Transmission Lines and Waveguides MCQs

Question 1

For perfect match between line and load, value of Kr should be

Accepted Answer

0

Answer

1

Answer

between 0 and 1

Answer

more than unity

Question 2

In a transmission line, the ratio of reflected power to incident power is given bY

Accepted Answer

Kr2

Answer

Kr

Answer

1/K1

Answer

1/I(2

Question 3

The reflection co-efficient resulting from mismatching a 50 LI load and a 150 n transmission line is

Accepted Answer

0.5

Answer

2

Answer

37.5

Answer

1/75

Question 4

If a SWR of 4 : 1 exists on a line, then its reflection co-efficient is

Accepted Answer

0.6

Answer

0.8

Answer

0.25

Answer

1.67

Question 5

If a SWR of 4 : 1 exists on a line, percentage reflected power is

Accepted Answer

36

Answer

60

Answer

66.7

Answer

40

Question 6

If a SWR of 4 : 1 exists on a line, percentage power absorbed by the load is

Accepted Answer

64

Answer

40

Answer

60

Answer

33.3

Question 7

A transmission line of 50 ohm characteristic impedance is terminated in a resistive load of 100 ohm. The voltage reflection co-efficient equals

Accepted Answer

0

Answer

3

Answer

2

Answer

1

Question 8

A quarter-wave transformer is

Accepted Answer

a segment of transmission line near the load end which is equal in length to one-quarte of wavelength of the signal on the line

Answer

a two-winding conventional transformer having core length equal to X/4

Answer

an auto-transformer having total wiring length equal to X/4

Answer

an ordinary transformer used to connect load and line at a distance of X/4 from the input end.

Question 9

Which of the following statement is not correct?The function of a quarter-wave transmer is to

Accepted Answer

reduce SWR to 1: 1

Answer

make it appear that load and line are matched reduce line losses

Answer

increase reflection co-efficient