Transmission And Distribution MCQ

Test your knowledge with important Transmission And Distribution MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Transmission And Distribution MCQs on Bissoy. Bissoy App

• 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
• 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
• 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
• 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
• The steel used in steel cored conductors is usually
  ক

  Alloy steel

  খ

  Stainless steel

  গ

  Mild steel

  ঘ

  High speed steel
• Which of the following materials is not used for transmission and distribution of electrical power?
  ক

  Copper

  খ

  Aluminium

  গ

  Steel

  ঘ

  Tungsten
• When a conductor carries more current on the surface as compared to core, it is due to
  ক

  Permeability variation

  খ

  Corona

  গ

  Skin effect

  ঘ

  Unsymmetrical fault
• The operating voltage of extra high tension cables is upto
  ক

  6.6 kV

  খ

  11 kV

  গ

  33 kV

  ঘ

  66 kV
• The voltage drop, for constant voltage transmission is compensated by installing
  ক

  Inductors

  খ

  Capacitors

  গ

  Synchronous motors

  ঘ

  All of above
• For which of the following equipment current rating is not necessary?
  ক

  Circuit breakers

  খ

  Isolators

  গ

  Load break switch

  ঘ

  Circuit breakers and load break switches
• The material commonly used for sheaths of underground cables is
  ক

  Lead

  খ

  Rubber

  গ

  Copper

  ঘ

  Iron