Transmission And Distribution MCQ

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• Which of the following faults is most likely to occur in cables?
  ক

  Cross or short-circuit fault

  খ

  Open circuit fault

  গ

  Breakdown of cable insulation

  ঘ

  All of the above
• Which of the following is the source of heat generation in the cables?
  ক

  Dielectric losses in cable insulation

  খ

  losses in the conductor

  গ

  Losses in the metallic sheathings and armourings

  ঘ

  All of the above
• Besides a method of trial and error, which of the following methods is employed for solution of network problems in interconnected system?
  ক

  Circulating current method

  খ

  Thevenin's theorem

  গ

  Superposition of currents

  ঘ

  All of the above
• If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as
  ক

  Kelvin's law

  খ

  Ohm's law

  গ

  Kirchhoff's law

  ঘ

  Faraday's law
• The operating voltage of high voltage cables is up to
  ক

  l.lkV

  খ

  3.3kV

  গ

  6.6kV

  ঘ

  llkV
• Skin effect is proportional to
  ক

  $${\left( {{\text{conductor diameter}}} \right)^{\frac{1}{2}}}$$

  খ

  (conductor diameter)⁴

  গ

  (conductor diameter)²

  ঘ

  (conductor diameter)³

  ঙ

  none of the above
• Transmission line insulators are made of
  ক

  glass

  খ

  porcelain

  গ

  iron

  ঘ

  P.V.C.
• A feeder, in a transmission system, feeds power to
  ক

  Distributors

  খ

  Generating stations

  গ

  Service mains

  ঘ

  All of the above
• Which of the following characteristics should the line supports for transmission lines possess?
  ক

  Low cost

  খ

  High mechanical strength

  গ

  Longer life

  ঘ

  All of the above
• On which of the following factors skin effect depends?
  ক

  Frequency of the current

  খ

  Size of the conductor

  গ

  Resistivity of the conductor material

  ঘ

  All of the above
• The operating voltage of super-tension cables is up to
  ক

  3.3 kV

  খ

  6.6 kV

  গ

  11 kV

  ঘ

  33 kV
• The cause of damage to the lead sheath of a cable is
  ক

  crystallisation of the lead through vibration

  খ

  chemical action on the lead when buried in the earth

  গ

  mechanical damage

  ঘ

  all of the above
• A conductor, due to sag between two supports, takes the form of
  ক

  Semicircle

  খ

  Triangle

  গ

  Ellipse

  ঘ

  Catenary
• The following system is not generally used
  ক

  1-phase 3-wire

  খ

  1-phase 4-wire

  গ

  3-phase 3-wire

  ঘ

  3-phase 4-wire
• The presence of ozone due to corona is harmful because it
  ক

  Reduces power factor

  খ

  Corrodes the material

  গ

  Gives odour

  ঘ

  Transfer energy to the ground
• Electromechanical voltage regulators are generally used in
  ক

  Reactors

  খ

  Generators

  গ

  Transformers

  ঘ

  All of the above
• Which of the following is the demerit of a 'constant voltage transmission system'?
  ক

  Increase of short-circuit current of the system

  খ

  Availability of steady voltage at all loads at the line terminals

  গ

  Possibility of better protection for the line due to possible use of higher terminal reactants

  ঘ

  Improvement of power factor at times of moderate and heavy loads
• The skin effect of a conductor will reduce as the
  ক

  Resistivity of conductor material increases

  খ

  Permeability of conductor material increases

  গ

  Diameter increases

  ঘ

  Frequency increases
• The spacing between phase conductors of a 220 kV line is approximately equal to
  ক

  2 m

  খ

  3.5 m

  গ

  6 m

  ঘ

  8.5 m
• Owing to skin effect
  ক

  Current flows through the half cross-section of the conductor

  খ

  Portion of the conductor near the surface carries more current and core of the conductor carries less current

  গ

  Portion of the conductor near the surface carries less current and core of the conductor carries more current

  ঘ

  Any of the above
• Which of the following D.C. distribution system is the simplest and lowest in first cost?
  ক

  Radial system

  খ

  Ring system

  গ

  Interconnected system

  ঘ

  None of the above
• For transmission of power over a distance of 500 km, the transmission voltage should be in the range
  ক

  150 to 220 kV

  খ

  100 to 120 kV

  গ

  60 to 100 kV

  ঘ

  20 to 50 kV
• The underground system cannot be operated above
  ক

  440 V

  খ

  11 V

  গ

  33 V

  ঘ

  66 V
• In transmission lines the cross-arms are made of
  ক

  Copper

  খ

  Wood

  গ

  R.C.C.

  ঘ

  Steel
• Which of the following is not a constituent for making porcelain insulators?
  ক

  Quartz

  খ

  Kaolin

  গ

  Felspar

  ঘ

  Silica
• The angular displacement between two interconnected stations is mainly due to
  ক

  Armature reactance of both alternators

  খ

  Reactance of the interconnector

  গ

  Synchronous reactance of both the alternators

  ঘ

  All of the above
• In a D.C. 3-wire distribution system, balancer fields are cross-connected in order to
  ক

  boost the generated voltage

  খ

  balance loads on both sides of the neutral

  গ

  make both machine^ run as unloaded motors

  ঘ

  equalize voltages on the positive and negative outers
• The steel used in steel cored conductors is usually
  ক

  Alloy steel

  খ

  Stainless steel

  গ

  Mild steel

  ঘ

  High speed steel
• For transmission of power over a distance of 200 km, the transmission voltage should be
  ক

  132 kV

  খ

  66 kV

  গ

  33 kV

  ঘ

  11 kV
• Which of the following materials is not used for transmission and distribution of electrical power?
  ক

  Copper

  খ

  Aluminium

  গ

  Steel

  ঘ

  Tungsten