# 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) X_{L}+X_{c}

d) X_{L}/X_{c}

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