Electronics & Communication

Dear Candidate,

This is an online Technical test being conducted.

Please note: There is no negative marking.

1.The wavelength of an electromagnetic wave in a wave guide.

(a)Is directly proportional to the group velocity.

(b)Is inversely proportional to the phase velocity.

(c)Is less than in free space.

(d)Is greater than in free space.

2.Due to reflection from a plane conducting wall the electromagnetic waves acquire an apparent velocity greater than the velocity of light in free space, this velocity is called

(a)Normal velocity

(b)Phase velocity

(c)Velocity propagation

(d)Group velocity

3.The wave propagation occurs without attenuation in case a

(a)conductor

(b)semi - conductor

(c)perfect dielectric

(d)none of the above

4.Surface impedance at high frequencies is a consideration for

(a)good conductors

(b)semi conductors

(c)dielectrics

(d)ferrites

5.The polarization of electromagnetic wave is the direction of

(a)magnetic field

(b)electric field

(c)electric and magnetic field

(d)none of the above

6.The polarization of dielectric materials results in

(a)Production of eddy currents

(b)Creation of electric dipoles

(c)Absorption of electrons

(d)Release of high velocity protons

7.Which of the following waves do not exist in wave guides?

(a)TE waves

(b)TM waves

(c)TE and TM waves

(d)TEM waves

8.What will happen to a bird sitting on a conductor carrying 11 KV?

(a)It will die of shock

(b)It will not die of shock because its claws are insulated

(c)It will not die because it is insulated from earth and other conductors

(d)None of the above

9. ……. is a solar quantity.

(a)Electric field strength

(b)Potential in electric field

(c)Electric displacement density

(d)None of the above