Electrical Engineering Practice Impotent Questions Part 8
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83-The characteristic impedance of a transmission line depends upon
(A) Shape of the conductor
(B) Surface treatment of the conductors
(C) Conductivity of the material
(D) Geometrical configuration of the conductors.
Ans: (D) Geometrical configuration of the conductors.
84-A Short transmission line has equivalent circuit consisting of:
A. Series inductance L and shunt capacitance G
B. Series resistance R and shunt capacitance G
C. Series resistance R and shunt capacitance C
D. Series resistance R and series inductance L
Ans: D. Series resistance R and series inductance L
85-Shunt capacitance is usually neglected in the analysis of
(A) Short transmission lines
(B) Medium transmission lines
(C) Long transmission lines
(D) Medium as well as long transmission lines.
Ans: (A) Short transmission lines
86-Superheatedsteamisalways
(A) At a temperature higher than the saturation temperature corresponding to a
Steam pressure
(B) At a pressure more than the boiler steam pressure
(C) Separated from water particles before being supplied to turbine
(D) At a pressure less than the maximum cycle pressure.
Ans: (A) At a temperature higher than the saturation temperature corresponding to a Steam pressure
87-Transmission lines link
(A) Service points to consumer premises
(B) Distribution transformer to consumer premises
(C) Receiving end station to distribution transformer
(D) Generating station to receiving end station.
Ans: (D) Generating station to receiving end station.
88-A load curve is a plot of
(A) Load versus generation capacity
(B) Load versus current
(C) Load versus time
(D) Load versus cost of power.
Ans: (C) Load versus time
89-As compared to steam at entry to the turbine, which of the following will be larger at exit?
(A) Pressure
(B) Flowrate
(C) Specific volume
(D) Specific enthalpy.
Ans: (C) Specific volume
90-Total load transmitted through a 3 phase transmission line is 10,000 kW at 0.8 power factor lagging. The I2R losses are 900 kW. The efficiency of transmission line is
(A) 60 %
(B) 90 %
(C) 95 %
(D) 99 % .
Ans: (B) 90 %
91-In high voltage transmission lines the top most conductor is
(A) R-phase conductor
(B) Y – phase conductor
(C) B-phase conductor
(D) Earth conductor.
Ans: (D) Earth conductor.
92- which of the following is used to edit a chart in MS excel
A. drag the chart
B. right click on the chart
C. left click on the chart
D. double click on the chart
Ans: D. double click on the chart