Electrical engineering-Microwave Engineering MCQs Set/4 Sample Test,Sample questions

Question:
 If the reflection co efficient of a 2 port network is 0.5 then the return network loss in the network is:

1.6.5 dB

2.0.15 dB

3.6.020 dB

4.10 dB


Question:
 Scattering matrix for a lossless matrix is:

1.Unitary

2.Symmetric

3.Identity matrix

4.Null matrix


Question:
A modern device that replaces a slotted line is:

1.Digital CRO

2.generators

3.network analyzers

4.computers


Question:
A short transmission line stub can be used to provide a shunt capacitance of:

1.0-0.1µF

2.0-0.1pF

3.0-0.1nF

4.1-10pF


Question:
A slotted line can be used to measure _____ and the distance of _____________ from the load.

1.SWR, first voltage minimum

2.SWR, first voltage maximum

3.characteristic impedance, first voltage minimum

4.characteristic impedance, first voltage maximum


Question:
ABCD matrix is used:

1.When there is two or more port networks in the cascade

2.To represent a 2 port network

3.To represent a 2 port network

4.To represent the impedance of a microwave network


Question:
ABCD matrix of the cascade connection of 2 networks is equal to:

1.Product of ABCD matrices representing the individual two ports

2.Sum of the ABCD matrices representing the individual two ports

3.Difference of the ABCD matrices representing the individual two ports

4.Sum of transpose of ABCD matrices representing the individual two ports


Question:
Admittance and impedance matrices of a micro waves network are related as:

1.[Y] = [Z]-1

2.[Y] = [Z]

3.[V] = [Z] [Z]-1

4. [Z] = [V] [V]-1


Question:
An ‘L’ network is required to match a load impedance of 40Ω to a transmission line of characteristic impedance 60Ω. The components of the L network are:

1.28.28+j0 Ω

2.28.28+j1 Ω

3.50Ω

4.48.9Ω


Question:
Fields of TEM mode on strip line must satisfy:

1.Laplace’s equation

2.Ampere’s circuital law

3.Gaussian law

4.None of the mentioned


Question:
For a lossless network, the impedance and admittance matrices are:

1.Real

2.Purely imaginary

3.Complex

4.Rational


Question:
For a reciprocal network, Z matrix is:

1.A unit matrix

2.Null matrix

3.Skew symmetric matrix

4.Symmetric matrix


Question:
For a simple admittance Y, the ABCD parameters are:

1.A=1, B=0, C=Y, D=1

2.A=Z, B=1, C=1, D=0

3.A=1, B=0, C=Z, D=1

4.A=1, Y=B, C=0, D=1


Question:
For most of the micro strip substrates:

1.Conductor loss is more significant than di electric loss

2.Di electric loss is more significant than conductor loss

3.Conductor loss is not significant

4.Di-electric loss is less significant


Question:
For simple impedance Z, the ABCD parameters are:

1.A=1, Z=B, C=0, D=1

2.A=0, B=1, C=1, D=0

3.A=Z, B=1, C=1, D=0

4.A=1, B=0, C=Z, D=1


Question:
If SWR=1.5 with a wavelength of 4 cm and the distance between load and first minima is 1.48cm, then the reflection coefficient is:

1.0.0126+j0.1996

2.0.0128

3.0.26+j0.16

4. none of the mentioned


Question:
If the dielectric material used between the grounded plates of a stripline is 2.2, when the strip line operating at 8 GHz, the wavelength on stripline is:

1.1.2 cm

2.2.52 cm

3.0.15 cm

4.3.2 cm


Question:
If the effective width of the center conductor is 3 mm and the distance between the two ground plates is 0.32 cm with the material of the dielectric used having a relative permittivity of 2.5, then what is the characteristic impedance of the strip line?

1.50Ω

2.71.071Ω

3. 43.24Ω

4.121Ω


Question:
If the loss tangent is 0.001 for a stripline operating at 12 GHz with the relative permittivity of the dielectric material being used equal to 2.6, then the conductor loss is:

1.0.102

2.0.202

3.0.001

4.0.002


Question:
If the reflection co efficient of a 2 port network is 0.25 then the return network loss in the network is:

1.12.05 dB

2.0.15 dB

3.20 dB

4.10 dB


Question:
If the reflection coefficient of a transmission line is 0.4, then the standing wave ratio is:

1.1.3333

2.2.3333

3.0.4

4.0.6


Question:
If the standing wave ratio for a transmission line is 1.4, then the reflection coefficient for the line is:

1.0.16667

2.1.6667

3.0.01667

4.0.96


Question:
If the wave number of an EM wave is 301/m in air , then the propagation constant β on a micro strip line with effective di electric constant 2.8 is:

1.602

2.503.669

3.150

4.200


Question:
Impedance matching sensitive receiver components may improve the _____ of the system.

1.noise

2.SNR

3.amplification factor

4.thermal noise


Question:
Large values of inductance can be realized by:

1.loop of transmission line

2.spiral inductor

3.coils of wires

4.none of the mentioned


Question:
Micro strip can be fabricated using:

1.Photo lithographic process

2.Electrochemical process

3.Mechanical methods

4.None of the mentioned


Question:
Microstrip line can support a pure TEM wave.

1.True

2.False

3.Microstrip supports only TM mode

4.Microstrip supports only TE mode


Question:
One of the most important factors to be considered in the selection of a particular matching network is:

1.noise component

2.amplification factor

3.bandwidth

4.none of the mentioned


Question:
S parameters are expressed as a ratio of:

1.Voltage and current

2.Impedance at different ports

3.Indecent and the reflected voltage waves

4.None of the mentioned


Question:
Scattering matrix for a reciprocal network is:

1.Symmetric

2.Unitary

3.Skew symmetric

4.Identity matrix


Question:
Slotted line is a transmission line configuration that allows the sampling of:

1.electric field amplitude of a standing wave on a terminated line

2.magnetic field amplitude of a standing wave on a terminated line

3.voltage used for excitation

4.current that is generated by the source


Question:
Stripline can be compared to a:

1.Flattened rectangular waveguide

2.Flattened circular waveguide

3.Flattened co axial cable

4.None of the mentioned


Question:
The device used to get the measurement of S parameters of n- port micro wave network is:

1.CRO

2.Network analyzer

3.Circulator

4.Attenuator


Question:
The effective di electric constant of a micro strip line with relative permittivity being equal to 2.6, with a width of 5mm and thickness equal to 8mm is given by:

1.2.6

2.1.97

3.1

4.2.43


Question:
The effective di electric constant of a microstrip line is:

1.Equal to one

2.Equal to the permittivity of the material

3.Cannot be predicted

4.Lies between 1 and the relative permittivity of the micro strip line


Question:
The major limitation of a lumped elements matching ‘L’ network is:

1.they are not equally efficient at higher frequencies as they are at lower frequencies.

2.size of the network

3.they restrict flow of current

4.none of the mentioned


Question:
The matched network is placed between:

1.load and transmission line

2.source and the transmission line

3.source and the load

4.none of the mentioned


Question:
The mode of propagation in a microstrip line is:

1.Quasi TEM mode

2.TEM mode

3.TM mode

4.TE mode


Question:
The one below among others is not a type TEM line used in microwave networks:

1.Co-axial wire

2.Micro strip line

3.Strip lines

4.Surface guide


Question:
The one below is the only micro wave network element that is a TEM line:

1.Co-axial cable

2.Rectangular wave guide

3.Circular wave guide

4.Surface wave guide


Question:
The relation between incident voltage matrix , reflected voltage matrix and S matrix for a microwave network:

1.[v-] = [s] [v+].

2.[v+] = [s] [v-].

3.[v-] [v] = [s].

4.[s] = [v] [v-].


Question:
The relation between voltage, current and admittance matrices of a microwave network is:

1.[I] = [Y] [V]

2.[Y] = [V] [I]

3.[I] = [Z] [V]

4.[V] = [Z]-1[I]


Question:
The relation between voltage, current and impedance matrices of a microwave network is:

1.[V] = [Z][I]

2.[Z] = [V][I]

3.[I] = [Z][V]

4.[V] = [Z]-[I]


Question:
The simplest type of matching network, L section consists of _______ reactive elements.

1.One

2.two

3.four

4.six


Question:
The wave number in air for EM wave propagating on a micro strip line operating at 10GHz is given by:

1.200

2.211

3.312

4.209


Question:
The wave number of a stripline operating at a frequency of 10 GHz is:

1.401

2.155

3.206

4.310


Question:
When a transmission line is matched to a load using a matched network, reflected waves are present:

1.between the load and the matched network

2.between the matched network and the transmission line

3.between the source and the transmission line

4.between the matched network and source


Question:
Which mode of propagation is supported by a strip line?

1.TEM mode

2.TM mode

3.TE mode

4.None of the mentioned


Question:
Which of the following material is not used in the fabrication of resistors of thin films?

1.nichrome

2.tantalum nitride

3.doped semiconductor

4.pure silicon


Question:
With an increase in the operating frequency of a micro strip line, the effective di electric constant of a micro strip line:

1.Increases

2.Decreases

3.Independent of frequency

4.Depends on the material of the substrate used as the microstrip line


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