Microwave Engineering Questions and Answers – Terminated Lossless Transmission Lines – 2

This set of Microwave Engineering Interview Questions and Answers focuses on “Terminated Lossless Transmission Lines – 2”.

1. Expression for input impedance of a transmission line in terms of load impedance and characteristic impedance is:
a) Z0 (ZL+j Z0tan βl)/ (Z0+j ZLtan βl)
b) (Z0+j ZLtan βl)/ (ZL+j Z0tan βl)
c) Z0 (ZL-j Z0tan βl)/ (Z0-j ZLtan βl)
d) (Z0-j ZLtan βl)/ (ZL-j Z0tan βl)
View Answer

Answer: a
Explanation: Representing the input voltage as the ratio of voltage at current, representing voltage and currents in hyperbolic function form and simplifying, we get Z0 (ZL+j Z0tan βl)/ (Z0+j ZLtan βl).

2. Input impedance of a short circuited transmission line is :
a) -jZ0tanβl
b) jZ0tanβl
c) jZ0cotβl
d) – jZ0cotβl
View Answer

Answer: b
Explanation: Since the load impedance of a short circuited transmission line is zero, substituting ZL=0 in the expression for input impedance of a transmission line Z0 (ZL+j Z0tan βl)/ (Z0+j ZLtan βl), input impedance of the transmission line comes out to be jZ0tanβl.

3. Input impedance of a transmission line can be represented in terms of this simple trigonometry function.
a) sine function
b) cosine function
c) cotangent function
d) tangent function
View Answer

Answer: d
Explanation: The input impedance of a transmission line is expressed in the standard form as Z0 (ZL+j Z0tan βl)/ (Z0+j ZLtan βl) which is represented in terms of a tangent function.
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4. If a ƛ/3 transmission line is short circuited that has a characteristic impedance of 50 Ω, then its input impedance is:
a) -j100Ω
b) 50Ω
c) 86.60Ω
d) –j86.60Ω
View Answer

Answer: d
Explanation: For a short circuited transmission line, the input impedance is given by jZ0tanβl.substituting for characteristic impedance and ‘l’ in the above equation, input impedance is –j86.60Ω.

5. Expression for input impedance of an Open circuited transmission line is:
a) -jZ0tanβl
b) jZ0tanβl
c) jZ0cotβl
d) -jZ0cotβl
View Answer

Answer: d
Explanation: Since the load impedance of a open circuited transmission line is infinity, substituting ZL=infinity (1/ ZL =0) in the expression for input impedance of a transmission line Z0 (ZL+j Z0tan βl)/ (Z0+j ZLtan βl), input impedance of the open circuited transmission line comes out to be- jZ0cotβl.

6. Input impedance of a open circuited transmission line is represented using this trigonometric function:
a) sine function
b) cosine function
c) cotangent function
d) tangent function
View Answer

Answer: c
Explanation: The input impedance of a transmission line is expressed in the standard form as Z0 (ZL+j Z0tan βl)/ (Z0+j ZLtan βl). With ZL equal to infinity for open circuit termination, 1/ ZL equal to 0, substituting this, we get input impedance in terms of a cotangent function.

7. For a λ/2 transmission line, if the characteristic impedance of the line is 50 Ω and the terminated with a load of 100 Ω, then its input impedance is:
a) 100Ω
b) 50Ω
c) 88.86Ω
d) none of the mentioned
View Answer

Answer: a
Explanation: Input impedance of a transmission line is given by Z0 (ZL+j Z0tan βl)/ (Z0+j ZLtan βl). Substituting β=2π/λ, and l=λ/2, we get input impedance of the transmission line equal to the load impedance or the terminated load.
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8. If a λ/3 transmission line is open circuited and has characteristic impedance of 50 Ω then the input impedance is:
a) j28.86Ω
b) 50Ω
c) j50Ω
d) 28.86Ω
View Answer

Answer: a
Explanation: Input impedance of an open circuited transmission line is given by – jZ0cotβl. Substituting l=λ/3 and β=2π/λ in the above equation, input impedance is j28.86Ω.

9. Expression for a transmission co-efficient of a transmission line is :
a) 2ZL/ ( ZL+Z0)
b) (ZL-Z0)/ (ZL+Z0)
c) 2Z0/( ZL+Z0)
d) (ZL+Z0)/ (ZL-Z0)
View Answer

Answer: a
Explanation: T=┌+1, where T is the transmission co-efficient and ┌ is the reflection co-efficient substituting ┌= (ZL-Z0)/ (ZL+Z0) in the equation for transmission co-efficient, we get 2ZL/ ( ZL+Z0).
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10. For a transmission line, if the reflection coefficient is 0.4, then the transmission coefficient is:
a) 0.4
b) 1.4
c) 0.8
d) 2.8
View Answer

Answer: b
Explanation: T=┌+1, where T is the transmission co-efficient and ┌ is the reflection co-efficient substituting ┌=0.4 in the above equation, transmission co-efficient is equal to 1.4.

11. If the transmission coefficient of a transmission line is 1.6, then the reflection co efficient is:
a) 0.8
b) 0.6
c) 0.4
d) 0.3
View Answer

Answer: b
Explanation: T=┌+1, where T is the transmission co-efficient and ┌ is the reflection co-efficient substituting T=1.6, we get ┌=0.6.

12. For a transmission line, if the transmission coefficient is 1.4, then the insertion loss in dB is:
a) -2.922dB
b) 29dB
c) 1.46dB
d) -29dB
View Answer

Answer: a
Explanation: Insertion loss for a transmission line is given by the expression -20loglTl in dB. Substituting T=1.4 and taking logarithm to base 10, insertion loss is -2.922dB.

13. The relation between nepers and decibels is:
a) 1 Np= 8.686 dB
b) 1 dB=8.868 dB
c) Np≥dB
d) dB≥Np
View Answer

Answer: a
Explanation: 1 Np=10log e2 dB. Substituting e=2.718 in the above equation , 1Np=8.686 dB.

Sanfoundry Global Education & Learning Series – Microwave Engineering.
To practice all areas of Microwave Engineering for Interviews, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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