A microstrip patch antenna has a width of 5.08mm and surface resistivity of 1.84*10-2. Then the attenuation due to conductor loss is:

1.0.0724

2.0.034

3.0.054

4.None of the mentioned

A rectangular cavity supports:

1.TEM mode of resonance

2.TM mode of resonance

3.TE mode of resonance

4.TE, TM modes of resonance

Attenuation constant Î± signifies:

1. real part of propagation constant

2.loss that the transmission line causes

3.none of the mentioned

4.All of the mentioned

Characteristic impedance of a transmission line is:

1.impedance Z of a transmission line

2.impedance which is a constant at any point on the transmission line

3. reciprocal of admittance of a transmission line

4.none of the mentioned

Characteristic impedance Zâ‚’ is given by:

1.âˆšZ/Y

2.âˆšZY

3.âˆšZ+âˆšY

4.âˆšZ-âˆšY

Even mode characteristic impedance of a Lange coupler:

1. (Vp.Cep)-1

2.Vp.Cep

3.(Vp.Lep)-1

4.Vp.Lep

Find the wave number of a rectangular cavity resonator filled with a dielectric of 2.25 and designed to operate at a frequency of 5 GHz.

1.157.08

2.145.2

3.345.1

4.415.08

For a 4 wire Lange coupler, if the odd mode and even mode capacitances are 12pF and 9pF respectively, then the equivalent capacitance in terms of two wired coupled line in even mode is:

1. 15.1 pF

2.16.7 pF

3.12 pF

4.9 pF

For an equal-split Wilkinson power divider of 50Î© system impedance, the characteristic impedance of quarter wave transmission line used is:

1.70.7 Î©

2.50 Î©

3.100 Î©

4.None of the mentioned

For even mode excitation of a Lange coupler, all the four lines of the Lange coupler are at:

1. equal potential

2.zero potential

3.unequal potential

4.negative potential

If a device is passive and contains no anisotropic elements, then the device is_______ network.

1.Reciprocal

2.Non reciprocal

3.Lossless

4.Lossy

If the attenuation due to dielectric loss and attenuation due to conductor loss in a microstrip transmission line is 0.024Np/m and 0.0724 Np/m, then the unloaded quality factor if the propagation constant is 151 is:

1.1502

2.783

3.587

4.234

If the coupling coefficient of a coupled line coupler is 0.1 and the characteristic impedance of the material is 50 Î©, then the odd mode characteristic impedance is:

1.45.23 Î©

2.50 Î©

3.38 Î©

4.None of the mentioned

If the input power is divided in the ratio of 2:1 in a T- junction coupler and the characteristic impedance of the 2 output lines is 150Î© and 75Î©, then the impedance of the input line is:

1.100Î©

2. 50Î©

3.150Î©

4.None of the mentioned

If unloaded Q due to conductor loss and unloaded Q due to dielectric loss is 29390 and 2500 respectively, then the total unloaded Q of the circular cavity is:

1.2500

2.29390

3.2300

4.31890

Isolation of a directional coupler is a measure of the:

1. Power delivered to the uncoupled port

2.Power delivered to the coupled port

3.Power delivered to the second port

4.None of the mentioned

Propagation constant Î³ in terms of admittance and impedance of the transmission line is:

1.âˆšZ/Y

2.âˆšZY

3.ZY

4.ZY*

Propagation constant Î³ is a :

1. real value

2.none of the mentioned

3. imaginary value

4.complex value

Riblet-short slot coupler allows only:

1.TE10 mode of propagation

2.TE20 mode of propagation

3.Both a and b

4.None of the mentioned

The loss tangent for a circular cavity resonator is 0.0004.Then the unloaded Q due to dielectric loss is:

1.1350

2.1560

3.560

4.2500

The mode of propagation of propagation supported by coupled line couplers is:

1.TM mode

2.TE mode

3.TEM mode

4.quasi TEM mode

The output power measured at the 2 ports of the T junction:

1.Is a constant

2.Variable

3.Is not real power

4.None of the mentioned

. If a dielectric resonator has a dielectric constant of 49, then the reflection coefficient of the dielectric resonator is:

1.0.5

2.0.75

3.0.1

4.0.7

18000 ring hybrid with system impedance of 50 Î© has to be designed. Then the characteristic impedance of the arms of the 1800 hybrid is:

1.50 Î©

2.70.70 Î©

3.100 Î©

4.None of the mentioned

A 50 Î© branch-line Quadrature hybrid has to be designed to operate over a range of frequencies. The branch-line impedance of this coupler so designed is:

1.70.7 Î©

2.35.4 Î©

3.50 Î©

4.100 Î©

A circular cavity resonator has a wave number of 151, radius of 2.74 cm, and surface resistance of 0.0184Î©. If the cavity is filled with a dielectric of 2.01, then unloaded Q due to conductor loss is:

1.25490

2.21460

3.29390

4.none of the mentioned

A circular cavity resonator is filled with a dielectric of 2.08 and is operating at 5GHz of frequency. Then the wave number is:

1.181

2.151

3.161

4.216

A coaxial cable is air filled with air as dielectric with inner and outer radius equal to 1 mm and 4 mm. If the surface resistivity is 1.84*10-2Î©,then the attenuation due to conductor loss is:

1.0.011

2.0.022

3.0.11

4.0.22

A cylindrical cavity resonator can be constructed using a circular waveguide.

1.shorted at both the ends

2.open at both the ends

3.matched at both the ends

4.none of the mentioned

A major disadvantage of Lange coupler is:

1.high power loss

2.complex construction

3.low gain

4.None of the mentioned

A major disadvantage of the lossless T-junction power divider is:

1. Not matched at all the ports

2.Low power output

3.Complex construction

4.None of the mentioned

Coupled line couplers are:

1.symmetric couplers

2.asymmetric couplers

3.in phase couplers

4.type of hybrid coupler

Example of a non reciprocal device:

1.Branch line coupler

2. Wilkinson coupler

3.Magic-T hybrid

4.Circulator

For a 4 wire Lange coupler, if the odd mode and even mode capacitances are 12pF and 9pF respectively, then the equivalent capacitance in terms of two wired coupled line in odd mode is:

1.18.56 pF

2.25.71 pF

3.42 pF

4. 31.6 pF

For coupled line coupler, if the voltage coupling factor is 0.1 and the characteristic impedance of the microstrip line is 50 Î©, even mode characteristic impedance is:

1.50.23 Î©

2.55.28 Î©

3.100 Î©

4.80.8 Î©

Given that the wave number of a circular cavity resonator is 151 (TE011 mode), and the length of the cavity is twice the radius of the cavity, the radius of the circular cavity operating at 5GHz frequency is:

1.2.1 cm

2.1.7 cm

3.2.84 cm

4.insufficient data

If 10 watt is applied to the input port of a standard Wilkinson divider, then the sum of the power measured at the two output ports of the Wilkinson coupler is

1.5 watt

2.10 watt

3.7.07 watt

4.8 watt

If a microwave network is lossless, then S matrix of the microwave network is:

1.Unitary

2.Symmetric

3.Identity matrix

4.Zero matrix

If the loss tangent of a rectangular waveguide is 0.0004, then Q due to dielectric loss is:

1.1250

2.2450

3.2500

4.1800

In order to obtain the resonant frequency of a rectangular waveguide, the closed cavity has to satisfy:

1.Gaussian equation

2.Helmholtz equation

3.Ampereâ€™s law

4.None of the mentioned

Power dividers and couplers are ______ microwave components used for power division or power combining.

1.Passive

2.Active

3.Linear

4.Non linear

Propagation constant Î³ is given by:

1.Î±+jÎ²

2.Î±-jÎ²

3.Î±/jÎ²

4.Î±.jÎ²

Quadrature hybrids are those couplers which are:

1.3 dB couplers

2.Directional couplers

3.They have a 900 phase difference between signals in through and coupled arms.

4.All of the mentioned

Scattering matrix of a reciprocal network is:

1.Symmetric

2.Asymmetric

3.Identity matrix

4.Null matrix

Schwinger reversed phase coupler is a waveguide coupler designed so that the path lengths for the two coupling apertures are the same for_________

1.Coupled port

2.Uncoupled port

3.Back port

4.Isolated port

Short circuited Î»/2 transmission line has a quality factor of:

1.Î²/2Î±

2.2Î²/Î±

3.Î²/Î±

4.Z0/ZL

T- junction is an example for:

1.2 port network

2.3 port network

3.4 port network

4.None of the mentioned

The analysis of Wilkinson coupler is done using:

1.Even-odd mode analysis

2.Symmetry

3.S matrix approach

4.None of the mentioned

The capacitance per unit length of broadside parallel lines with width W and separation d is:

1.âˆˆW/d

2.âˆˆd/W

3.dW/âˆˆ

4. none of the mentioned

The in phase combining of power at the coupled port is achieved by means of a _______

1.Matching network

2.A small slot

3.Quarter Wave transformer

4.None of the mentioned

The in phase combining of power at the coupled port is achieved by means of a _______

1.Matching network

2.A small slot

3.Quarter Wave transformer

4.None of the mentioned

The key difference between circuit theory and transmission line theory is:

1.circuit elements

2.voltage

3.current

4.electrical size

The major disadvantage of coupled line coupler is:

1.complex construction

2.low power gain

3.higher loss

4.none of the mentioned

The major disadvantage of dielectric resonators is:

1.complex construction

2.field fringing

3.requirement of high dielectric constant

4.None of the mentioned

The mode of the circular cavity resonator used in frequency meters is:

1.TE011 mode

2.TE101 mode

3.TE111 mode

4.TM111 mode

The propagation constant of TEmn mode of propagation for a cylindrical cavity resonator is:

1.âˆš (k2-(pnm/a)2)

2.âˆš pnm/a

3.âˆš (k2+(pnm/a)2)

4.None of the mentioned

The required length of the cavity resonator for l=1 mode (m=1, n=0) given that the wave number of the cavity resonator is 157.01 and the broader dimension of the waveguide is 4.755 cm:

1.1.10 cm

2.2.20 cm

3.2.8 cm

4.1.8 cm

The S matrix of a Quadrature hybrid is of size 4Ã—4 and the diagonal elements of a matched coupler are all:

1.1

2.0

3.Cannot be determined

4. None of the mentioned

The Wilkinson power divider is a:

1.2 port network

2.3 port network

3.4 port network

4.None of the mentioned

To model a transmission line of infinitesimal length Î”z, the lumped element that is not used is:

1.resistor

2.inductor

3.capacitor

4.transistor

Transmission line is a _________ parameter network.

1.lumped

2.distributed

3.active

4.None of the mentioned

Unloaded Q of a rectangular waveguide cavity resonator:

1. Does not exist

2.Defined as the ratio of length of the waveguide to breadth of the waveguide c)

3.Defined as the ratio of stored energy to the power dissipated in the walls

4.None of the mentioned

________ and __________ contribute to the admittance of a transmission line in the lumped element representation.

1.conductance G, capacitor

2.conductance, inductor

3.resistor, capacitor

4.resistor, inductor

_________ and __________ contribute to the impedance of a transmission line in the lumped element representation.

1.resistor, inductor

2.resistor, capacitor

3.capacitor, inductor

4.transistor, capacitor

_________ is a key component in the scalar or vector network analyzer.

1.Reflectometer

2.Radiometer

3. Frequency meter

4.None of the mentioned

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