Q.1
Which of the following generating machine will offer constant voltage on all loads?
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
Q.3
Shunt generators are most suited for stable parallel operation because of their
Q.4
Permeance is the reciprocal of
Q.5
The number of brushes in a commutator depends on
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
0 h : 0 m : 1 s