Engineering/Microwave Engineering Mcq Set 1 Sample Test,Sample questions

Question:
 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

Posted Date:-2022-02-17 01:23:34


Question:
 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

Posted Date:-2022-02-17 01:27:09


Question:
 Attenuation constant α signifies:

1. real part of propagation constant

2.loss that the transmission line causes

3.none of the mentioned

4.All of the mentioned

Posted Date:-2022-02-17 01:15:15


Question:
 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

Posted Date:-2022-02-17 01:13:42


Question:
 Characteristic impedance Zₒ is given by:

1.√Z/Y

2.√ZY

3.√Z+√Y

4.√Z-√Y

Posted Date:-2022-02-17 01:16:55


Question:
 Even mode characteristic impedance of a Lange coupler:

1. (Vp.Cep)-1

2.Vp.Cep

3.(Vp.Lep)-1

4.Vp.Lep

Posted Date:-2022-02-17 03:18:08


Question:
 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

Posted Date:-2022-02-17 01:32:24


Question:
 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

Posted Date:-2022-02-17 03:19:06


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

1.70.7 Ω

2.50 Ω

3.100 Ω

4.None of the mentioned

Posted Date:-2022-02-17 03:00:25


Question:
 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

Posted Date:-2022-02-17 03:16:25


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

1.Reciprocal

2.Non reciprocal

3.Lossless

4.Lossy

Posted Date:-2022-02-17 02:15:50


Question:
 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

Posted Date:-2022-02-17 01:26:04


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

1.45.23 Ω

2.50 Ω

3.38 Ω

4.None of the mentioned

Posted Date:-2022-02-17 03:09:17


Question:
 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 150Ω and 75Ω, then the impedance of the input line is:

1.100Ω

2. 50Ω

3.150Ω

4.None of the mentioned

Posted Date:-2022-02-17 02:32:02


Question:
 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

Posted Date:-2022-02-17 01:44:47


Question:
 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

Posted Date:-2022-02-17 02:18:10


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

1.√Z/Y

2.√ZY

3.ZY

4.ZY*

Posted Date:-2022-02-17 01:19:31


Question:
 Propagation constant γ is a :

1. real value

2.none of the mentioned

3. imaginary value

4.complex value

Posted Date:-2022-02-17 01:14:22


Question:
 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

Posted Date:-2022-02-17 03:26:21


Question:
 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

Posted Date:-2022-02-17 01:40:00


Question:
 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

Posted Date:-2022-02-17 03:06:22


Question:
 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

Posted Date:-2022-02-17 02:30:27


Question:
. 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

Posted Date:-2022-02-17 01:51:51


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

1.50 Ω

2.70.70 Ω

3.100 Ω

4.None of the mentioned

Posted Date:-2022-02-17 03:21:36


Question:
A 50 Ω 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 Ω

2.35.4 Ω

3.50 Ω

4.100 Ω

Posted Date:-2022-02-17 03:04:16


Question:
A circular cavity resonator has a wave number of 151, radius of 2.74 cm, and surface resistance of 0.0184Ω. 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

Posted Date:-2022-02-17 01:42:47


Question:
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

Posted Date:-2022-02-17 01:38:15


Question:
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*10-2Ω,then the attenuation due to conductor loss is:

1.0.011

2.0.022

3.0.11

4.0.22

Posted Date:-2022-02-17 01:22:49


Question:
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

Posted Date:-2022-02-17 01:35:33


Question:
A major disadvantage of Lange coupler is:

1.high power loss

2.complex construction

3.low gain

4.None of the mentioned

Posted Date:-2022-02-17 03:14:03


Question:
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

Posted Date:-2022-02-17 02:57:12


Question:
Coupled line couplers are:

1.symmetric couplers

2.asymmetric couplers

3.in phase couplers

4.type of hybrid coupler

Posted Date:-2022-02-17 03:07:10


Question:
Example of a non reciprocal device:

1.Branch line coupler

2. Wilkinson coupler

3.Magic-T hybrid

4.Circulator

Posted Date:-2022-02-17 03:27:57


Question:
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

Posted Date:-2022-02-17 03:20:11


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

1.50.23 Ω

2.55.28 Ω

3.100 Ω

4.80.8 Ω

Posted Date:-2022-02-17 03:08:09


Question:
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

Posted Date:-2022-02-17 01:38:59


Question:
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

Posted Date:-2022-02-17 02:58:48


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

1.Unitary

2.Symmetric

3.Identity matrix

4.Zero matrix

Posted Date:-2022-02-17 02:17:26


Question:
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

Posted Date:-2022-02-17 01:34:11


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

1.Gaussian equation

2.Helmholtz equation

3.Ampere’s law

4.None of the mentioned

Posted Date:-2022-02-17 01:27:54


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

1.Passive

2.Active

3.Linear

4.Non linear

Posted Date:-2022-02-17 02:14:17


Question:
Propagation constant γ is given by:

1.α+jβ

2.α-jβ

3.α/jβ

4.α.jβ

Posted Date:-2022-02-17 01:16:04


Question:
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

Posted Date:-2022-02-17 03:01:52


Question:
Scattering matrix of a reciprocal network is:

1.Symmetric

2.Asymmetric

3.Identity matrix

4.Null matrix

Posted Date:-2022-02-17 02:16:35


Question:
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

Posted Date:-2022-02-17 03:22:37


Question:
Short circuited λ/2 transmission line has a quality factor of:

1.β/2α

2.2β/α

3.β/α

4.Z0/ZL

Posted Date:-2022-02-17 01:21:48


Question:
T- junction is an example for:

1.2 port network

2.3 port network

3.4 port network

4.None of the mentioned

Posted Date:-2022-02-17 02:15:15


Question:
The analysis of Wilkinson coupler is done using:

1.Even-odd mode analysis

2.Symmetry

3.S matrix approach

4.None of the mentioned

Posted Date:-2022-02-17 02:59:30


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

1.∈W/d

2.∈d/W

3.dW/∈

4. none of the mentioned

Posted Date:-2022-02-17 03:10:51


Question:
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

Posted Date:-2022-02-17 03:23:28


Question:
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

Posted Date:-2022-02-17 03:25:23


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

1.circuit elements

2.voltage

3.current

4.electrical size

Posted Date:-2022-02-17 01:01:00


Question:
The major disadvantage of coupled line coupler is:

1.complex construction

2.low power gain

3.higher loss

4.none of the mentioned

Posted Date:-2022-02-17 03:12:50


Question:
The major disadvantage of dielectric resonators is:

1.complex construction

2.field fringing

3.requirement of high dielectric constant

4.None of the mentioned

Posted Date:-2022-02-17 01:51:05


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

1.TE011 mode

2.TE101 mode

3.TE111 mode

4.TM111 mode

Posted Date:-2022-02-17 01:36:23


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

1.√ (k2-(pnm/a)2)

2.√ pnm/a

3.√ (k2+(pnm/a)2)

4.None of the mentioned

Posted Date:-2022-02-17 01:37:22


Question:
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

Posted Date:-2022-02-17 01:33:17


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

1.1

2.0

3.Cannot be determined

4. None of the mentioned

Posted Date:-2022-02-17 03:02:52


Question:
The Wilkinson power divider is a:

1.2 port network

2.3 port network

3.4 port network

4.None of the mentioned

Posted Date:-2022-02-17 02:58:06


Question:
To model a transmission line of infinitesimal length Δz, the lumped element that is not used is:

1.resistor

2.inductor

3.capacitor

4.transistor

Posted Date:-2022-02-17 01:10:28


Question:
Transmission line is a _________ parameter network.

1.lumped

2.distributed

3.active

4.None of the mentioned

Posted Date:-2022-02-17 01:09:17


Question:
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

Posted Date:-2022-02-17 01:29:33


Question:
________ 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

Posted Date:-2022-02-17 01:12:59


Question:
_________ 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

Posted Date:-2022-02-17 01:12:16


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

1.Reflectometer

2.Radiometer

3. Frequency meter

4.None of the mentioned

Posted Date:-2022-02-17 03:27:04


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