Electromagnetic Field Theory(Electrical Engineering ) Questions and Answers

Question 1. Which antenna is a wideband antenna?
  1.    Hertz antenna
  2.    Marconi antenna
  3.    Folded dipole
  4.    None of the above
Explanation:-
Answer: Option C. -> Folded dipole
Question 2. The potential that appears at a point in space due to the current which caused it is called potential
  1.    Accelerating
  2.    Retardation
  3.    Oscillating
  4.    Lagging the current
Explanation:-
Answer: Option B. -> Retardation
Question 3. The minimum height of outer atmosphere is
  1.    100 km
  2.    150 km
  3.    200 km
  4.    400 km
Explanation:-
Answer: Option D. -> 400 km
Question 4. A loop antenna is a commonly used for
  1.    Radar
  2.    Direction finding
  3.    Satellite communication
  4.    All of the above
Explanation:-
Answer: Option B. -> Direction finding
Question 5. The divergence of a vector is a scalar, while the curl of a vector is another
  1.    Scalar
  2.    Vector
  3.    Unit vector
  4.    None of the above
Explanation:-
Answer: Option B. -> Vector
Question 6. Tropospheric scatter propagation is not subject to any fading.
  1.    True
  2.    False
Explanation:-
Answer: Option B. -> False
Question 7. A square corner reflector is used in which of the following?
  1.    TV broadcast
  2.    Point-to-point communication
  3.    Radio astronomy
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Question 8. In case of surface waves the field strength at a point is directly proportional to
  1.    Antenna height
  2.    Wave frequency
  3.    Current of the antenna
  4.    Distance of the point from the antenna
Explanation:-
Answer: Option D. -> Distance of the point from the antenna
Question 9. In an impedance smith chart, a clockwise movement along a constant resistance circle gives rise to
  1.    Decrease in the value of reactance
  2.    An increase in the value of reactance
  3.    No change in the reactance value
  4.    No change in the impedance value
Explanation:-
Answer: Option B. -> An increase in the value of reactance
Question 10. The radiation pattern of Hertzian dipole in the plane perpendicular to dipole is a
  1.    Null
  2.    Circle
  3.    Figure of eight
  4.    None of the above
Explanation:-
Answer: Option C. -> Figure of eight
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