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Worksheets

Antennas

Total questions: 61

Worksheet time: 47mins

Name
Class
Date
1.

Up to which frequency the ground wave propagation is used?

a)

2 MHz

b)

2 GHz

c)

30 MHz

d)

30 GHz

2.

In a ground wave propagation, which component of electric field is short circuited when it’s in contact by earth?

a)


Both horizontal and vertical

b)

Neither horizontal nor vertical

c)

Horizontal

d)

Vertical

3.

Sky wave propagation reflects the frequencies ___________

a)

2MHz

b)

2 MHz to 30MHz

c)

2 GHz to 30 GHz

d)

30 GHz to 50GHz

4.

At what distance the sky wave propagation is present from the earth surface?

a)

50 to 400km

b)

Below 50 km

c)

600 to 750km

d)

50 to 400 m

5.

Space wave propagation reflects the waves with frequencies _________

a)

Below 2 GHz

b)

2 to 30MHz

c)

Above 30GHz

d)

Above 30MHz

6.

Space wave propagates at which frequency band?

a)

VHF

b)

HF

c)

MF

d)

EHF

7.

A radio can tune to any station in the frequency range from 2.5 MHz to 15 MHz bands. What is the corresponding wavelength band?

a)

30 m to 130 m

b)

40 m to 140 m

c)

20 m to 120 m

d)

10 m to 110 m

8.

What is the unit for relative permittivity?

a)

F/m

b)

Fm

c)

F/m2

d)

No unit

9.

absolute permittivity ε₀ is equal to

a)

4π ×10−7 F/m

b)

3 ×108 F/m

c)

1.16 ×10−19 F/m

d)

8.85 x 10⁻¹² F/m

10.

Absolute permeability μ₀ is equal to

a)

4π × 10⁻⁷

b)

3 × 108

c)

1.16 × 10⁻19

d)

8.85 ×10−12

11.

For good conductors, which condition will be true?

a)

σ/ωε > 1

b)

σωε > 1

c)

σ/ωε < 1

d)

σωε < 1

12.

For good dielectrics or insulators, which condition will be true?

a)

σ/ωε > 1

b)

σωε > 1

c)

σ/ωε < 1

d)

σωε < 1

13.

Calculate the velocity of wave propagation in a conductor with frequency 5 x 108 rad/s and phase constant of 3 x 108 units.

a)

3/5

b)

15

c)

5/3

d)

8

14.

Calculate the wavelength of the wave with phase constant of 3.14 units.

a)

1

b)

2

c)

0.5

d)

4

15.

For dielectrics, which two components will be in phase?

a)

E and wave direction

b)

H and wave direction

c)

Wave direction and E x H

d)

E and H

16.

The expression for phase constant is given by

a)

Phase constant β = ωμε

b)

Phase constant ω = με

c)

Phase constant β = ω√(με)

d)

Phase constant β = 1/ωμε

17.

The attenuation constant in lossless dielectrics will be

a)

0

b)

1

c)

-1

d)

∞

18.

Which of the following type does horn antenna belongs?

a)

Wire Antenna

b)

Array Antenna

c)

Aperture Antenna

d)

Lens Antenna

19.

Which of the following antenna is mainly used for broadband signals?

a)

Marconi antenna

b)

Horn antenna

c)

Wire antenna

d)

Yagi-Uda antenna

20.

In which of the following bands the horn antenna operates?

a)

HF and VHF

b)

UHF and LF

c)

UHF and SHF

d)

LF and VHF

21.

In a horn antenna, with increase in aperture, the directivity is ____ and diffraction is ______

a)

increased, decreased

b)

decreased, increased

c)

increased, increased

d)

decreased, decreased

22.

In which of the following modes of propagation the ionosphere acts as the reflecting surface for the waves?

a)

Ground wave

b)

Sky wave

c)

Space wave

d)

LOS

23.

What is the highest frequency that can be sent straight upward and be returned to earth?

a)

MUF

b)

skip frequency

c)

critical frequency

d)

gyro frequency

24.

Medium frequency range is from

a)

0.01 to 0.03 MHz

b)

0.03 to 0.3 MHz

c)

0.3 to 3 MHz

d)

3 to 30 MHz

25.

High frequency range is from?

a)

0.3 to 3 MHz

b)

3 to 30 MHz

c)

30 to 300 MHz

d)

3 to 30 MHz

26.

One of the major propagation factors which can hinder space communications in the frequency bands

above about 3 GHz is the gaseous attenuation.

a)

True

b)

False

27.

The refraction is considered one of the electrical properties of the transmission medium

a)

True

b)

False

28.

Duct propagation is due to Temperature Inversion layer

a)

True

b)

False

29.

Mathematical prediction of radio waves was done by

a)

  1. Einstein

b)

  1. Hertz

c)

  1. Faraday

d)

  1. Maxwell

30.

The electric field and magnetic field of a radio wave are

a)

  1. Perpendicular to each other

b)

  1. Perpendicular to the direction of propagation

c)

  1. Both a and b

d)

  1. None of the above

31.

Units of radiation intensity is _______

a)

Watts/unit Solid angle

b)

Watts/m2

c)

Watts- m2

d)

Watts

32.

The graphical representation of the radiation properties of the antenna as a function of space coordinates is called Radiation pattern.

a)

True

b)

False

33.


a)

4π2

b)

8π2/3

c)

4π2/3

d)

2π2/3

34.

Which of the following pattern varies with square of magnitude of field?

a)

Power Pattern

b)

Electric Field Pattern

c)

Current distribution

d)

Array Factor

35.

The radiation lobe containing the direction of maximum radiation is called as _____

a)

Major lobe

b)

Minor lobe

c)

Side lobe

d)

Back lobe

36.

Fresnel zone is also called as ____

a)

Near Field

b)

Far Field

c)

Electrostatic Field

d)

Reactive Field

37.

If FNBW is 6°, then resolution is ____

a)

12°

b)

3°

c)

2°

d)

6°

38.

For a center fed short antenna, current distribution is _____ at center and ____ at ends.

a)

Low, high

b)

High, high

c)

Low, low

d)

High, low

39.

The portion of the near field immediate to the surrounding the antenna is called as _____

a)

Reactive near-field

b)

Radiating near-field

c)

Fraunhofer zone

d)

Far field

40.

The region of the field that angular field distribution is independent of the distance from the antenna is called as _______

a)

Reactive near-field

b)

Radiating near-field

c)

Fresnel zone

d)

Far field

41.

For a Hertz dipole antenna, the half power beam width (HPBW) in the E-plane is

a)

  1. 360°

b)

  1. 180°

c)

  1. 90°

d)

  1. 45°

42.


a)

Far field region

b)

Near filed region

c)

Radiative Field

d)

Reactive Field

43.

Radiative and Non Radiative fields are parts of which field region?

a)

Near field

b)

Fresnel field

c)

Reactive field

d)

Far field

44.

Power radiated by a Hertzian dipole of length λ/30 and carrying a current 2A?

a)

0.87W

b)

3.51W

c)

2.51W

d)

8.77W

45.

If the radiation resistance of a Hertzian dipole is 100Ω, then the radiation resistance of short dipole is ____Ω.

a)

25

b)

50

c)

73

d)

35.6

46.

The radiation resistance of a monopole is _____ times the current element.

a)

1/8

b)

1/4

c)

1/2

d)

1/16

47.

Which of the following polarization is used in monopole antenna?

a)

Right-hand Circular

b)

Linear

c)

Depends on the feed

d)

Left-hand Circular

48.

Which type of polarization is found in parabolic reflector?

a)

Right-hand Circular

b)

Linear

c)

Depends on the feed

d)

Left-hand Circular

49.

In which of the following polarization the electric field components are perpendicular to each other and have equal magnitude?

a)

Linear

b)

Vertical

c)

Circular

d)

Elliptical

50.

Which of the following is true for the circular polarization?

a)

Ex=Ey, and ∅=π/2

b)

Ex≠Ey, and ∅=π/2

c)

Ex≠Ey, and ∅=π/4

d)

Ex=Ey, and ∅=π/4

51.

Which of the following is true for the elliptical polarization?

a)

Ex=Ey, and ∅=π/2

b)

Ex≠Ey, and ∅=π/2

c)

Ex≠Ey, and ∅=π/4

d)

Ex=Ey, and ∅=π/4

52.

The ratio of maximum power density in the desired direction to the average power radiated from the antenna is called as _______

a)

directivity

b)

directive gain

c)

power gain

d)

partial directivity

53.

What is the Beam area for Directivity to be 1 in Steradian?

a)

4π

b)

1/2π

c)

2π

d)

1/4π

54.

Directive gain with maximum radiation intensity is called as Directivity.

a)

True

b)

False

55.

For aperture antenna to be efficient and have high directivity, its area should be ____________

a)

≥ λ2

b)

≥ 1/λ

c)

≤ λ2

d)

≤ λ

56.

Which of the following modes does the condition πD << λ is satisfied in helical antenna?

a)

Axial mode

b)

Normal mode

c)

Axial, Normal and Conical

d)

Conical mode

57.

What is the necessary condition for a helical antenna to operate in the axial mode?

a)

πD << λ

b)

πD ≈ λ

c)

πD ≈ nλ

d)

πD=0

58.

What is the Input impedance of the axial feed helical antenna with circumference per unit wavelength is 1.2?

a)

168Ω

b)

186Ω

c)

198Ω

d)

158Ω

59.

What is the total axial length of the helical antenna with 5 turns and circumference per wavelength is 1.2 and separation between turns is 2 cm?

a)

10 cm

b)

6 cm

c)

12 cm

d)

20 cm

60.

The direction of maximum radiation in end-fire array is ______ with respect to the array axis.

a)

0° or 180°

b)

90°

c)

45°

d)

270°

61.

Communication through LOS can be increased by decreasing the height of antenna.

a)

True

b)

False

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