# Lossless Lines MCQ’s

This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Lossless Lines”.

1. If propagation constant is 12:60°, then the value of phase constant and attenuation constant is:
a) α=6, β=10.39
b) α=61, β=78
c) α=12, β=20.6
d) none of the mentioned

2. If a transmission line with inductive reactance of 41.97 Ω and capacitive reactance of 1132.5Ω is operated at 1 GHz , then its phase constant is:
a) 0.0305
b) 0.3
c) 30.3
d) 0.6

3. The value of ‘α’ for a lossless line is:
a) 0
b) 1
c) Infinity
d) Data insufficient

4. The expression for a phase velocity of a transmission line is:
a) √LC
b) 1/√LC
c) XL+Xc
d) XL/Xc

5. For a lossless line, which of the following is true?
a) γ=jβ
b) γ=α
c) γ=α+jβ
d) γ=α*jβ

6. A microwave generator at 1.2 GHz supplies power to a microwave transmission line having the parameters R=0.8Ω/m, G=O.8millisiemen/m, L=0.01µH/m and C=0.4PF/m. Propagation constant of the transmission line is:
a) 0.0654 +j0.48
b) 0.064+j4.8
c) 6.4+j4.8
d) none of the mentioned

7. If the admittance and the impedance of a transmission line are 100 Ω and 50 Ω of a respectively, then value of phase constant β is:
a) 0
b) 20
c) 132
d) 50

8. Expression for phase constant β is:
a) √LC
b) ω √LC
c)1/ (ω √LC)
d) None of the mentioned

9. In a certain microwave transmission line, the characteristic impedance was found to be 210 10°Ω and propagation constant 0.2 78°.What is the impedance Z of the line, if the frequency of operation is 1 GHz?
a) 0.035+j41.97
b) 0.35+j4.97
c) 35.6+j4.28
d) 9.254+j4.6

10. For a transmission line, L=1.8mh/m C=0.01pF/m, then the phase constant of the line when operated at a frequency of 1 GHz is:
a) 4.2426
b) 2.2
c) 0.3
d) 1