Power System - I (3140914) MCQs

MCQs of Transmission Line Parameters

Showing 51 to 60 out of 103 Questions
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51.
An infinitely long straight conductor carries a uniform charge of q coulomb per meter length. If k is the permittivity of the medium wherein two points are located at distance D1 and D2 respectively from the conductor axis. The potential difference V12 (between two points) is given by
(a) V12 = (q/πk) ln(D2/D1)
(b) V12 = (q/πk) ln(D1/D2)
(c) V12 = (q/2πk) ln(D2/D1)
(d) V12 = (q/2πk) ln(D2/D1)
Answer:

Option (c)

52.
The capacitance Cab between conductor a and b separated by distance D and radius r is
(a) Cab = 0.0121/log(r/D) μF/km
(b) Cab = 0.0121/log(D/r) μF/km
(c) Cab = 0.0121log(D/r) μF/km
(d) Cab = 0.0121log(r/D) μF/km
Answer:

Option (b)

53.
The method of images originally suggested by Lord kelvin is used in
(a) Calculation of inductance
(b) Calculation of resistance
(c) Effect of earth on line capacitance
(d) None of above
Answer:

Option (c)

54.
Transmission line constants are
(a) Resistance
(b) Inductance
(c) Capacitance
(d) All of above
Answer:

Option (d)

55.
In transmission line, distributed constants are
(a) Resistance and shunt conductance only
(b) Resistance and inductance only
(c) Resistance, inductance and capacitance
(d) Resistance, inductance, capacitance and shunt conductance
Answer:

Option (d)

56.
Skin effect depends upon
(a) Cross section of conductor
(b) Supply frequency
(c) Permeability of conductor material
(d) All of above
Answer:

Option (d)

57.
Skin effect in transmission line is due to
(a) Supply frequency
(b) Self-inductance of conductor
(c) High sensitivity of  material in the center
(d) Both (a) and (b)
Answer:

Option (d)

58.
Effective resistance of a conductor will be same as ohmic resistance when
(a) Voltage is low
(b) Current is true sinusoidal
(c) Current is uniformly distributed in the cross section of conductor
(d) All of above
Answer:

Option (c)

59.
When alternating current flows through a conductor
(a) Entire current passes through the core of conductor
(b) Portion of conductor near the surface caries more current in comparison to the core
(c) Current remains uniformly distributed over the whole cross section of conductor
(d) Portion of conductor near the surface carries less current in comparison to the core
Answer:

Option (b)

60.
Conductor carries more current on the surface in comparison to its core, this phenomena is called
(a) Skin effect
(b) Corona
(c) Ferranti effect
(d) Lenz’s effect
Answer:

Option (a)

Showing 51 to 60 out of 103 Questions
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