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Final Examination_ECE 13_Intersem

Total questions: 38

Worksheet time: 19mins

Name
Class
Date
1.

  1. 1.     What is the lifetime of ILDs?

a)

50,000 hours

b)

75,000 hours

c)

100,000 hours

d)

125,000 hours

2.

  1. 2.     Proposed the used of clad glass fiber as a dielectric waveguide

a)

Karpon and Keck

b)

Karpon and Bockham

c)

Bockham and Kao

d)

Kao and Keck

3.

  1. 3. What is known as the different angles of entry of light into an optical fiber when the diameter of the core is many times the wavelength of the light transmitted?

a)

Acceptance angle

b)

Mode

c)

Sensor

d)

Aperture

4.

  1. 4. Infrared range for fiber optics.

a)

400-700nm

b)

700-1200nm

c)

300-2000nm

d)

400-7000nm

5.

  1. 5. Most fiber-optic light sources emit light in which spectrum?

a)

Visible

b)

Infrared

c)

Ultraviolet

d)

X-ray

6.

6. Repeaters are placed approximately every ____ in marine fiber optic cables to regenerate optical signals and compensate for signal loss.

a)

50km

b)

100km

c)

28km

d)

80km

7.

  1. 7. The core of an optical fiber has a

a)

Lower refracted index than air

b)

Lower refractive index than the cladding

c)

Higher refractive index than the cladding

d)

Similar refractive index with the cladding

8.

8.  What type of fiber has the highest

modal dispersion?

a)

Step-index single mode

b)

Graded index mode

c)

Step-index multimode

d)

Graded index multimode

9.

  1. 9. The main benefit of light-wave communications over microwaves or any other communications media is

a)

lowest

b)

better security

c)

wider bandwidth

d)

freedom from interface

10.

  1. 10. What does the acceptance half-angle determine in fiber optics?

a)

The maximum distance between two fiber optic cables

b)

The minimum wavelength of light that can be transmitted through a fiber

c)

The maximum angle at which light can enter a fiber and still be transmitted effectively

d)

The speed of light propagation within the fiber

11.

  1. 11. What multimode fiber properties help reduce connection losses?

a)

Larger core and lower NA

b)

Larger core and higher NA

c)

Smaller core size and lower NA

d)

Smaller core size and higher NA

12.

  1. 12. Which fiber optic connector is characterized by its small size and push-pull latching mechanism, making it popular for high-density applications?

a)

LC

b)

ST

c)

SC

d)

MTP

13.

  1. 13. What is the size of the ferrule commonly used in ST fiber optic connectors for both single-mode and multimode fibers?

a)

1.25mm

b)

2.5mm

c)

3.5mm

d)

4.25mm

14.

  1. 14. What is the purpose of the ferrule in a fiber optic connector?

a)

To secure the connector to the fiber optic cable

b)

To align and protect the fiber optic cores during connection

c)

To amplify the signal transmitted through the fiber optic cable

d)

To regulate the temperature of the fiber optic connection

15.

  1. 15. What was the first light source developed that could be easily coupled into a fiber?

a)

LED

b)

Lamp

c)

YAG laser

d)

PIN diode

16.

  1. 16. A horizontal antenna is

a)

Vertically polarized

b)

Horizontally polarized

c)

Centrally polarized

d)

Circularly polarized

17.

  1. 17. What determine antenna polarization?

a)

The frequency of the radiated wave

b)

The direction of the radiated wave

c)

The direction of the magnetic field vector

d)

The direction of the electric filed vector

18.

  1. 18. Which of the following is taken as reference antenna for directive gain?

a)

half-wave dipole

b)

elementary doublet

c)

isotropic

d)

infinitesimal dipole

19.

  1. 19. A form of electromagnetic waves and, like light, propagate through free space in a straight line with a velocity of 3x108 m/s.

a)

Visible light

b)

Cosmic ray

c)

X-rays

d)

Radio waves

20.

  1. 20. If the polarization vector rotates 360 degrees as the wave moves one wavelength through space and the field strength is equal at all angles of polarization.

a)

Bidirectional

b)

Unidirectional

c)

Circular

d)

Elliptical

21.

  1. 21. are used to show the relative direction of electromagnetic wave propagation.

a)

Wavefront

b)

Rays

c)

Polarization

d)

Isotropic

22.

  1. 22. is a single location from which rays propagate equally in all directions

a)

Rays

b)

Isotropic source

c)

Modes

d)

Simplex

23.

  1. 23. refers to the angle of the radiation pattern over which a transmitter’s energy is directed or received

a)

acceptance

b)

critical angle

c)

beamwidth

d)

maximum angle

24.

  1. 24. Which is a non-resonant antenna?

a)

Rhombic antenna

b)

Folded dipole

c)

End-fire array

d)

Yagi-uda antenna

25.

  1. 25. What is the amount of voltage induced in a wave by an electromagnetic wave?

a)

Magnetic field

b)

Power density

c)

Receive voltage

d)

Field strength

26.

26. In electromagnetic waves, polarization _________.

a)

Is caused by reflection

b)

Results from longitudinal nature of the waves

c)

Is always vertical in an isotropic medium

d)

Is due to the transverse nature of the waves

27.

27. Electromagnetic waves are refracted when they ______________.

a)

Encounter a perfectly conducting surface

b)

Pass through a small slot in a conducting plane

c)

Pass into a medium of different dielectric constants

d)

Are polarized at right angles to the direction of propagation

28.

  1. 28. What is the thickest layer of the ionosphere?

a)

D

b)

E

c)

F1

d)

F2

29.

  1. 29. It is typically about 5% longer than the half-wavelength dipole driven element.

a)

Folded dipole

b)

Director

c)

Reflector

d)

Feedpoint

30.

  1. 30. What is the polarization of a discone antenna?

a)

Horizontal

b)

Circular

c)

Vertical

d)

Spiral

31.

  1. 31. In what range of frequencies are most omnidirectional horizontally polarized antennas used?

a)

VLF, LF

b)

MF, HF

c)

SHF, EHF

d)

HVF,UHF

32.

  1. 32. In testing transmitter to prevent interfering with other stations, which type of antenna must be used?

a)

Void antenna

b)

Dummy antenna

c)

Hertzian antenna

d)

Isotropic antenna

33.

  1. 33. All elements in a beam ____ antennas are in line

a)

Yagi

b)

Broadside array

c)

Collinear

d)

Log-periodic

34.

  1. 34. A device that converts high frequency current into electromagnetic wave.

a)

Antenna

b)

Loudspeaker

c)

Microphone

d)

Transducer

35.

  1. 35. _______ is an antenna with a number of half-wave antenna on it.

a)

Antenna array

b)

Tower

c)

Omni-directional

d)

Rhombic

36.

  1. 36. An antenna with very high gain and very narrow beamwidth

a)

Helical antenna

b)

Discone antenna

c)

Horn antenna

d)

Parabolic antenna

37.

  1. 37. How will you increase the gain of an antenna?

a)

By adding several antennas in parallel

b)

By focusing the radiated energy in one desired direction

c)

By making antenna rods thicker

d)

By making the antenna size larger

38.

  1. 38. What is the minimum number of turns a helix antenna must have?

a)

3

b)

5

c)

4

d)

6

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