Which type of antenna is used for center excited cells?
a) Dipole antenna
b) Grid antenna c) Sectored antenna d) Omnidirectional antenna
a) Dipole antenna
b) Grid antenna c) Sectored antenna d) Omnidirectional antenna
Anonymous Quiz
22%
A
41%
B
22%
C
16%
D
Which type of antenna is used for edge excited cells?
a) Omnidirectional antenna
b) Grid antenna c) Sectored directional antenna d) Dipole antenna
a) Omnidirectional antenna
b) Grid antenna c) Sectored directional antenna d) Dipole antenna
Anonymous Quiz
22%
A
28%
B
28%
C
22%
D
What is a cluster in a cellular system?
a) Group of frequencies
b) Group of cells c) Group of subscribers d) Group of mobile systems
a) Group of frequencies
b) Group of cells c) Group of subscribers d) Group of mobile systems
Anonymous Quiz
25%
A
47%
B
14%
C
14%
D
. A perfect semiconductor crystal containing no impurities or lattice defects is called as __________
a) Intrinsic semiconductor
b) Extrinsic semiconductor c) Excitation d) Valence electron
a) Intrinsic semiconductor
b) Extrinsic semiconductor c) Excitation d) Valence electron
Anonymous Quiz
59%
A
24%
B
17%
C
0%
D
The energy-level occupation for a semiconductor in thermal equilibrium is described by the __________
a) Boltzmann distribution function
b) Probability distribution function c) Fermi-Dirac distribution function d) Cumulative distribution function
a) Boltzmann distribution function
b) Probability distribution function c) Fermi-Dirac distribution function d) Cumulative distribution function
Anonymous Quiz
26%
A
4%
B
67%
C
4%
D
_________________ is used when the optical emission results from the application of electric field.
a) Radiation
b) Efficiency c) Electro-luminescence d) Magnetron oscillator
a) Radiation
b) Efficiency c) Electro-luminescence d) Magnetron oscillator
Anonymous Quiz
32%
A
7%
B
50%
C
11%
D
The recombination in indirect band-gap semiconductors is slow.
a) True
b) False
a) True
b) False
Anonymous Quiz
69%
A
31%
B
👍1👏1
Which impurity is added to gallium phosphide to make it an efficient light emitter?
a) Silicon
b) Hydrogen c) Nitrogen d) Phosphorus
a) Silicon
b) Hydrogen c) Nitrogen d) Phosphorus
Anonymous Quiz
23%
A
13%
B
10%
C
53%
D
How many types of hetero-junctions are available?
a) Two
b) One c) Three d) Four
a) Two
b) One c) Three d) Four
Anonymous Quiz
30%
A
30%
B
33%
C
7%
D
Stimulated emission by recombination of injected carriers is encouraged in __________
a) Semiconductor injection laser
b) Gas laser c) Chemist laser d) Dye laser
a) Semiconductor injection laser
b) Gas laser c) Chemist laser d) Dye laser
Anonymous Quiz
50%
A
35%
B
15%
C
0%
D
Gain guided laser structure are __________
a) Chemical laser
b) Gas laser c) DH injection laser d) Quantum well laser
a) Chemical laser
b) Gas laser c) DH injection laser d) Quantum well laser
Anonymous Quiz
17%
A
21%
B
38%
C
25%
D
Laser modes are generally separated by few __________
a) Tenths of micrometer
b) Tenths of nanometer c) Tenths of Pico-meter d) Tenths of millimeter
a) Tenths of micrometer
b) Tenths of nanometer c) Tenths of Pico-meter d) Tenths of millimeter
Anonymous Quiz
7%
A
41%
B
44%
C
7%
D
Which of the following technology distributes the coverage of the cell and extends the cell boundary to hard-to-reach places?
a) Sectoring
b) Cell splitting c) Micro cell zone concept d) Scattering
a) Sectoring
b) Cell splitting c) Micro cell zone concept d) Scattering
Anonymous Quiz
17%
A
34%
B
24%
C
24%
D
Which of the following do not undergo free space propagation?
a) Wired telephone systems
b) Wireless line of sight radio links c) Microwave line of sight radio links d) Satellite communication system
a) Wired telephone systems
b) Wireless line of sight radio links c) Microwave line of sight radio links d) Satellite communication system
Anonymous Quiz
41%
A
24%
B
14%
C
21%
D
Which of the most widely used model for signal prediction in urban areas?
a) Okumura model
b) Attenuation factor model c) Ericsson Multiple Breakpoint Model d) Log distance path loss model
a) Okumura model
b) Attenuation factor model c) Ericsson Multiple Breakpoint Model d) Log distance path loss model
Anonymous Quiz
17%
C
29%
B
29%
A
25%
D
Which of the following is not an effect caused by multipath in radio channel?
a) Random frequency modulation
b) Time dispersion c) Rapid changes in signal strength d) Power of base station
a) Random frequency modulation
b) Time dispersion c) Rapid changes in signal strength d) Power of base station
Anonymous Quiz
31%
A
31%
B
15%
C
23%
D
Which of the following is not a principle shape factor?
a) Azimuthal direction of maximum fading
b) Angle of arrival c) Angular spread d) Angular constriction
a) Azimuthal direction of maximum fading
b) Angle of arrival c) Angular spread d) Angular constriction
Anonymous Quiz
42%
A
29%
B
21%
C
8%
D
Which of the following is the ratio of the throughput data rate per Hertz?
a) Spectral density
b) Bandwidth efficiency c) Power density d) Power efficiency
a) Spectral density
b) Bandwidth efficiency c) Power density d) Power efficiency
Anonymous Quiz
7%
A
57%
B
25%
C
11%
D
Which of the following is not a linear modulation technique?
a) π/4 QPSK
b) OQPSK c) BPSK d) FSK
a) π/4 QPSK
b) OQPSK c) BPSK d) FSK
Anonymous Quiz
38%
A
22%
B
28%
C
13%
D