# Power Systems - II Mid - I, September - 2014

###### 1.Bundle conductors in the EHV transmission line provide
• Increased line reactance
• reduced line capacitance
• reduced voltage gradient
• increased corona losses
Answer: C
• 1 , Z, 0, 1
• 0, 1, 1,1
• Z, 0, 1, 1
• 1, 1, Z, 0
Answer: A
###### 3.If the receiving end voltage and the currents are numerically equal to the corresponding sending end values, then such a line is called
• infinite line
• natural line
• Tuned line
• losses line
Answer: A
###### 4.In which of the following model of the transmission line full charging current is assumed to flow over half the length of the line
• equivalent pi
• short line
• nominal pi
• nominal T
Answer: D
• insulators
• conductors
• poles
• jumpers
Answer: B
• inductance
• capacitance
• conductance
• none
Answer: B
###### 7.Transmission lines are classified as short, medium and long based on
• length
• no load current
• capacitance
• both A & B
Answer: D
• 1
• 0.5
• -1
• zero
Answer: C
• 0
• infinite
• 1/R
• R
Answer: D
###### 10.Transmission lines are transposed to
• reduce copper losses
• reduce skin effect
• prevent interference with neighboring lines
• prevent short circuit between any two lines
Answer: C
###### 11.Inductance of a 3- phase symmetrically spaced transmission line is __________
Answer: 2 X 10-7 log d/r
Answer: Less
Answer: 27 MVA
###### 14.A short transmission line is the equivalent circuit consisting of ____________
Answer: Series R & series L
Answer: R + j X
###### 16.When the bundled conductors are used in place of single conductor the effective capacitance _____
Answer: Increases
Answer: Long
Answer: Middle
Answer: 50 ohm
###### 20.Self GMD method is used to evaluate ______________
Answer: Inductance