# 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

## 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

## 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

## 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

1.√Z/Y

2.√ZY

3.√Z+√Y

4.√Z-√Y

1. (Vp.Cep)-1

2.Vp.Cep

3.(Vp.Lep)-1

4.Vp.Lep

1.157.08

2.145.2

3.345.1

4.415.08

1. 15.1 pF

2.16.7 pF

3.12 pF

4.9 pF

## 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

## 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

1.Reciprocal

2.Non reciprocal

3.Lossless

4.Lossy

1.1502

2.783

3.587

4.234

## 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

## 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

1.2500

2.29390

3.2300

4.31890

## 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

1.√Z/Y

2.√ZY

3.ZY

4.ZY*

## Question: ``` Propagation constant γ is a : ```

1. real value

2.none of the mentioned

3. imaginary value

4.complex value

## 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

1.1350

2.1560

3.560

4.2500

1.TM mode

2.TE mode

3.TEM mode

4.quasi TEM mode

## 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

1.0.5

2.0.75

3.0.1

4.0.7

## 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

1.70.7 Ω

2.35.4 Ω

3.50 Ω

4.100 Ω

## 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

1.181

2.151

3.161

4.216

1.0.011

2.0.022

3.0.11

4.0.22

## 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

## Question: ```A major disadvantage of Lange coupler is: ```

1.high power loss

2.complex construction

3.low gain

4.None of the mentioned

## 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

## Question: ```Coupled line couplers are: ```

1.symmetric couplers

2.asymmetric couplers

3.in phase couplers

4.type of hybrid coupler

## Question: ```Example of a non reciprocal device: ```

1.Branch line coupler

2. Wilkinson coupler

3.Magic-T hybrid

4.Circulator

1.18.56 pF

2.25.71 pF

3.42 pF

4. 31.6 pF

1.50.23 Ω

2.55.28 Ω

3.100 Ω

4.80.8 Ω

## 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

1.5 watt

2.10 watt

3.7.07 watt

4.8 watt

## 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

1.1250

2.2450

3.2500

4.1800

## 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

1.Passive

2.Active

3.Linear

4.Non linear

1.α+jβ

2.α-jβ

3.α/jβ

4.α.jβ

## 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

## Question: ```Scattering matrix of a reciprocal network is: ```

1.Symmetric

2.Asymmetric

3.Identity matrix

4.Null matrix

1.Coupled port

2.Uncoupled port

3.Back port

4.Isolated port

1.β/2α

2.2β/α

3.β/α

4.Z0/ZL

## Question: ```T- junction is an example for: ```

1.2 port network

2.3 port network

3.4 port network

4.None of the mentioned

## 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

## 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

## 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

## 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

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

1.circuit elements

2.voltage

3.current

4.electrical size

## Question: ```The major disadvantage of coupled line coupler is: ```

1.complex construction

2.low power gain

3.higher loss

4.none of the mentioned

## 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

1.TE011 mode

2.TE101 mode

3.TE111 mode

4.TM111 mode

## 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

1.1.10 cm

2.2.20 cm

3.2.8 cm

4.1.8 cm

## 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

## Question: ```The Wilkinson power divider is a: ```

1.2 port network

2.3 port network

3.4 port network

4.None of the mentioned

1.resistor

2.inductor

3.capacitor

4.transistor

## Question: ```Transmission line is a _________ parameter network. ```

1.lumped

2.distributed

3.active

4.None of the mentioned

## 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

## 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

## 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

1.Reflectometer