Electronics and Communication Engineering - Exam Questions Papers

26. 

The figure below shows a long infinite length conduction placed as shown.

Current flowing in a conductor is 2 amps. Then magnetic field at point A is:

A.
B.
C.
D. No magnetic field

Answer: Option C

Explanation:

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27. 

Consider the following statements regarding the class-B power amplifiers (Complementary symmetry type):

  1. The efficiency of the amplifier is higher than that of class-A amplifier
  2. The power output is low
  3. Crossover distortion is present
  4. The standby power dissipation is absent.
Which of the above statements are correct?

A. 1, 2 and 3
B. 1, 2 and 4
C. 1, 3 and 4
D. 2, 3 and 4

Answer: Option C

Explanation:

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28. 

Consider the following statements:
For a 10 m long common power line connecting a switch to a light bulb

  1. It is a distributed circuit.
  2. Time delay for propagation through it is negligible.
  3. It is the form of a shielded coaxial cable of circular cross-section.
  4. As the intensity of the lamp varies, input impedance of this line also changes.
Which of the above statements is/are correct?

A. 1 only
B. 1 and 2
C. 2 and 3
D. 2 and 4

Answer: Option C

Explanation:

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29. 

The equivalent of the block diagram in figure is given in

A. Figure (a)
B. Figure (b)
C. Figure (c)
D. Figure (d)

Answer: Option D

Explanation:

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30. 

For a Hertz dipole antenna, the Half Power Beam Width (HPBW) in the E-plane is

A. 360°
B. 180°
C. 90°
D. 45°

Answer: Option B

Explanation:

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