# Multiple Choice Question (MCQ) of Power Systems page-3

32. The graded cables used the dielectric of different

a) permittivities
b) permeabilities
c) (a) and (b) both
d) (a) or (b)

Ans: (a)

33. The charging current in the cables

a) Lags the voltage by 90°
b) Leads the voltage by 90°
c) Leads the voltage by 180°
d) Lags the voltage by 45°

Ans: (b)

34. The dielectric losses increase with the increase of temperature

a) true
b) false

Ans: (a)

35. If A, B, C and D are the constants of the medium transmission line, which of the following relation is correct ?

a) AB – CD = - 1
b) AD + BD = 1
c) BC – AD = - 1
d) AC – BD = 1

Ans: (c)

36. What is the unit of constant D?

a) ohm
b) mho
c) henry
d) none of the above

Ans: (d)

37. While finding out the relation between VS and VR capacitance is neglected in

a) A short transmission line
b) A long transmission line
c) A medium transmission line
d) All the above cases

Ans: (a)

38. The capacitance in the medium transmission line is

a) Lumped
b) Distributed over the entire length of line
c) (a) or (b) depending on the transmission voltage
d) Variable non-linearity over line

Ans: (b)

39. The surge impedance of the underground cable is more than the surge impedance of the overhead transmission line.

a) true
b) false

Ans: (b)

40. The surge impedance for an underground cable is

a) 60 to 100 ohms
b) 40 to 60 ohms
c) 40 to 600 ohms
d) 30 to 75 ohms

Ans: (b)

41. The surge impedance of the long transmission line is given by

a) Zc = √(L/C)
b) Zc =√(Z/Y)
c) Zc =√(Y/Z)
d) Zc =√(R/Y)

Ans: (b)

42. The surge impedance cannot be determined in the terms of A, B, C and D constants of the line.

a) true
b) false

Ans: (b)

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