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Electrical Engineering
D.C. Generators
Quiz 5
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Q.1
Which of the following generating machine will offer constant voltage on all loads?
Self-excited generator
Separately excited generator
Level compounded generator
All of the above
Q.2
The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be
640 V
620 V
600 V
580 V
Q.3
Shunt generators are most suited for stable parallel operation because of their
rising voltage characteristics
identical voltage characteristics
drooping voltage characteristics
linear voltage characteristics
Q.4
Permeance is the reciprocal of
Flux density
Reluctance
Ampere turns
Resistance
Q.5
The number of brushes in a commutator depends on
Speed of armature
Type of winding
Voltage
Amount of current to be collected
Q.6
The minimum dielectric stress in a cable is at
armour
bedding
conductor surface
lead sheath
Q.7
What is Superman's birth name?
nal-el
kal-el
mal-el
dal-el
Q.8
Cables, generally used beyondkV are
oil filled
S.L. type
belted
armoured
Q.9
The metallic sheath may be made of lead or lead alloy or of aluminium.
Yes
No
none
none
Q.10
Polyethylene has very poor dielectric and ageing properties.
Yes
No
none
none
Q.11
Rubber is most commonly used insulation in cables.
Yes
No
none
none
Q.12
Rubber is most commonly used insulation in cables.
Yes
No
none
none
Q.13
Natural rubber is obtained from milky sap of tropical trees.
Yes
No
none
none
Q.14
Natural rubber is obtained from milky sap of tropical trees.
Yes
No
none
none
Q.15
In congested areas where excavation is expensive and inconvenient 'draw in system'of laying of underground cables is often adopted.
Yes
No
none
none
Q.16
In congested areas where excavation is expensive and inconvenient 'draw in system'of laying of underground cables is often adopted.
Yes
No
none
none
Q.17
In capacitance grading a homogeneous dielectric is used.
Yes
No
none
none
Q.18
In capacitance grading a homogeneous dielectric is used.
Yes
No
none
none
Q.19
The advantage of oil filled cables is
more perfect impregnation
smaller overall size
no ionisation, oxidation and formation of voids
all of the above
Q.20
The advantage of oil filled cables is
more perfect impregnation
smaller overall size
no ionisation, oxidation and formation of voids
all of the above
Q.21
The insulating material should have
low permittivity
high resistivity
high dielectric strength
all of the above
Q.22
The insulating material should have
low permittivity
high resistivity
high dielectric strength
all of the above
Q.23
Copper as conductor for cables is used as
annealed
hardened and tempered
hard drawn
alloy with chromium
Q.24
If a power cable and a communication cable are to run parallel the minimum distancebetween the two, to avoid interference, should be
2 cm
10 cm
50 cm
400 cm
Q.25
Is a cable is to be designed for use onkV, which insulation would you prefer ?
Polyvinyle chloride
Vulcanised rubber
Impregnated paper
Compressed SFe gas
Q.26
Cables forkV lines are invariably
mica insulated
paper insulated
compressed oil or compressed gas insulated
rubber insulated
Q.27
The thickness of metallic shielding on cables is usually
0.04 mm
0.2 to 0.4 mm
3 to 5 mm
40 to 60 mm
Q.28
Underground cables are laid at sufficient depth
to minimise temperature stresses
to avoid being unearthed easily due to removal of soil
to minimise the effect of shocks and vibrations due to gassing vehicles, et
for all of the above reasons
Q.29
Capacitance grading of cable implies
use of dielectrics of different permeabilities
grading according to capacitance of cables per km length
cables using single dielectric in different concentrations
capacitance required to be introduced at different lengths to counter the effect of inductance
Q.30
In a cable the voltage stress is maximum at
sheath
insulator
surface of the conductor
core of the conductor
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