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.
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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° â„§.
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