Electrical Online Test 23
Category –EE Online Test
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Attempt Free Electrical Online Test 23 Here. Read The Important Electrical MCQ From Below.
1) 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
Ans. a. 100 ohm to 300 ohm
2) 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
Ans. b. Balun
3) Which is a vector quantity
a. SWR(standing wave ratio)
b. Reflection coefficient
c. Gain
d. All of these
Ans. b. Reflection coefficient
4) A line without characteristics impedance termination have
a. Reflected wave
b. Incident wave
c. Stationary wave
d. All types wave
Ans. a. Reflected wave
Electrical Online Test 23
5) Mismatch between load and transmission lines known as
a. Gain
b. SWR
c. Reflection coefficient
d. All of these
Ans. c. Reflection coefficient
6) From following which is high frequency transmission lines
a. Coaxial cable
b. Open wire
c. Twin lead
d. All of these
Ans. d. All of these
7) 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
Ans. b. Mismatching between line and load is high
8) Q of transmission line is equal to
a. W/LR
b. WR/L
c. WL/R
d. L/R
Ans. c. WL/R
Electrical Online Test 23
9) Transmission line have
a. Resistance(R)
b. Inductance(L)
c. Capecitance(C)
d. All of these
Ans. d. All of these
10) A simplest standing wave induced when reflection coefficient is
a. 1
b. 0
c. -1
d. ∞
Ans. a. 1
11) Equations of phage velocity of a transmission lines is
a. V=1 ⁄ √LC
b. V=1/LC
c. V=√LC
d. V=LC
Ans. a. V=1 ⁄ √LC
12) Condition for a loss less transmission line is
a. Z₀=√ LC
b. Z₀=√ L/C
c. Z₀=√ C/L
d. Z₀=1/√ LC
Ans. b. Z₀=√ L/C
13) Definition of VSWR is
a. E max / E min
b. E min/E max
c. E max= E min
d. All of these
Ans. a. E max / E min
Electrical Online Test 23
14) If VSWR=2 then reflection coefficient will be,,,
a. 1
b. 0
c. 2/3
d. 1/2
Ans. d. 1/2
15) 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
Ans. a. α=β=√wμσ/2
16) Quarter wave lines are used to match transmission lines with………..
a. Antenna
b. Load
c. Both antenna and load
d. None of these
Ans. a. Antenna
17) 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
Ans. a. L/C=R/G
18) Coaxial lines are most suitable for…………
a. Low frequency
b. High frequency
c. Medium frequency
d. Any frequency
Ans. b. High frequency
Electrical Online Test 23
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
Ans. b. Zo=√ZscZoc
20) Condition for a low loss transmission line is
a. R<
b. R =wC
c. R>> wC
d. G <
Ans. c. R>> wC
Electrical Online Test 23
21) 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
Ans. a. VSWR=1+K/1-K
22) VSWR of A TRANSMISSION LINE IS
a. ≥1
b. BETWEEN 0 AND 1
c. BETWEEN -∞ TO +∞
d. BETWEEN 1 AND ∞
Ans. d. BETWEEN 1 AND ∞
23) 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
Ans. c. 10 ohm
24) 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
Ans. c. Equal to Zo and load impedance
25) Secondary constants of a transmission lines are
a. α,β,Z₀
b. R,G,γ
c. γ,Vp,
d. α,β,Vp
Ans. a. α,β,Z₀
Electrical Online Test 23
