### Electronics and Communication Engineering - Electromagnetic Field Theory MCQs Part 6

1.Consider an arbitrary distribution of conducting bodies in a charge free space according to the uniqueness theorem, which of following are required to be specified in order that the field is uniquely determined everywhere? Total charge on each conductorPotential at each conductor surfacePotential at same of conductor and total charge on the remainderTotal charge as well as potential gradient on each conductor surface Select the correct answer using the codes given below codes

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

2.The attenuation constant in case of a transmission line is

A.
B.
C.
D.

3.Which of the following is a better propagation mode to propagate television frequency modulation and radar signals?

A. Satellite communication
B. Ground propagation
C. Polarized communication
D. None of the above

4.Antenna used for T.V. broadcasting is

A. long dipole
B. metal horn
C. crossed dipole
D. log periodic

5.For a rectangular waveguide (a x b, a > b) to support only the TE10 mode at wavelength which one of the following pairs of in equalities is to be satisfied?

A. b < λ < 2b; λ > 2a
B. b < λ < 2b; λ < 2a
C. a < λ < 2b; λ < 2a
D. a < λ < 2b; λ > 2a

6.The energy stored in an electric field is given by

A.
B.
C.
D.

7.Transverse electric (TE) waves have

A. electric field component E in the direction of propagation
B. magnetic field component H in the direction of propagation
C. magnetic field component H in the direction of propagation and no component of electric field E in this direction
D. electric field component E in the direction of propagation and no component of magnetic field H in this direction

8.For infinite value of SWR on a transmission line, the line be terminated with impedance as

A. an open-circuit
B. a short-circuit
C. a pure resistance
D. all of the above

9.An electromagnetic wave incident on a perfect conductor is

A. fully transmitted
B. partially transmitted
C. entirely reflected
D. none of the above

10.A time varying magnetic field produces

A. electric field only
B. magnetic field only
C. both magnetic and electric fields
D. none of the above