Electronics and Communication Engineering - Exam Questions Papers

46. 

Maxwell's equations establish the relationship between , , and at any point in a continuous medium. When we move from one medium to another, then which of the following statement/statements is/are correct?

A. At the boundary separating the two media, the tangential components of and are continuous.
B. At the boundary separating the two media, the tangential components of are continuous
C. If there are surface charges present on the boundary, then normal component of is continuous
D. If there are no surface charges then normal component of is discontinuous.

Answer: Option A

Explanation:

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47. 

Manganin, an alloy of copper and manganese, is used in

A. Soldering material
B. Heating elements
C. Ballast resistors
D. Standard resistances

Answer: Option D

Explanation:

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48. 

If a two-port network is reciprocal as well as symmetrical, which one of the following relationships is correct?

A. Z12 = Z21 and Z11 = Z22
B. Y12 - Y21 and Y11 - Y22
C. AD - BC = 1 and A = D
D. all of the above

Answer: Option D

Explanation:

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49. 

Which of the following antenna is obtained by modifying a waveguide?

A. Microstrip Antenna
B. Helical Antenna
C. Horn Antenna
D. Dipole Antenna

Answer: Option C

Explanation:

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50. 

Which one of the following pairs is not correctly matched?

A. NaCl : Diamagnetic
B. Gd : Paramagnetic
C. Ferrite : Ferrimagnetic
D. Cr2 O3 : Ferromagnetic

Answer: Option B

Explanation:

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