourth
becomes one-half
becomes double
remains unchanged
Q.7.
The current carrying capacity of cables in D.C. is more thanthat in A.C. mainly due to
absence of harmonics
non-existence of any stability limit
smaller dielectric loss
absence of ripples
Q.8.
In case of three core flexible cable the colour of the neutral is
blue
black
brown
none of the above
Q.9.
Cables are used forkV lines.
High tension
Super tension
Extra high tension
Extra super voltage
Q.10.
Conduit pipes are normally used to protect _____ cables.
unsheathed cables
armoured
PVC sheathed cables
all of the above
Q.11.
In single core cables armouring is not done to
avoid excessive sheath losses
make it flexible
either of the above
none of the above
Q.12.
Dielectric strength of rubber is around
5 kV/mm
15 kV/mm
30 kV/mm
200 kV/mm
Q.13.
Low tension cables are generally used upto
200 V
500 V
700 V
1000 V
Q.14.
In a cable, the maximum stress under operating conditions is at
insulation layer
sheath
armour
conductor surface
Q.15.
High tension cables are generally used upto
11kV
33kV
66 kV
132 kV
Q.16.
High tension cables are generally used upto
11kV
33kV
66 kV
132 kV
Q.17.
The surge resistance of cable is
5 ohms
20 ohms
50 ohms
100 ohms
Q.18.
The surge resistance of cable is
5 ohms
20 ohms
50 ohms
100 ohms
Q.19.
In the cables, sheaths are used to
prevent the moisture from entering the cable
provide enough strength
provide proper insulation
none of the above
Q.20.
A certain cable has an insulation of relative permittivityIf the insulation is replaced by one of relative permittivitythe capacitance of the cable will become
one half
double
four times
none of the above
Q.21.
If a cable of homogeneous insulation has a maximum stress ofkV/mm, then thedielectric strength of insulation should be
5 kV/mm
10 kV/mm
15 kV/mm
30 kV/mm
Q.22.
In the cables, sheaths are used to
prevent the moisture from entering the cable
provide enough strength
provide proper insulation
none of the above
Q.23.
In cables the charging current
lags the voltage by 90°
leads the voltage by 90°
lags the voltage by 180°
leads the voltage by 180°
Q.24.
The intersheaths in the cables are used to
minimize the stress
avoid the requirement of good insulation
provide proper stress distribution
none of the above
Q.25.
The intersheaths in the cables are used to
minimize the stress
avoid the requirement of good insulation
provide proper stress distribution
none of the above
Support mcqgeeks.com by disabling your adblocker.
Please disable the adBlock and continue. Thank you.