Question 1

Which microwave oscillator is widely used in microwave ovens?

Accepted Answer

A)  Magnetron oscillator 
B)  Gunn oscillator 
C)  a traveling wave tube oscillator (TWT) 
D)  Klystron oscillator 
A)  Magnetron oscillator 
B)  Gunn oscillator 
C)  a traveling wave tube oscillator (TWT) 
D)  Klystron oscillator A

Question 2

Which of the following is not a vacuum tube?

Accepted Answer

A)  Gunn oscillator 
B)  Klystron oscillator 
C)  Magnetron oscillator 
D)  traveling wave tube (TWT) oscillator 
E)  all of the above 
A)  Gunn oscillator 
B)  Klystron oscillator 
C)  Magnetron oscillator 
D)  traveling wave tube (TWT) oscillator 
E)  all of the above A

Question 3

Special ferrites that are typically used as RF chokes are called:

Accepted Answer

A)  isolators. 
B)  beads. 
C)  yigs. 
D)  circulators. 
A)  isolators. 
B)  beads. 
C)  yigs. 
D)  circulators. B

Question 4

A transphasor is:

Accepted Answer

A)  an optical switch. 
B)  a fiber optic amplifier. 
C)  a type of maser. 
D)  all of the above. 
A)  an optical switch. 
B)  a fiber optic amplifier. 
C)  a type of maser. 
D)  all of the above.

Question 5

An apparatus whose theory of operation is based upon motion of electrons under the influence of combined E field and H field is known as a(n):

Accepted Answer

A)  TWT oscillator. 
B)  Gunn oscillator. 
C)  Magnetron oscillator. 
D)  Klystron oscillator. 
A)  TWT oscillator. 
B)  Gunn oscillator. 
C)  Magnetron oscillator. 
D)  Klystron oscillator.

Question 6

Parametric amplifiers that have pump frequencies that are double the signal frequency are operating in the:

Accepted Answer

A)  quantum mode 
B)  nondegenerate mode. 
C)  superconductive mode. 
D)  degenerate mode. 
A)  quantum mode 
B)  nondegenerate mode. 
C)  superconductive mode. 
D)  degenerate mode.

Question 7

What material is most useful in the design of masers for low-noise microwave amplification?

Accepted Answer

A)  ruby 
B)  manganese 
C)  gallium arsendide 
D)  ammonia 
A)  ruby 
B)  manganese 
C)  gallium arsendide 
D)  ammonia

Question 8

The purpose of the low-loss dielectric material (radome) used to cover the dish is:

Accepted Answer

A)  for protection. 
B)  for maintenance of internal pressure. 
C)  to improve performance. 
D)  A and B 
A)  for protection. 
B)  for maintenance of internal pressure. 
C)  to improve performance. 
D)  A and B

Question 9

Which of the following is similar to an IMPATT diode?

Accepted Answer

A)  TRAPATT diode 
B)  Baritt diode 
C)  Gunn diode 
D)  tunnel diode 
A)  TRAPATT diode 
B)  Baritt diode 
C)  Gunn diode 
D)  tunnel diode

Question 10

Which of the following is not an application of a ferrite?

Accepted Answer

A)  isolator 
B)  oscillator 
C)  attenuator 
D)  Faraday rotation 
A)  isolator 
B)  oscillator 
C)  attenuator 
D)  Faraday rotation

Question 11

Why are microwave antennas characterized by high gain and high directivity?

Accepted Answer

A)  because there is no need for omnidirectional antennas since all microwave links are point-to-point 
B)  microwave transmitters are very limited in their output power 
C)  since device noise is greater at these frequencies, receivers require larger input signals. 
D)  because of the short wavelengths involved, the physical sizes required are enough for designs not practical at lower frequencies. 
E)  all of the above 
A)  because there is no need for omnidirectional antennas since all microwave links are point-to-point 
B)  microwave transmitters are very limited in their output power 
C)  since device noise is greater at these frequencies, receivers require larger input signals. 
D)  because of the short wavelengths involved, the physical sizes required are enough for designs not practical at lower frequencies. 
E)  all of the above

Question 12

Degenerate mode parametric amplifiers operate with pump frequencies:

Accepted Answer

A)  two times the signal frequency. 
B)  other than two times signal frequency. 
C)  equal to zero. 
D)  same as signal frequency. 
A)  two times the signal frequency. 
B)  other than two times signal frequency. 
C)  equal to zero. 
D)  same as signal frequency.

Question 13

Which microwave oscillator is becoming obsolete due to its large size and the complex, costly sources of dc required for its operation?

Accepted Answer

A)  Klystron oscillator 
B)  Gunn oscillator 
C)  a traveling wave tube oscillator (TWT) 
D)  Magnetron oscillator 
A)  Klystron oscillator 
B)  Gunn oscillator 
C)  a traveling wave tube oscillator (TWT) 
D)  Magnetron oscillator

Question 14

A microwave semiconductor that is typically used as T/R switches in RF transceivers operating above 100 MHz is the:

Accepted Answer

A)  Gunn diode. 
B)  IMPATT diode. 
C)  GaAs FET transistor. 
D)  P-I-N diode. 
A)  Gunn diode. 
B)  IMPATT diode. 
C)  GaAs FET transistor. 
D)  P-I-N diode.

Question 15

Which of the following is also known as a backward-wave oscillator (BWO)?

Accepted Answer

A)  Klystron oscillator. 
B)  Magnetron oscillator. 
C)  TWT oscillator. 
D)  Gunn oscillator. 
A)  Klystron oscillator. 
B)  Magnetron oscillator. 
C)  TWT oscillator. 
D)  Gunn oscillator.

Question 16

Above 5 GHz, which device offers greater performance?

Accepted Answer

A)  silicon FETs 
B)  GaAs FETs 
C)  bipolars 
D)  none of the above 
A)  silicon FETs 
B)  GaAs FETs 
C)  bipolars 
D)  none of the above

Question 17

Calculate the power gain of a microwave dish antenna with a 6 meter mouth diameter when used at 5 GHz.

Accepted Answer

A)  47.8 dB 
B)  27.8 dB 
C)  55.6 dB 
D)  95.6 dB 
A)  47.8 dB 
B)  27.8 dB 
C)  55.6 dB 
D)  95.6 dB

Question 18

The model of a RF capacitor shows that the capacitor is:

Accepted Answer

A)  resistive 
B)  inductive 
C)  capacitive 
D)  all of the above 
A)  resistive 
B)  inductive 
C)  capacitive 
D)  all of the above

Which microwave oscillator is widely used in microwave ovens?

Which of the following is not a vacuum tube?

Special ferrites that are typically used as RF chokes are called:

A transphasor is:

An apparatus whose theory of operation is based upon motion of electrons under the influence of combined E field and H field is known as a(n):

Parametric amplifiers that have pump frequencies that are double the signal frequency are operating in the:

What material is most useful in the design of masers for low-noise microwave amplification?

The purpose of the low-loss dielectric material (radome) used to cover the dish is:

Which of the following is similar to an IMPATT diode?

Which of the following is not an application of a ferrite?

Why are microwave antennas characterized by high gain and high directivity?

Degenerate mode parametric amplifiers operate with pump frequencies:

Which microwave oscillator is becoming obsolete due to its large size and the complex, costly sources of dc required for its operation?

A microwave semiconductor that is typically used as T/R switches in RF transceivers operating above 100 MHz is the:

Which of the following is also known as a backward-wave oscillator (BWO)?

Above 5 GHz, which device offers greater performance?

Calculate the power gain of a microwave dish antenna with a 6 meter mouth diameter when used at 5 GHz.

The model of a RF capacitor shows that the capacitor is:

Introductory Topics

Amplitude Modulation: Transmission

Amplitude Modulation: Reception

Single-Sideband Communications

Frequency Modulation: Transmission

Frequency Modulation: Reception

Communications Techniques

Digital Communications: Coding Techniques

Wired Digital Communications

Wireless Digital Communications

Network Communications

Transmission Lines

Wave Propagation

Antennas

Waveguides and Radar

Television

Fiber Optics

Filters

Exam 16: Microwaves and Lasers

Which microwave oscillator is widely used in microwave ovens?

Which of the following is not a vacuum tube?

Special ferrites that are typically used as RF chokes are called:

A transphasor is:

An apparatus whose theory of operation is based upon motion of electrons under the influence of combined E field and H field is known as a(n):

Parametric amplifiers that have pump frequencies that are double the signal frequency are operating in the:

What material is most useful in the design of masers for low-noise microwave amplification?

The purpose of the low-loss dielectric material (radome) used to cover the dish is:

Which of the following is similar to an IMPATT diode?

Which of the following is not an application of a ferrite?

Why are microwave antennas characterized by high gain and high directivity?

Degenerate mode parametric amplifiers operate with pump frequencies:

Which microwave oscillator is becoming obsolete due to its large size and the complex, costly sources of dc required for its operation?

A microwave semiconductor that is typically used as T/R switches in RF transceivers operating above 100 MHz is the:

Which of the following is also known as a backward-wave oscillator (BWO)?

Above 5 GHz, which device offers greater performance?

Calculate the power gain of a microwave dish antenna with a 6 meter mouth diameter when used at 5 GHz.

The model of a RF capacitor shows that the capacitor is:

Introductory Topics

Amplitude Modulation: Transmission

Amplitude Modulation: Reception

Single-Sideband Communications

Frequency Modulation: Transmission

Frequency Modulation: Reception

Communications Techniques

Digital Communications: Coding Techniques

Wired Digital Communications

Wireless Digital Communications

Network Communications

Transmission Lines

Wave Propagation

Antennas

Waveguides and Radar

Television

Fiber Optics

Filters