BAPATLA ENGINEERING COLLEGE :: BAPATLADEPARTMENT OF ECE

GATE – 2010SUB: ELECTROMAGNETIC FIELD THEORY-II

09/12/09Faculty:Dr.B.Chandra Mohan

1. The plane wave in air normally hits a lossless medium at z=0. The reflection coefficient and are (A) -1/3,2/3 (B) 0,1(C) -1,3 (D) 0.5,0.2876

2. A uniform plane wave in air with . is normally incident on a plastic region with the parameters . The standing wave ration is (A) 1 (B) 2(C) 3 (D) 4

3. A plane wave in free space with is incident normally on an interface at x=0. If a lossless medium with exists for and the reflected wave has . The permittivity of the second medium is (A) (B) (C) (D)

4. Region 1 is a lossless medium for which y ≥ 0, , where as region 2 is free space, y ≤ 0. If a plane wave exists in region 1. The total electric field component of the wave in region 2 is (A)

(B)

(C) (D) None of the above

5. A plane wave in free space (z ≤ 0) is incident normally on a large block of material with which occupies z ≥ 0. If the electric field is given by , the average power density of the transmitted wave is (A) 30 W/m2 (B) 1.278 W/m2 (C) 1.061 W/m2 (D) 10.61 W/m2

6. A 30 MHz uniform plane wave with exists in region x ≥ 0 having . At x=0, the wave encounters free

space. The maximum displacement current density in region x ≥ 0 and phase constant are (A) 12.89 mA/m2,4.32 rad/m (B) 37.6 mA/m2, 3.77 rad/m(C) 7.6 mA/m2, 3.77 rad/m (D) None of the above

7. A uniform plane wave in air is normally incident on an infinite lossless dielectric material having . If the incident wave is

, the time average power density in region 1 is (A) 3 W/m2 (B) 0.3 W/m2

(C) 0.1231 W/m2 (D) 0.54 W/m2

8. A signal in air (z≥0) with the electric field component hits normally the ocean surface at z=0.Assuming

that the ocean surface is smooth and that in ocean, the intrinsic impedance of the ocean is (A) ohms (B) ohms(C) ohms (D) ohms

9. A polarized wave is incident from air to polystyrene with at Brewster angle. The transmission angle is (A) 220 (B) 31.80

(C) 45.230 (D) 30.270

10. A uniform plane wave in air is normally incident on copper surface at z=0. The percentage of the incident power density that is transmitted into the copper is (A) 10% (B) 4%(C) 2% (D) 1%

11. Region 1, z<0 and region 2 z>0 are both perfect dielectrics. A uniform plane wave traveling in z direction has a radian frequency of 3x1010 rad/s. Its wavelengths in the two regions are 5 cm and 3 cm respectively.The percentage of the energy incident on the boundary that is transmitted is (A) 90.2 (B) 6.2 (B) 93.8 (D) None of the above

12. A 1 MHz uniform plane wave is normally incident onto a fresh water lake ( ). The fraction of the incident power that is reflected (A) 0.63 (B) 0.52(C) 0.65 (D) 0.32

13. A uniform plane wave in air is normally incident onto a lossless dielectric plate of thickness and of intrinsic impedance of . The standing wave ratio infront of the plate is

(A) 1 (B) 1.7

(C) 2 (D) 1.3

ANSWERS

1. A2. B3. D4. A5. C6. B7. C8. C9. B10. D11. B12. A13. B