Free Printable Unit I

1.

Microwave Frequency Range lies between

a)

1 GHz to 1000 GHz

b)

1 MHz to 1000 MHz

c)

1 KHz to 1000 KHz

d)

1 Hz to 1000 Hz

2.

Properties of Antenna are

a)

Equality of Impedance

b)

Equality of Direction Pattern & Effective Length

c)

Reciprocal Device

d)

All the above

3.

Pattern that represents a plot of the magnitude of the electric or magnetic field as a function of the angular space.

a)

Field Pattern

b)

Power Pattern

c)

Both are correct

d)

None of the above

4.

When an antenna produces more efficient radiation in one direction than another, it is

a)

Isotropic Pattern

b)

Directional Pattern

c)

Omnidirectional Pattern

d)

None of the above

5.

The space surrounding an antenna is usually subdivided into

a)

Reactive near-field

b)

Radiating near-field

c)

Far-field

d)

All the above

6.

Parameter that describes how much noise an antenna produces in a given environment

a)

Gain

b)

Directivity

c)

Antenna Temperature

d)

Impedance

7.

Range of SHF is

a)

3 to 30 GHZ

b)

3 to 30 MHZ

c)

30 to 300 GHZ

d)

30 to 300 MHZ

8.

If an antenna radiates over half a sphere, directivity of the antenna is

a)

6

b)

4

c)

2

d)

8

9.

The basic requirements of transmitting antennas are

a)

High efficiency

b)

Low side lobes

c)

Large signal to noise ratio

d)

None of the mentioned

10.

The basic equation of radiation that is applied to any antenna irrespective of the type of the antenna is

a)

iL= Qv

b)

iQ = Lv

c)

i/L=Q/v

d)

None of the mentioned

11.

The number of patterns that radiation pattern require to specify the characteristic are

a)

2

b)

3

c)

4

d)

5

12.

If the path difference of two waves with single source traveling by different paths to arrive at the same point, is λ/2, what would be the phase difference between them?

a)

β x (λ/2)

b)

β / (λ/2)

c)

β + (λ/2)

d)

β – (λ/2)

13.

Which among the following defines the angular distance between two points on each side of major lobe especially when the radiation drops to zero?

a)

Half power beam width (HPBW)

b)

First null beam width (FNBW)

c)

Side lobe level (SLL)

d)

Front to back ratio (FBR)

14.

A radio link has 15 W transmitter connected to an antenna of 2.5 m2 effective aperture at 5 GHz. The receiving antenna has an effective aperture of 0.5 m2 and is located at a 15 Km line of sight distance from transmitting antenna. Assuming lossless, matched antennas, the power delivered to the receiver is:

a)

20 µW

b)

23 µW

c)

15 µW

d)

25 µW

15.

The directivity of an antenna in terms of the aperture efficiency and operating wavelength is given by:

a)

2πAe/λ2

b)

4πAe/λ2

c)

πAe/λ2

d)

All the above

Unit I

Total questions: 15

Worksheet time: 8mins

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