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BSNL TTA ONLINE TEST - 2 Network, Filters and Transmission Lines

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Subject : Network, Filters and Transmission Lines Instruction: Time limit for the exam: 25 Minutes Total number of questions : 30 Q Each question carry 1 mark, no negative marks. DO NOT refresh the page. All the best by BSNL ACADEMY If U Like Our Test series than Share with your friends and Rate Our Tests.
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Created by BSNL ACADEMY over 8 years ago
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Resource summary

Question 1

Question
Proximity effect depends on
Answer
  • frequency
  • distance between the conductors
  • relative permeability
  • all of the above

Question 2

Question
Skin effective is more in case of
Answer
  • communication lines
  • power lines
  • same in both cases
  • none of the above

Question 3

Question
Apart from the skin effect the non uniformity of the current distribution is also caused by
Answer
  • bundled conductors
  • ferranti effect
  • proximity effect
  • all of the above

Question 4

Question
Transmission lines are transposed to reduce
Answer
  • interference with neighbouring communication lines
  • ferranti effect
  • proximity effect
  • skin effect

Question 5

Question
In transmission lines distribution constants are
Answer
  • inductance and capacitance
  • resistance
  • inductance and resistance
  • both 1 and 2

Question 6

Question
Aluminium is now most commonly employed conductor material in transmission lines than copper because
Answer
  • it is more conductive
  • its tensile strength is more
  • costlier
  • it is cheaper and lighter

Question 7

Question
ACSR means
Answer
  • Aluminium core steel reinforced
  • Aluminium conductor steel reinforced
  • Aluminium copper steel reinforced
  • all conductor steel reinforced

Question 8

Question
The inductance of single phase two wire line is given by
Answer
  • 4*10-7* ln(d/r') H/m
  • 4*10-7* ln(r'/d) H/m
  • 0.4*10-7* ln(d/r') H/m
  • 0.4*10-7* ln(r'/d) H/m

Question 9

Question
If the diameter of the conductor is increased
Answer
  • the inductance is increased
  • the inductance is decreased
  • the resistance is increased
  • no change in inductance and resistance

Question 10

Question
Which of the following statements is/are true
Answer
  • Voltage regulation for short transmission line = (Vs - Vr) / Vr
  • Voltage regulation for medium transmission line = (Vs - Vr) / Vr
  • Voltage regulation for long transmission line = (Vs - Vr) / Vr
  • all of the above

Question 11

Question
The ABCD constants of a 3-phase transmission line are A = D = 0.8∠1°, B = 170∠85° Ω , C = 0.002∠90.4° ℧. The sending end voltage is 400 kV. The receiving end voltage under no load condition is
Answer
  • 400 kV
  • 500 kV
  • 600 kV
  • 350 kV

Question 12

Question
Surge impedance loading of a 3-phase, 400 kV transmission line is 400 Ω. The surge impedance loading is
Answer
  • 400 MW
  • 800 MW
  • 1600 MW
  • 200 MW

Question 13

Question
Surge impedance loading of a transmission line can be increased by
Answer
  • increasing its voltage level
  • addition of lumped inductance in parallel
  • addition of lumped capacitance in series
  • both 1 and 3

Question 14

Question
For transmission line which one of the following relation is true?
Answer
  • AD - BC = 0
  • AD + BC = 0
  • AD - BC = 1
  • AD - BC = -1

Question 15

Question
A 3-phase transmission line has its conductors at the corners of an equilateral triangle with side 3m. The diameter of each conductor is 1.63 cm. The inductance of the line per phase per km is
Answer
  • 1.093 mH
  • 1.043 mH
  • 1.182 mH
  • 1.232 mH

Question 16

Question
In series RLC circuit which of the following represents the Q factor ?
Answer
  • XC/R
  • VR/V
  • XL/R
  • All of the above

Question 17

Question
In series RLC circuit what is the power factor just bellow the resonance frequency?
Answer
  • Lagging
  • Leading
  • Unity
  • Zero

Question 18

Question
Which of the following represents the resonance frequency (ω0) with respect to lower cutoff frequency (ω1) and higher cutoff frequency (ω2)
Answer
  • ω1 + ω2
  • ω1 - ω2
  • ω1 / ω2
  • √(ω1² + ω2²)

Question 19

Question
In a series resonance circuit if bandwidth is 1 MHz and inductance is 1 mH, then what is the resistance value?
Answer
  • 1 KΩ
  • 1 MΩ
  • 1 Ω
  • 100 Ω

Question 20

Question
Time constant of RL series circuit is
Answer
  • 2L/R
  • RC
  • L/R
  • 2RC

Question 21

Question
Time constant is the time taken for response to rise -------of maximum value?
Answer
  • 63.2%
  • 100%
  • 90%
  • 68.3%

Question 22

Question
In which of the following oscillations are not present?
Answer
  • Under damping
  • Over damping
  • Critical damping
  • Both 2 and 3

Question 23

Question
In RLC series circuit R=2Ω, L=2mH and C=1μF and applied voltage is 10V dc. Then what is steady state current value?
Answer
  • 5A
  • 2A
  • 1A
  • 0A

Question 24

Question
Image impedance can be written by using short circuit impedance(Zsc)and open circuit impedance(Zoc) as
Answer
  • Zsc+Zoc
  • Zsc-Zoc
  • Zsc/Zoc
  • (Zsc . Zoc)½

Question 25

Question
Poles and zeros are arranged alternatively on imaginary axis, then type of network is?
Answer
  • RLC network
  • LC network
  • RC network
  • RL network

Question 26

Question
In ideal system coefficient of coupling(k) is
Answer
  • 0
  • 1
  • ∞
  • 1 & ∞ Both

Question 27

Question
Basic cut set matrix consists of
Answer
  • one branch
  • no branches
  • 2 branch
  • any number of branches

Question 28

Question
Active filter consists of
Answer
  • Capacitor
  • Inductor
  • op-amp and capacitor
  • op-amp

Question 29

Question
Reciprocity condition for h parameters is
Answer
  • h12 = h21
  • h12 = -h21
  • h11h22 - h21h12 = 0
  • h11 = h22

Question 30

Question
A pole of driving point impedance is
Answer
  • Zero current for a finite value of driving voltage
  • Zero voltage for a finite value of driving current
  • Zero voltage for a finite value of driving voltage
  • Zero current for a finite value of driving current
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