Index

SymbolsTransformerRelayPower-SystemBasic-electricalACSR-ConductorCircuit-BreakerInterview-questions-of-Basic-ElectricityInterview-questions-of-transformerInsulatorCurrent-TransformerMCQMCQ-powersystemThermal-power-stationInterview-questions-of-Power-SystemPower-ElectronicsInterview-questions-of-Underground-CableInterview-questions-of-IlluminationIlluminationMCQ-of-ElectronicsMCQ-of-Basic-ElectricalMCQ-of-Transformers MCQ-of-D.C-motor MCQ-of-D.C-generatorsMCQ-Control-SystemMCQ-Measurementsmcq-of-Generation-power-systemMCQ-of-Induction-MotorMCQ-of-Transmission-DistributionMCQ-of-Electrical-MachinesMCQ-of-Alternator-and-Synchronous-MotorsMCQ-Electric-PowerMCQ-Illumination

Objective Questions & Answers of Circuit Breaker page-4


≪ Previous Next ≫

31. The acting contacts for a circuit breakers are made of

A) Stainless steel
B) Hard pressed carbon
C) Copper tungsten alloy
D) Porcelain.

Ans : (C)

32. In a circuit breaker the active recovery voltage depends upon

A) power factor
B) armature reaction
C) circuit conditions
D) all of the above.

Ans : (D)

33. The transient voltage that appears across the contacts at the instant of arc extinction is called

A) peak voltage
B) supply voltage
C) restriking voltage
D) recovery voltage.

Ans : (C)

34. Ionization in a circuit breaker is not facilitated by

A) material of contacts
B) high temperature of surrounding medium
C) increase of mean free path
D) increase of field strength.

Ans : (A)

35. Sulphur hexafluoride is a

A) Conductor of electricity
B) Dielectric
C) Semi-conductor
D) Inactive gas.

Ans : (B)

36. The contact resistance is least affected by

A) the ambient temperature
B) the amount of surface contamination
C) the shape of the contact faces
D) the mechanical force applied.

Ans : (A)

37. Which circuit breaker is generally used in railway traction ?

A) Minimum oil circuit breaker
B) Vacuum circuit breaker
C) Air break circuit breaker
D) SF6 gas circuit breaker.

Ans : (C)

38. A fuse wire should have

A) Low specific resistance and low melting point
B) Low specific resistance and high melting point
C) High specific resistance and low melting point
D) High specific resistance and high melting point.

Ans : (A)

39. Fuse wire protection system is usually not used beyond

A) 10 A
B) 25 A
C) 50 A
D) 100 A.

Ans : (D)

40. The arc voltage produced in ac circuit breaker is

A) Leading the arc current by 90o
B) Lagging the arc current by 90o
C) In phase with the arc current
D) In phase opposition to the arc current.

Ans : (C)


≪ Previous Next ≫


Related topics :

  1. Objective Type Question or MCQ of Power System Protection page-1
  2. Objective Type Question or MCQ of Power System Protection page-2
  3. Objective Type Question or MCQ of Power System Protection page-3
  4. Objective Type Question or MCQ of Power System Protection page-4
  5. Objective Type Question or MCQ of Power System Protection page-5
  6. Objective Type Question or MCQ of Power System Protection page-6
  7. Objective Type Question or MCQ of Power System Protection page-7
  8. Objective Type Question or MCQ of Power System Protection page-8
  9. Objective Type Question or MCQ of B. Economics of Operation page-1
  10. Objective Type Question or MCQ of B. Economics of Operation page-2
  11. Objective Type Question or MCQ of B. Economics of Operation page-3
  12. Objective Type Question or MCQ of B. Economics of Operation page-4
  13. Objective Type Question or MCQ of B. Economics of Operation page-5
  14. Objective Type Question or MCQ of B. Economics of Operation page-6
  15. Multiple Choice Question (MCQ) of Circuit Breaker page-1
  16. Multiple Choice Question (MCQ) of Circuit Breaker page-2
  17. Multiple Choice Question (MCQ) of Circuit Breaker page-3
  18. Multiple Choice Question (MCQ) of Fuse
  19. Multiple Choice Question (MCQ) of Protective Relays page-1
  20. Multiple Choice Question (MCQ) of Protective Relays page-2
  21. Multiple Choice Question (MCQ) of Protective Relays page-3
  22. Multiple Choice Question (MCQ) of Protective Relays page-4
  23. Multiple Choice Question (MCQ) of battery page-2
  24. Multiple Choice Question (MCQ) of battery page-3
  25. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-1
  26. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-2
  27. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-3
  28. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-4
  29. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-5
  30. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-6
  31. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-7
  32. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-8
  33. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-9
  34. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-10
  35. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-11
  36. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-12
  37. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-13
  38. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-14
  39. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-15
  40. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-16
  41. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-17
  42. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-18
  43. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-19
  44. Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-20
  45. Multiple Choice Question (MCQ) of battery page-1
  46. Multiple Choice Question (MCQ) of Battery page-4
  47. Multiple Choice Question (MCQ) of Battery page-5
  48. Multiple Choice Question (MCQ) of Battery page-6
  49. Multiple Choice Question (MCQ) of Battery page-7
  50. Multiple Choice Question (MCQ) of Battery page-8
  51. Multiple Choice Question (MCQ) of Battery page-9
  52. Multiple Choice Question (MCQ) of Battery page-10
  53. Multiple Choice Question (MCQ) of Battery page-11
  54. Multiple Choice Question (MCQ) of Battery page-12
  55. Multiple Choice Question (MCQ) of Battery page-13
  56. Multiple Choice Question (MCQ) of battery page-14
  57. Multiple Choice Question (MCQ) of Battery page-15
  58. Multiple Choice Question (MCQ) of Battery page-16
  59. Multiple Choice Question (MCQ) of Battery page-17
  60. Multiple Choice Question (MCQ) of Battery page-18
  61. Multiple Choice Question (MCQ) of Battery page-19
  62. Objective Questions & Answers of Circuit Breaker page - 1
  63. Objective Questions & Answers of Circuit Breaker page-2
  64. Objective Questions & Answers of Circuit Breaker page-3
  65. Objective Questions & Answers of Circuit Breaker page-4
  66. Objective Questions & Answers of Circuit Breaker page-5
  67. Objective Questions & Answers of Circuit Breaker page-6
  68. Objective Questions & Answers of Circuit Breaker page-7
  69. Objective Questions & Answers of Circuit Breaker page-8
  70. Objective Questions & Answers of Circuit Breaker page-9
  71. Objective Questions & Answers of Circuit Breaker page-10
  72. Objective Questions & Answers of Circuit Breaker page-11
  73. Objective Questions & Answers of Circuit Breaker page-12
  74. Objective Questions & Answers of Circuit Breaker page-13
  75. Multiple Choice Question (MCQ) of Materials page-1
  76. Multiple Choice Question (MCQ) of Materials page-2
  77. Multiple Choice Question (MCQ) of Materials page-3
  78. Multiple Choice Question (MCQ) of Materials page-4
  79. Multiple Choice Question (MCQ) of Materials page-5
  80. Multiple Choice Question (MCQ) of Materials page-6
  81. Multiple Choice Question (MCQ) of Materials page-7
  82. Multiple Choice Question (MCQ) of Materials page-8
  83. Multiple Choice Question (MCQ) of Materials page-9
  84. Multiple Choice Question (MCQ) of Materials page-10
  85. Multiple Choice Question (MCQ) of Materials page-11
  86. Multiple Choice Question (MCQ) of Materials page-12
  87. Multiple Choice Question (MCQ) of Materials page-13
  88. Multiple Choice Question (MCQ) of Materials page-14
  89. Multiple Choice Question (MCQ) of Materials page-15
  90. Multiple Choice Question (MCQ) of Materials page-16
  91. Multiple Choice Question (MCQ) of Materials page-17
  92. Multiple Choice Question (MCQ) of Materials page-18
  93. Multiple Choice Question (MCQ) of Materials page-19
  94. Multiple Choice Question (MCQ) of Materials page-20
  95. Multiple Choice Question (MCQ) of Materials page-21
  96. Multiple Choice Question (MCQ) of Materials page-22
  97. Multiple Choice Question (MCQ) of Materials page-23
  98. Multiple Choice Question (MCQ) of Materials page-24
  99. Multiple Choice Question (MCQ) of Materials page-25
  100. Multiple Choice Question (MCQ) of Materials page-26
  101. Multiple Choice Question (MCQ) of Materials page-27
  102. Multiple Choice Question (MCQ) of Materials page-28
  103. Multiple Choice Question (MCQ) of Materials page-29
  104. Multiple Choice Question (MCQ) of Materials page-30
  105. Multiple Choice Question (MCQ) of Materials page-31
  106. Multiple Choice Question (MCQ) of Materials page-32
  107. Multiple Choice Question (MCQ) of Materials page-33
  108. Multiple Choice Question (MCQ) of Materials page-34
  109. Multiple Choice Question (MCQ) of Materials page-35