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

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

1.0-0.1ÂµF

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: Fields of TEM mode on strip line must satisfy:

1.Laplaceâ€™s equation

2.Ampereâ€™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

1.1.2 cm

2.2.52 cm

3.0.15 cm

4.3.2 cm

1.0.102

2.0.202

3.0.001

4.0.002

1.12.05 dB

2.0.15 dB

3.20 dB

4.10 dB

1.1.3333

2.2.3333

3.0.4

4.0.6

1.0.16667

2.1.6667

3.0.01667

4.0.96

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

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 â€˜Lâ€™ 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:

2.source and the transmission line

4.none of the mentioned

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-].

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

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

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

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

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

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

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

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

1.One

2.two

3.four

4.six

1.200

2.211

3.312

4.209

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

## More MCQS

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