Q41. | The purpose of using a booster is to | ||||||
A. | increase current [Wrong Answer] |
B. | reduce current [Wrong Answer] |
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C. | reduce voltage drop [Wrong Answer] |
D. | compensate for voltage drop [Correct Answer] |
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E. | none of the above [Wrong Answer] |
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Q42. | Which of the following can be used for bus-bars ? |
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A. | Tubes [Wrong Answer] |
B. | Rods [Wrong Answer] |
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C. | Bars [Wrong Answer] |
D. | Any of the above [Correct Answer] |
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Q43. | Conductors for high voltage transmission lines are suspended from towers to |
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A. | increase clearance from ground [Correct Answer] |
B. | reduce clearance from ground [Wrong Answer] |
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C. | take care of extension in length during summer [Wrong Answer] |
D. | reduce wind and snow loads [Wrong Answer] |
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E. | none of the above [Wrong Answer] |
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Q44. | The electrostatic stress in underground cables is |
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A. | zero at the conductor as well as on the sheath [Wrong Answer] |
B. | same at the conductor and sheath [Wrong Answer] |
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C. | minimum at the conductor and minimum at the sheath [Wrong Answer] |
D. | maximum at the conductor and minimum at the sheath [Correct Answer] |
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Q45. | The charging current in the cables | ||||||
A. | leads the voltage by 180° [Wrong Answer] |
B. | leads the voltage by 90° [Correct Answer] |
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C. | lags the voltage by 90° [Wrong Answer] |
D. | lags the voltage by 180° [Wrong Answer] |
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Q46. | The underground system cannot be operated above |
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A. | 440 V [Wrong Answer] |
B. | 11 kV [Wrong Answer] |
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C. | 33 kV [Wrong Answer] |
D. | 66 kV [Correct Answer] |
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Q47. | Which of the following is the source of heat generation in the cables ? |
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A. | Dielectric losses in cable insulation [Wrong Answer] |
B. | IR losses in the conductor [Wrong Answer] |
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C. | Losses in the metallic sheathings and armourings [Wrong Answer] |
D. | All of the above [Correct Answer] |
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Q48. | The distributors for residential areas are |
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A. | single phase [Wrong Answer] |
B. | three-phase three wire [Wrong Answer] |
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C. | three-phase four wire [Correct Answer] |
D. | none of the above [Wrong Answer] |
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Q49. | In transmission lines the cross-arms are made of |
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A. | copper [Wrong Answer] |
B. | wood [Wrong Answer] |
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C. | R.C.C. [Wrong Answer] |
D. | steel [Correct Answer] |
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Q50. | Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased 100 percent, saving in copper is |
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A. | 25 percent [Wrong Answer] |
B. | 50 percent [Correct Answer] |
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C. | 75 percent [Wrong Answer] |
D. | 100 percent [Wrong Answer] |
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