transmission and distribution MCQs – Page 3

Practise focused transmission and distribution questions with marked answers for exam preparation and subject revision.

transmission and distribution Mcqs

41. High voltage transmission lines use__________________?
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A. suspension insulators

B. pin insulators

C. both A. and B.

D. none of the above

42. On which of the following factors skin effect depends?
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A. Resistivity of the conductor material

B. All of the above

C. Size of the conductor

D. Frequency of the current

43. The steel used in steel cored conductors is usually__________?
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A. mild steel

B. alloy steel

C. stainless steel

D. all of the above

E. high speed steel

44. The operating voltage of extra high tension cables is upto_______________?
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A. 33 kV

B. 66 kV

C. 6.6 kV

D. 11 kV

E. 132 kV

45. The spacing between phase conductors of a 220 kV line is approximately equal to________________?
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A. 8.5 m

B. 2 m

C. 6 m

D. 3.5 m

46. A uniformly-loaded D.C. distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is______________?
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A. one-third

B. one-half

C. none of the above

D. twice

E. one-fourth

47. The distributors for residential areas are______________?
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A. three-phase three wire

B. single phase

C. three-phase four wire

D. none of the above

48. For transmission of power over a distance of 200 km, the transmission voltage should be_________kv?
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A. 132 kV

B. 11 kV

C. 33 kV

D. 66 kV

49. When a conductor carries more current on the surface as compared to core, it is due to___________?
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A. corona

B. permeability variation

C. skin effect

D. none of the above

E. unsymmetrical fault

50. For which of the following equipment current rating is not necessary?
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A. Circuit breakers

B. Isolators

C. Load break switch

D. Circuit breakers and load break switches

51. A 3-phase 4 wire system is commonly used on________________?
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A. secondary distribution

B. secondary transmission

C. primary distribution

D. primary transmission

52. In transmission lines the cross-arms are made of________________?
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A. wood

B. copper

C. R.C.C.

D. steel

53. Constant voltage transmission entails the following disadvantage?
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A. large conductor area is required for same power transmission

B. none of the above

C. short-circuit current of the system is increased

D. either of the above

54. The presence of ozone due to corona is harmful because it________________?
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A. none of the above

B. transfer energy to the ground

C. gives odour

D. corrodes the material

E. reduces power factor

55. In a tap changing transformer, the tappings are provided on__________?
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A. primary winding

B. any of the above

C. secondary winding

D. high voltage winding

56. When an alternator connected to the bus-bar is shut down the bus-bar voltage will___________?
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A. none of the above

B. rise

C. fall

D. remain unchanged

57. The wooden poles well impregnated with creosite oil or any preservative compound have life_____________?
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A. from 2 to 5 years

B. 60 to 70 years

C. 25 to 30 years

D. 10 to 15 years

58. jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?
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A. 22 kV (maximum value)/cm

B. 6.6 kV (r.m.s. value)/cm

C. 30 kV (maximum value)/cm

D. 11 kV (r.m.s. value)/cm

59. A booster is a_________________?
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A. series wound generator

B. shunt wound generator

C. synchronous generator

D. none of the above

60. The square root of the ratio of line impedance and shunt admittance is called the___________?
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A. regulation of the line

B. none of the above

C. conductance of the line

D. surge impedance of the line

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