Networks,Filters And Transmission Lines 1(TTA)
INSTRUCTIONS- 1. NUMBER OF QUESTIONS 25 2. HAS A TIME LIMIT OF 15 MINUTES 3. HAS A PASS MARKS OF 30% 4. QUESTIONS PER PAGE 1 5. EACH QUESTIONS HAS 1 MARKS 6. NEGATIVE MARKING FOR EACH QUESTIONS IS 0. 25 7. WILL ALLOW TO YOU GO BACK ,SKIP AND CHANGE YOUR ANSWERS 8. WILL ALLOW TO YOU PRINT OUT YOUR RESULT AND CERTIFICATE 9. WILL ALLOW TO YOU PRINT OUT YOURS RESPONSE SHEET WITH CORRECT ANSWER KEY AND EXPLANATION.
- 1.Coaxial lines are most suitable for............
- A.
Low frequency
- B.
High frequency
- C.
Medium frequency
- D.
Any frequency
- 2.Parallel wire lines characteristic impedance is
- A.
100 ohm to 300 ohm
- B.
200 ohm to 500 ohm
- C.
300 ohm to 700 ohm
- D.
None of these
- 3.Transmission line have
- A.
Resistance(R)
- B.
Inductance(L)
- C.
Capecitance(C)
- D.
All of these
- 4.Quarter wave lines are used to match transmission lines with...........
- A.
Antenna
- B.
Load
- C.
Both antenna and load
- D.
None of these
- 5.A line without characteristics impedance termination have
- A.
Reflected wave
- B.
Incident wave
- C.
Stationary wave
- D.
All types wave
- 6.Condition for a line to distortion less is
- A.
L/C=R/G
- B.
L/G=R/C
- C.
L/C=G/R
- D.
Any from these
- 7.VSWR of a transmission lines is
- A.
Proportional to load impedance AND inversely proportional to characteristics impedance (Zo)
- B.
proportional to characteristics impedance (Zo) AND inversely proportional to load impedance
- C.
Equal to Zo and load impedance
- D.
Proportional to minimum voltage and inversely proportional to maximum voltage
- 8.VSWR of A TRANSMISSION LINE IS
- A.
≥1
- B.
BETWEEN 0 AND 1
- C.
BETWEEN -∞ TO +∞
- D.
BETWEEN 1 AND ∞
- 9.Higher value of SWR shows
- A.
Mismatching between line and load is low
- B.
Mismatching between line and load is high
- C.
No of nodes and antenna is equal
- D.
None of these
- 10.Condition for a low loss transmission line is
- A.
R
- B.
R =wC
- C.
R>> wC
- D.
G
- 11.From following which is high frequency transmission lines
- A.
Coaxial cable
- B.
Open wire
- C.
Twin lead
- D.
All of these
- 12.Equations of phage velocity of a transmission lines is
- A.
V=1 ⁄ √LC
- B.
V=1/LC
- C.
V=√LC
- D.
V=LC
- 13.Which is a vector quantity
- A.
SWR(standing wave ratio)
- B.
Reflection coefficient
- C.
Gain
- D.
All of these
- 14.Secondary constants of a transmission lines are
- A.
α,β,Z₀
- B.
R,G,γ
- C.
γ,Vp,
- D.
α,β,Vp
- 15.Condition for a loss less transmission line is
- A.
Z₀=√ LC
- B.
Z₀=√ L/C
- C.
Z₀=√ C/L
- D.
Z₀=1/√ LC
- 16.Correct equation of VSWR is
- A.
VSWR=1+K/1-K
- B.
VSWR=1-K/1+K
- C.
VSWR=1+K
- D.
VSWR=1-K
- 17.A simplest standing wave induced when reflection coefficient is
- A.
1
- B.
0
- C.
-1
- D.
∞
- 18.Definition of VSWR is
- A.
E max / E min
- B.
E min/E max
- C.
E max= E min
- D.
All of these
- 19.If Zo=characteristics impedance,Zsc=input impedance when line is terminated in short circuitZoc=input impedance when line is terminated in open circuit then
- A.
Zo=√Zsc/Zoc
- B.
Zo=√ZscZoc
- C.
Zo=Zsc/Zoc
- D.
Zo=ZscZoc
- 20.Mismatch between load and transmission lines known as
- A.
Gain
- B.
SWR
- C.
Reflection coefficient
- D.
All of these
- 21.Q of transmission line is equal to
- A.
W/LR
- B.
WR/L
- C.
WL/R
- D.
L/R
- 22.Best method of coupling a coaxial cable with a parallel wire is
- A.
Slotted line
- B.
Balun
- C.
Use of directional coupling
- D.
Use of quarter wave transformer
- 23.For a good conductors ,constants relationship is
- A.
α=β=√wμσ/2
- B.
α=√wμσ/2 ,β=90
- C.
α=β=√μσ
- D.
α=β=√με
- 24.For a transmission line Zoc=20 ohm and Zsc=5 OHM then Zo will be
- A.
100 ohm
- B.
15 ohm
- C.
10 ohm
- D.
1000 ohm
- 25.If VSWR=2 then reflection coefficient will be,,,
- A.
1
- B.
0
- C.
2/3
- D.
1/2
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