Electromagnetic Field Theory - Study Mode
[#236] Consider the following statements regarding the load matching and impedance measurements: 1. A mismatched load can be properly matched to a line by inserting prior to the load a transmission line $$frac{lambda }{4}$$ long. 2. For matching of 120 Ω load to a 75 Ω line, the quarter-wave transformer must have a characteristic impedance of 190 Ω. 3. The main disadvantage of single-stub matching is that it is a narrow-band or frequency-sensitive device. Which of the above statements are not correct?
Correct Answer
(B) 2 and 3 only
[#237] What is the minimum value of VSWR that may exist on a transmission line?
Correct Answer
(C) One
[#238] The electric field around a positive charge is
Correct Answer
(B) outward
[#239] An electromagnetic wave is transmitted into a conducting medium of conductivity ?. The depth of penetration is
Correct Answer
(D) inversely proportional to square root of frequency
[#240] What is the effect of the earth's magnetic field in the reflected wave at frequencies in the vicinity of gyro-frequency?
Correct Answer
(C) Increased attenuation in the reflected wave