CMR COLLEGE OF ENGINEERING & TECHNOLOGY

(Autonomous)

ELECTRONICS AND COMMUNICATION ENGINEERING

TUTORIAL QUESTION BANK

Blooms Course
Course
S. No QUESTION Taxonomy learning
Outcomes
Level Outcome
UNIT-I

PART-A (SHORT ANSWER QUESTIONS)

1 List the typical applications of microwaves. Remember CO 1 AEC015.01
2 Define the dominant mode of a waveguide? Remember CO 1 AEC015.01
3 What are microwaves? Why they are so called? Remember CO 1 AEC015.01
4 Define waveguide? Mention some of its features? Remember CO 1 AEC015.01
5 What is TE, TM & TEM modes? Remember CO 1 AEC015.01
6 Define dominant mode and degenerate mode? Remember CO 1 AEC015.02
7 Define cutoff frequency of a waveguide. Remember CO 1 AEC015.02
What is dominant mode of a rectangular waveguide for Remember CO 1 AEC015.02
8
TE and TM modes and why?
9 Explain briefly about impossibility of TEM Modes. Understand CO 1 AEC015.02
10 Name the microwave frequency bands and spectrums. Remember CO 1 AEC015.01
11 Define phase velocity. Remember CO 1 AEC015.03
12 What is meant by group velocity? Remember CO 1 AEC015.03
What is the relation between phase and group velocities Understand CO 1 AEC015.03
13
in terms of light velocity?
14 Define guide wavelength. Remember CO 1 AEC015.03
15 Summarize the advantages of microwaves. Understand CO 1 AEC015.01
16 Define wave impedance? Remember CO 1 AEC015.03
17 Define cavity resonator? Remember CO 1 AEC015.04
18 What are different types of cavity resonators are there? Remember CO 1 AEC015.04
19 Define Rectangular cavity resonator? Remember CO 1 AEC015.04
20 Discuss about resonant frequencies? Understand CO 1 AEC015.05
PART-B (LONG ANSWER QUESTIONS)
1 Derive the TMmn mode field equation in rectangular Create CO 1
AEC015.02
waveguide.
2 Derive the TEmn mode field equation in rectangular Create CO 1
AEC015.02
waveguide
3 What are the dominated and degenerate modes? What is Understand CO 1 AEC015.02
the significance of dominant modes? Indicate the
dominant mode in rectangular wave guide and calculate
fc for the same.
4 Formulate the expressions for cut off frequency, phase Apply CO 1 AEC015.03
constant, in a rectangular wave guide.
5 What is a Microwave spectrum bands? Explain briefly Understand CO 1 AEC015.01
the applications of microwaves at various frequency
bands.
6 Explain the wave impedance of a rectangular waveguide Understand CO 1 AEC015.03
and derive the expression for the wave impedance of TE
mode.
7 Derive the expression for cutoff frequency of TEmn Create CO 1 AEC015.02
mode in rectangular wave guide.
8 Derive the TMmnp mode field equation in rectangular Create CO 1 AEC015.04
cavity resonator
9 Derive the TEmnp mode field equation in rectangular Create CO 1 AEC015.04
cavity resonator
10 Derive the cut-off frequency expression for Rectangular Create CO 1 AEC015.04
cavity resonator
11 Formulate the expressions group velocity, Phase Apply CO 1 AEC015.03
velocity and wave impedance in A rectangular wave
guide
12 Derive the expression for cutoff frequency of TMmn Create CO 1 AEC015.02
mode in rectangular wave guide.
13 List the advantages of microwaves briefly. Remember CO 1 AEC015.01
14 Explain the wave impedance of a rectangular waveguide Understand CO 1 AEC015.03
and derive the expression for the wave impedance of
TM mode.
15 Derive the field components of TE Waves in Create CO 1 AEC015.02
Rectangular waveguide?
16 Derive the field components of TE Waves in Create CO 1 AEC015.02
Rectangular waveguide?
17 How many types of waveguides are there? Explain them Understand CO 1 AEC015.01
briefly?
18 Draw the field patterns for any three modes in TE Mode Apply CO 1 AEC015.03
for a rectangular waveguide?
19 Draw the field patterns for any three modes in TM Apply CO 1 AEC015.03
Mode for a rectangular waveguide?
20 Explain about different coupling mechanisms in Understand CO 1 AEC015.04
Rectangular cavity resonator?
PART-C (PROBLEM SOLVING AND CRITICAL THINKING QUESTIONS)
1 Show that the TM01 and TM10 modes in rectangular Apply CO 1 AEC015.02
waveguide do not exist.
2 An air-filled rectangular waveguide has dimensions of a Apply CO 1 AEC015.02
= 6 cm and b = 4 cm. The signal frequency is 3 GHz.
Compute the following for the TE10 and TM11 modes:
(a) Cut-off frequency (b) Wavelength in the waveguide
(c) Phase constant and phase velocity (d) Group velocity
in the waveguide.
3 The dimensions of a rectangular waveguide are a = 2.5 Apply CO 1 AEC015.02
cm and
b = 1 em. The signal frequency is 8.6 GHz. The
determine the following: (a) Possible modes (b) Cut-off
frequencies.
4 A rectangular waveguide has a = 4 cm and b = 3 cm. Apply CO 1 AEC015.02
Find all the possible modes of propagation at signal
frequency of 5 GHz.
5 For a dominant mode in an air filled rectangular Apply CO 1 AEC015.02
waveguide, for a signal frequency of 9 GHz and guide
wavelength is 4 cm. Determine the dimension of the
waveguide.
6 A rectangular waveguide is filled by dielectric material Apply CO 1 AEC015.03
of E r = 9 and has inside dimensions of 7 x 3.5 cm. It
operates in the dominant TE10 mode. Then determine
(a) Cut-off frequency (b) Phase velocity in the guide at
frequency of 2 GHz (c) Guide wavelength A.9 at the
same frequency.
7 A rectangular waveguide operating in dominant mode Apply CO 1 AEC015.03
having breath 10 cm for 2.5 GHz signal propagated in
this waveguide. Determine the group, phase velocities
and guide wavelength
8 Calculate the cut-off frequency of the following modes Apply CO 1 AEC015.03
in a square waveguide 4 cm × 4 cm (i) TE10 (ii) TE11
(iii) TE22
9 (a) A common air filled rectangular X band waveguide Apply CO 1 AEC015.03
has the interior dimensions a = 2.29 cm and b = 1.0 cm.
Find the cut-off frequency of the lower order, nontrival
TM mode.
(b) If a source frequency which is twice the cut-off value
found in (a), determine the propagating constant for the
mode. Also obtain the wavelength in the guide, phase
velocity and intrinsic wave impedance.
10 A 6 GHz signal is to be propagated in the dominant Apply CO 1 AEC015.03
mode in a rectangular waveguide. If group velocity is to
be 90% of the free space velocity of light. What must be
the breath of the waveguide? What impedance will be
offer to this signal, if it is correctly matched?
UNIT-II
PART-A(SHORT ANSWER QUESTIONS)
1 Explain the waveguide discontinuities? Remember CO 2 AEC015.06
2 Mention the applications of Hybrid Tee junction? Remember CO 2 AEC015.07
3 What is meant by Isolator? Remember CO 2 AEC015.08
4 What is meant Gyrator? Remember CO 2 AEC015.08
5 Describe the principle of working of a wave guide Understand CO 2 AEC015.08
attenuator, with neat schematics?
6 List out the different types of waveguide Irises? Remember CO 2 AEC015.06
7 Write short notes on Ferrite Devices? Understand CO 2 AEC015.08
8 How many types of microwave junctions are there? Apply CO 2 AEC015.07
9 Distinguish between an isolator and a gyrator understand CO 2 AEC015.08
10 What is the need of S-Matrix Understand CO 2 AEC015.07
11 Describe about probe and loop coupling mechanisms in Understand CO 2 AEC015.07
rectangular cavity resonator?
12 What is meant circulator? Understand CO 2 AEC015.08
13 Write the applications of circulator? Understand CO 2 AEC015.08
14 Explain faraday rotation principle? Understand CO 2 AEC015.08
15 Define attenuator? Remember CO 2 AEC015.08
16 Define phase shifter? Remember CO 2 AEC015.08
17 How many types of attenuators are there in rectangular Remember CO 2 AEC015.08
waveguide?
18 How many types of phase shifters are there in Remember CO 2 AEC015.07
rectangular waveguide?
19 What are the applications of magic tee? Understand CO 2 AEC015.07
20 Why E-H Plane tee junction is called as magic tee? Understand CO 2 AEC015.07
PART-B (LONG ANSWER QUESTIONS)
1 Write about quality factor of a cavity resonator. Understand CO 2 AEC015.06
2 Discuss the principle of working an H-plane Tee junction Understand CO 2 AEC015.07
with neat schematics.
3 Discuss in detail about the principle of working an E- Understand CO 2 AEC015.07
plane Tee junction with neat schematics?
4 Explain the principle of working a Magic Tee junction Understand CO 2 AEC015.07
with neat schematics?
5 Discuss about E-H plane Tee junction. Why a hybrid E- Understand CO 2 AEC015.07
H plane Tee referred to as Magic Tee. Derive the
scattering matrix for E-H plane Tee junction.
6 Write short notes on: Wave guide Irises Understand CO 2 AEC015.06
7 Discuss about tuning screws and posts Understand CO 2 AEC015.06
8 Describe about various types of Attenuators? Understand CO 2 AEC015.06
9 Describe about various types of Phase shifters? Understand CO 2 AEC015.06
10 Discuss the principle of working a Hybrid ring with neat Understand CO 2 AEC015.07
schematics.
11 Discuss about gyrator with neat diagrams? Understand CO 2 AEC015.08
12 Discuss about circulator with neat diagrams? Understand CO 2 AEC015.08
13 Discuss about isolator with neat diagrams? Understand CO 2 AEC015.08
14 Explain about Ferrite components and faraday rotation Understand CO 2 AEC015.08
principle?
15 Explain about Rotatory vane type of phase shifters Understand CO 2 AEC015.08
16 Explain about Rotatory vane type of phase shifters Understand CO 2 AEC015.08
17 Explain in detail about wave guide discontinuities? Understand CO 2 AEC015.06
18 With the help of block diagrams explain about the Understand CO 2 AEC015.07
applications of magic tee?
19 What is the need of microwave junction and derive s- Understand CO 2 AEC015.07
matrix with the help of two port network?
20 What is the need of attenuators and phase shifters in Understand CO 2 AEC015.08
rectangular waveguide?
PART-C (PROBLEM SOLVING AND CRITICAL THINKING QUESTIONS)
1 Prove that it is impossible to construct a perfectly Apply CO 2 AEC015.07
matched lossless, reciprocal three-port junction
2 An isolator has an insertion loss of 0.5 dB and an Apply CO 2 AEC015.08
isolation of 30 dB. Determine the scattering matrix of the
isolator if the isolated ports are perfectly matched to
junction
A three-port circulator has an insertion loss of 1 dB, Apply CO 2 AEC015.08
3
isolation 30 dB and VSWR is 1.5. Find the S-matrix.
4 Show that E-plane acts as a 3 dB splitter Apply CO 2 AEC015.07
5 The collinear ports (1) and (2) of magic tee are Apply CO 2 AEC015.07
terminated by impedances of reflection coefficients ρ1 =
0.5 and ρ2 = 0.6. The difference port (4) is terminated by
an impedance with reflection coefficient of 0.8. If 1 watt
power is fed at sum port (3), calculate the power
reflected at port (3) and power divisions at the other
ports
6 Show that H-plane acts as a 3 dB splitter Apply CO 2 AEC015.07
A three-port circulator has an insertion loss of 10 dB, Apply CO 2 AEC015.08
7
isolation 30 dB and VSWR is 1.5. Find the S-matrix.
8 An isolator has an insertion loss of 0.8 dB and an Apply CO 2 AEC015.08
isolation of 40 dB. Determine the scattering matrix of the
isolator if the isolated ports are perfectly matched to
junction
An attenuator of 20dB is fed with 100w input. Find the Apply CO 2 AEC015.06
9
output power of the attenuator.
An attenuator of 40dB is fed with 100w input. Find the Apply CO 2 AEC015.06
10
output power of the attenuator.
UNIT-III & IV
PART-A(SHORT ANSWER QUESTIONS)
1 State the limitations of conventional tubes at microwave Remember CO 3 AEC015.09
frequencies.
2 What is the principle of two cavity Klystron amplifier? Remember CO 3 AEC015.10
What are the applications of reflex klystron? Remember CO 3 AEC015.11
3
State the characteristics of the two-cavity klystron Remember CO 3 AEC015.10
4
amplifier.
5 Compare TWT& Klystron amplifier. Understand CO 3 AEC015.12
Draw the schematic diagram of helix travelling wave Understand CO 3 AEC015.12
6
tube?
7 What is meant by reflex klystron? Remember CO 3 AEC015.11
What are the performance characteristics of klystron Remember CO 3 AEC015.10
8
amplifier?
9 Differentiate between klystrons and TWT. Understand CO 3 AEC015.12
State the applications of the two-cavity klystron Remember CO 3 AEC015.10
10
amplifier.
11 Why multi-cavity klystrons are preferred? Remember CO 3 AEC015.10
12 How are oscillations avoided in travelling wave tube? Remember CO 3 AEC015.08
Discuss in detail about lead inductance and inter Remember CO 3 AEC015.08
13 electrode capacitance effects of conventional tubes at
microwave frequencies.
14 Differentiate between O – type tubes and M – type tubes. Understand CO 3 AEC015.12
What is the condition for obtaining the power output in Understand CO 3 AEC015.11
15
reflex klystron?
16 Explain mechanical tuning of reflex klystron? Understand CO 3 AEC015.11
17 Explain electronic tuning of reflex klystron Understand CO 3 AEC015.11
18 Explain the operating principle of reflex klystron? Understand CO 3 AEC015.11
19 Derive the power output of a reflex klystron Understand CO 3 AEC015.11
20 Explain frequency pushing in magnetron Remember CO 3 AEC015.14
PART-B (LONG ANSWER QUESTIONS)
1 Explain is the principle of working for Two – Cavity Understand CO 3 AEC015.10
Klystron with velocity diagram.
2 Derive the expression for output power & Efficiency Analyze CO 3 AEC015.10
of a Two cavity klystron.
3 Explain in detail bunching process & obtain Apply CO 3 AEC015.10
expression for bunching parameter in a two cavity
klystron amplifier.
4 What are the limitations of conventional tubes at Analyze CO 3 AEC015.09
microwave frequencies? Explain how these limitations
can be overcome.
5 Explain the construction & working of 8-Cavity Understand CO 3 AEC015.14
magnetron and also explain hull cut off and hartree
conditions
6 Name different methods of generating microwave Apply CO 3 AEC015.11
power. Describe the necessary theory & Working of
reflex klystron.
7 Explain the operation of TWT With the help of Analyze CO 3 AEC015.12
constructional diagram.
8 Explain the principle of operation of a reflex Klystron Analyze CO 3 AEC015.11
oscillator and derive an expression for the bunching
parameter.
9 Explain the construction & working of two cavity Understand CO 3 AEC015.10
klystron amplifier.
10 Explain the construction & working of Magnetron. Understand CO 3 AEC015.13
11 Explain mathematical analysis of two cavity klystron Understand CO 3 AEC015.10
amplifier in detail.
12 Derive the equation for beam coupling coefficient of Analyze CO 3 AEC015.10
the input cavity in two cavity klystron.
13 Derive the equation for depth of velocity modulation Analyze CO 3 AEC015.10
in two cavity klystron.
14 Explain the bunching parameter of klystron Understand CO 3 AEC015.10
15 Derive the output power of klystron with equivalent Analyze CO 3 AEC015.10
circuit of catcher cavity
16 Derive the expression for efficiency of reflex klystron Analyze CO 3 AEC015.11
and compare with two cavity klystron
17 Derive a relationship between accelerating voltage and Analyze CO 3 AEC015.11
repeller voltage in reflex klystron
18 Explain the purpose of attenuator in travelling wave Understand CO 3 AEC015.12
tube amplifier
19 Explain the efficiency improvement methods in Understand CO 3 AEC015.12
travelling wave tube amplifier
20 Compare travelling wave tube amplifier with two Understand CO 3 AEC015.12
cavity klystron amplifier
PART-C (PROBLEM SOLVING AND CRITICAL THINKING QUESTIONS)
1 A reflex klystron is operating at 100 GHz. If the mode Apply CO 3 AEC015.11
operating in the tube corresponds to integer n = 3,
determine the transit time of the electron in the repeller
space
2 The operating frequency of reflex klystron is 2 GHz. Apply CO 3 AEC015.11
Calculate the change in frequency for a 2% change in the
repeller voltage given that; Repeller voltage = 2000 V
Accelerating voltage = 500 V Space between exit of the
gap and repeller electrode = 2 cm (Assume that the
operation is for n = 1)
3 A reflex klystron operates at the peak of the n = 1 or 3/4 Apply CO 3 AEC015.11
mode. The DC power input is 40 mW and the ratio of
V1 over V0 is 0.278 (a) Determine the efficiency of the
reflex klystron. (b) Find the total output power in mW.
(c) If 20% of the power delivered by the electron beam
is dissipated in the cavity walls, find the power delivered
to the load.
4 A reflex klystron operates at the peak of the n = 1 or 3/4 Apply CO 3 AEC015.11
mode. The DC power input is 40 mW and the ratio of
V1 over V0 is 0.278 (a) Determine the efficiency of the
reflex klystron. (b) Find the total output power in mW.
(c) If 20% of the power delivered by the electron beam
is dissipated in the cavity walls, find the power delivered
to the load.
5 A reflex klystron operates at the peak mode n = 2 with Apply CO 3 AEC015.12
Beam voltage V0 = 300 V Beam current I0 = 20 mA
Signal voltage V1 = 40 V Determine: (a) The input
power (b) The output power (c) The efficiency.
6 A helical TWT has a circumference (of helix) to pitch Apply CO 3 AEC015.12
ratio of 10. Determine the anode voltage for which the
TWT can be operated for any useful gain.
7 A helix travelling wave tube operates at 4 GHz under a Apply CO 3 AEC015.12
beam voltage V0 = 6 kV and beam current I0 = 30 mA.
If the helix impedance Z0 is 100 ohm and circuit length
N = 30, find the output power gain.
8 An O-type travelling wave tube operates at 2 GHz. The Apply CO 3 AEC015.12
slow wave structure has pitch angle of 5.7°. Determine
the propagation constant of the travelling wave in the
tube. It is assumed that the tube is lossless.
 9 Determine the following in case of an 8 resonator Apply CO 3 AEC015.13
travelling wave magnetron. (a) Phase difference between
adjacent resonators in general. (b) Number of possible
modes of resonance. (c) Number of useful modes of
resonance. (d) Value of integer (n) for the most dominant
mode
10 An X-band pulsed cylindrical magnetron has V0 = 30 Apply CO 3 AEC015.14
kV, I0 = 80 A, B0 = 0.01 wb/m2 , a = 4 cm, b = 8 cm.
Calculate: (i) Cyclotron angular frequency (ii) Cut-off
voltage (iii) Cut-off magnetic flux density.
UNIT-V
PART-A(SHORT ANSWER QUESTIONS)
1 What is transferred electron effect? Remember CO 4 AEC015.15
2 What is negative resistance in Gunn diode? Remember CO 4 AEC015.16
What are the applications of Microwave Solid-State CO 4
3 Understand AEC015.15
Devices?
4 What are the elements that exhibit Gunn Effect? Understand CO 4 AEC015.16
5 Mention the applications of Gunn diode amplifier. Remember CO 4 AEC015.16
6 What is GUNN effect? Remember CO 4 AEC015.16
7 Explain transferred electron effect. Understand CO 4 AEC015.15
8 What is the principle of TRAPATT diode? Understand CO 4 AEC015.17
9 What is the principle of IMPATT diode? Remember CO 4 AEC015.17
10 What is the principle of BARITT diode? Remember CO 4 AEC015.17
11 Write short notes on “LSA mode in GUNN diode”. Understand CO 4 AEC015.16
12 What are the limitations of LSA modes of Gunn diodes? Remember CO 4 AEC015.17
13 Compare IMPATT and TRAPATT diodes. Understand CO 4 AEC015.17
Differentiate between transferred electron devices and CO 4
14 Understand AEC015.16
transistors.
15 What are the Applications of MESFET? Remember CO 4 AEC015.17
What are the applications and advantages of various CO 4
16 Understand AEC015.16
solid state devices?
17 Explain working of varactor diode. Remember CO 4 AEC015.17
18 Explain the working of IMPATT. Understand CO 4 AEC015.17
19 Explain the working of PIN diode. Understand CO 4 AEC015.16
What is the advantage of double drift region over single CO 4
20 Understand AEC015.15
drift region?
PART-B (LONG ANSWER QUESTIONS)
1 What is meant by Avalanche Transit Time Devices? Understand CO 4 AEC015.17
Explain the Operation, construction and Applications of
IMPATT.
2 Explain avalanche transit time devices. Remember CO 4 AEC015.16
3 Explain Gunn effect using the two valley theory. Understand CO 4 AEC015.15
Derive the criterion for classifying the modes of CO 4
4 Remember AEC015.15
operation for Gunn effect diodes.
5 Describe the operation of IMPATT diode. Understand CO 4 AEC015.17
6 Explain the physical structure and construction of Understand CO 4 AEC015.17
IMPATT diodes.
7 Write short notes on “LSA mode in GUNN diode”. Remember CO 4 AEC015.16
8 Derive the criterion for classifying the modes of Remember CO 4 AEC015.16
operation for Gunn effect diodes.
9 Describe the operation of TRAPATT diode. Remember CO 4 AEC015.17
10 Describe the operation of BARITT diode. Understand CO 4 AEC015.17
11 Explain the working of any two of the following: Understand CO 4 AEC015.17
(i) IMPATT
(ii) Varactor diode.
(iii) PIN diode.
12 What is the relevance of different modes of operation in Remember CO 4 AEC015.16
Gunn diode?
13 What is varactor diode? Discuss its two applications. Understand CO 4 AEC015.15
How TRAPATT can be designed using IMPATT and
how it is important?
14 How avalanche effect is utilized to generate microwave Understand CO 4 AEC015.17
signals? Explain the operation of TRAPATT.
15 What is an IMPATT diode? Draw the schematic diagram Remember CO 4 AEC015.16
and equivalent circuit of the IMPATT diode?
16 Describe the basic operating mechanism of TRAPATT Understand CO 4 AEC015.15
diode using a suitable sketch. Why is drift through this
diode much slower than through a comparable IMPATT
diode?
17 What does acronym IMPATT stand for? Why does the Understand CO 4 AEC015.17
device show a differential negative resistance? Give the
physical structure, doping profile and electric field
distribution of a double drift region IMPATT diode.
18 How avalanche effect is utilized to generate microwave Remember CO 4 AEC015.16
signals? Explain the operation of IMPATT.
19 Draw the band diagram of Ga As and explain the Gunn Understand CO 4 AEC015.15
effect, where by negative resistances and therefore
oscillations are obtained under certain conditions from
bulk gallium arsenide.
20 What is transferred electron effect? In which type of Understand CO 4 AEC015.15
material it is present. How the domain formation is
taking place in Gunn devices and what are its various
modes of operation?
PART-C (PROBLEM SOLVING AND CRITICAL THINKING QUESTIONS)
A Gunn device operates in the transit time mode of 20 Remember CO 4 AEC015.16
1 GHz. If it is fabricated from gallium arsenide, find length
of device. Consider that Vs=10cm/s
An IMPATT diode has a drift length of 2µ m. Determine Remember CO 4 AEC015.17
2 the operating frequency of the IMPATT diode, if the
drift velocity for Si is 107 cms/sec.
Determine the hull cutoff voltage for a given anode Understand CO 4 AEC015.17
3 voltage of 26kv. Assume radiiof cathode and anode
cylinders as 5cm and10cm respectively.
The drift velocity of electron is 2 107 cm/s, through Understand CO 4 AEC015.17
4 the active region of length 10 ฀ 10−4 cm. Calculate the
natural frequency of the diode and the critical voltage.
An n-type GaAs Gunn diode has Electron velocity vd = 3 Remember CO 4 AEC015.16
5
105 m/s Negative electron mobility |µ n| = 0.16 m2 /Vs
Relative dielectric constant εr = 12.9 Determine the
criterion for classifying the modes of operation.
Determine conductivity of an n-type GaAs Gunn diode if Understand CO 4 AEC015.16
6 Electron density n = 1016 cm−3 Electron density at
lower valley nl = 1010 cm−3 Electron density at upper
valley nu = 108 cm−3 Temperature T = 400 K
In Gunn diode’s transit domain mode, the domain Remember CO 4 AEC015.16
7 velocity is equal to the carrier drift velocity and is about
107 cm/sec. Determine the drift length of a diode at a
frequency of 8 GHz.
Calculate the dielectric relaxation time of GaAs Gunn Remember CO 4 AEC015.16
8 diode has the following parameter: Relative dielectric
constant εr = 13 Doping concentration n0 = 1015 cm−3
Mobility µ n = 8500 cm2 /Vs.
 A tunnel diode amplifier has the negative resistance of Remember CO 4 AEC015.16
26 Ω. Now a load of 24 Ω is to be connected to draw the
9 amplified output. Suggest whether the load is to be
connected in series or in parallel to make the gain
maximum.
A tunnel diode has the following parameters: Negative Remember CO 4 AEC015.16
10 resistance = 26 Ω Series resistance = 1 Ω Junction
capacitance = 5 pF Series inductance = 1 mH Calculate
the resistive and reactive cut-off frequencies.
UNIT-V
PART-A(SHORT ANSWER QUESTIONS)
1 Define the method for measuring VSWR<10? Understand CO 5 AEC015.19
What is the principle of microwave frequency Understand CO 5 AEC015.19
2
measurement?
3 State various methods for measuring attenuation? Understand CO 5 AEC015.19
4 Define Voltage standing wave ratio. Remember CO 5 AEC015.19
5 Define Reflection coefficient. Remember CO 5 AEC015.19
List the methods used for measuring the low and high Understand CO 5 AEC015.19
6
VSWR?
7 Write a short notes on power ratio method. Remember CO 5 AEC015.19
8 Discuss about the RF substitution method. Understand CO 5 AEC015.19
9 Write short notes on measurement of phase shift. Understand CO 5 AEC015.19
10 List the devices used in microwave bench setup. Remember CO 5 AEC015.18
11 Define the method for measuring VSWR<10? Remember CO 5 AEC015.19
What is the principle of microwave frequency Understand CO 5
12 AEC015.19
measurement?
Under what conditions double minimum method of Understand CO 5
13 AEC015.19
VSWR is preferred?
14 Define Voltage standing wave ratio Remember CO 5 AEC015.19
Explain in brief about errors in microwave power CO 5
15 Understand AEC015.19
measurement?
16 Define Gunn Power Supply ? Remember CO 5 AEC015.18
17 What is Gunn Oscillator ? Understand CO 5 AEC015.19
18 Define PIN Modulator ? Understand CO 5 AEC015.18
19 Define VSWR meter ? Remember CO 5 AEC015.19
20 Define reflection coefficient ? Understand CO 5 AEC015.18
PART-B (LONG ANSWER QUESTIONS)
1 Explain the measurement of attenuation using power Remember CO 5 AEC015.19
ratio method with neat block diagram?
2 Write about the Slotted line method for impedance Remember CO 5 AEC015.19
measurement.
3 Draw a neat diagram of microwave test bench and Understand CO 5 AEC015.18
explain about each block along with its features.
4 Explain the measurement of microwave power using Apply CO 5 AEC015.19
bolometer method.
5 Discuss the measurement of phase shift using neat Remember CO 5 AEC015.19
block diagram.
6 Explain the method of measurement of high VSWR. Understand CO 5 AEC015.19
7 Explain the RF substitution method of measurement of Understand CO 5 AEC015.19
attenuation.
8 Write about the measurement of quality factor of a Remember CO 5 AEC015.19
cavity resonator.
9 Explain the frequency measurement techniques. Understand CO 5 AEC015.19
10 Discuss the different techniques employed in Remember CO 5 AEC015.19
measuring impedance?
11 Explain the operation of isolator, variable attenuator Remember CO 5 AEC015.18
and frequency meter briefly.
12 Explain the measurement of microwave power using Understand CO 5 AEC015.19
Calorimeter technique.
13 Discuss the method for measuring low voltage Remember CO 5 AEC015.18
standing wave ratio.
14 Explain different types of fixed and variable Remember CO 5 AEC015.18
attenuators briefly.
15 Explain VSWR meter, crystal detector , slotted section Remember CO 5 AEC015.19
and Gunn oscillator.
16 Discuss the measurement of impedance using Understand CO 5 AEC015.18
reflectometer with block diagram
17 Discuss the V-I characteristics of Gunn diode using Remember CO 5 AEC015.19
micro wave bench set up.
18 Discuss the method for measuring high voltage Remember CO 5 AEC015.18
standing wave ratio.
19 Explain the measurement of impedance using slotted Understand CO 5 AEC015.19
line method.
20 Explain the construction and operation of slotted line Remember CO 5 AEC015.18
using diagrams.
PART-C (PROBLEM SOLVING AND CRITICAL THINKING QUESTIONS)
1. The reflection coefficient of a given microwave Remember CO 5 AEC015.19
component is 0.5.Find its VSWR.
2. Find the Q of a cavity resonator, if its resonating Understand CO 5 AEC015.19
frequency and bandwidth are 9 GHz and 1MHz
respectively
3. The input power given to an attenuator is 1000 W. The Understand CO 5 AEC015.19
output power produced by the attenuator is 1W.
Calculate the value of the attenuator
4. Calculate the VSWR of a transmission line operating at Understand CO 5 AEC015.19
10 GHz. Assume TE10 wave propagating inside of a
waveguide of dimensions a = 4 cm, b = 3 cm. The
distance between twice minimum power point is 2 mm
on a slotted line.
5. A slotted line is used to measure VSWR of the load at 8 Understand CO 5 AEC015.19
GHz by double minima method. If the distance between
the positions of twice minimum power is 0.5 cm. Find
the value of VSWR on the line and magnitude of the
voltage reflection coefficient.
6. A slotted line is used to determine the VSWR value of a Understand CO 5 AEC015.19
waveguide. Adjacent null positions are located at 13.31
cm and 15.45 cm on slotted line scale. If the twice
minimum power point is 2 mm. What is the value of
VSWR?
7. Two identical 30 dB directional coupler are used to Understand CO 5 AEC015.19
sample the reflected power in waveguide. If VSWR is 3
and the output of the coupler sampling the incident
power is 5.2 mW. What will be the reflected power?
8. By using reflectometer measurement set-up, Determine Understand CO 5 AEC015.19
the reflection coefficient and VSWR.
9. Two identical 20 dB directional couplers are used in a Understand CO 5 AEC015.19
waveguide to sample the incident and reflected powers.
The output of the forward and reverse directional
coupler are 3.5 mW and 0.25 mW respectively. Find the
VSWR in the waveguide.
10. Find the Q of a cavity resonator, if its resonating Remember CO 5 AEC015.19
frequency and bandwidth are 9 MHz and 1MHz
respectively