71. Which one of the following statements is correct?
72. When compared with stripline, the major disadvantage of microstrip line is
73. Some unknown material has a conductivity 106 mho/m and a permeability of 4π × 10-7 H/m. The skin depth for the material at 1 GHz is
74. Match List-I with List-II and select the correct answer using the options given below:
List-I (Load impedance)
List-II (Value of Reflection Coefficient)
a. Short circuit
1. 0
b. Open Circuit
2. -1
c. Line characteristic impedance
3. +1
d. 2 × line characteristic impedance
4. $$ + \frac{1}{3}$$
| List-I (Load impedance) | List-II (Value of Reflection Coefficient) |
| a. Short circuit | 1. 0 |
| b. Open Circuit | 2. -1 |
| c. Line characteristic impedance | 3. +1 |
| d. 2 × line characteristic impedance | 4. $$ + \frac{1}{3}$$ |
75. The conducting thin coils X and Y (identical except for a thin cut in coil Y) are placed in a uniform magnetic field which is decreasing at a constant rate. If the plane of the coils is perpendicular to the field lines, which of the following statement is correct? As a result, emf is induced in:
76. Who developed the concept of time varying electric field producing a magnetic field?
77. Electromagnetic waves are produced by
78. The characteristic impedance of a cable is about
79. The VSWR of a microwave unit is 1.5, the return loss is:
80. A medium is divided into regions I and II about x = 0 plane, as shown in the figure below. An electromagnetic wave with electric field $${\overrightarrow E _1} = 4{{\hat a}_x} + 3{{\hat a}_y} + 5{{\hat a}_z}$$ is incident normally on the interface from region-I. The electric field $${\overrightarrow E _2}$$ in region-II at the interface is
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