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A slotted line is used to measure the voltage maximums and voltage minimums on a transmission line with a characteristic impedance of 50 n. The voltage maximum is measured as 7.5 V and the  minimum is 5 V. The line is terminated with a purely resistive load. What is the load impedance?

A. 5 n

B. 12 n

C. 25 n

D. 75 n

The transmission line input impedance is equal to its characteristic impedance when

A. it's lossless.

B. it has finite length.

C. it's nonresonant.

D. its capacitance is equal to its inductance.

A TDR is being used to analyze a transmission line problem. The oscilloscope display shows a positive-going voltage step with a DC level equal to twice the input voltage at 2 ms. What can be determined from this display?

A.There's a short circuit at a point 2msVpfrom the source.

B.There's a short circuit at a point 1msVpfrom the source.

C.There's an open circuit at a point 2msVpfrom the source.

D.There's an open circuit at a point 1msVpfrom the source.

A 300transmission line is terminated with an antenna that presents a (450-j600 ) load impedance. What is the normalized load admittance?

A. 0.002 +j0.0016

B. 0.24 +j0.32

C. 1.5 -j2

D. 1 +j1.7

How far from the load should a short-circuit stub be placed to match the load in question 9?

A. 0.07

B. 0.25

C. 0.052

D. 0.130

How long should the stub in question 9 be?

A. 0.085

B. 0.18

C. 0.334

D. 0.601

What is the VSWR after matching at the input of the transmission line in question 9?

A. 1.7

B. 1

C. 0.55

D. 0.38

A shorted stub is used instead of an inductor in tuners because of

A. cost considerations.

B. space considerations.

C. superior selectivity.

D. broader bandwidth.

A load of 100 +j50 is to be matched to a 50transmission line using a/4matching section. How much transmission line is needed between the load and the/4matching section?

A. 0.038

B. 0.138

C. 0.28

D. 0.78

Dielectric losses occur when

A. the conductor separation is too great.

B. the conductor separation is too small.

C. currents flow from one conductor to the other through the dielectric.

D. the cable is unshielded.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M91915309

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