# Electrical engineering-Microwave Engineering MCQs Set/2 Sample Test,Sample questions

1.1ÂµF

2.10 ÂµF

3.0.1 ÂµF

4.50 ÂµF

1.4

2.2

3.3

4.6

## Question: ```A hollow rectangular waveguide cannot propagate TEM waves because: ```

1.Of the existence of only one conductor

2.Of the losses caused

3. It is dependent on the type of the material used

4.None of the mentioned

## Question: ```A lossy line that has a linear phase factor as a function of frequency is called: ```

1.distortion less line

2. terminated lossy line

3.loss less line

4.lossy line

1.100+100j

2.1+j

3.100-100j

4.1-j

## Question: ```Dominant mode is defined as: ```

1.Mode with the lowest cut off frequency

2.Mode with the highest cut off frequency

3.Any TEM mode is called a dominant mode

4.None of the mentioned

1.âˆš(C/L)

2.âˆš(CL)

3.âˆš(L/C)

4.1/âˆš(LC)

## Question: ```Expression for Î±(attenuation constant) in terms of R , G, L and C of a transmission line is: ```

1.(Râˆš(C/L)+Gâˆš(L/C))0.5

2.(Râˆš(C/L)+Gâˆš(L/C))

3.(Râˆš(L/C)+Gâˆš(C/L))

4.(Râˆš(L/C)+Gâˆš(C/L))0.5

1.10 pF

2.1pF

3.1nF

4.10nF

## Question: ```For a lossy transmission line, Î³=0.02+j0.15 and is 20m long. The line is terminated with an impedance of a 400Î©. Then the input impedance of the transmission line given that the characteristic impedance of the transmission line is 156.13+j11.38Î© is: ```

4.none of the mentioned

## Question: ```For a low loss line when both conductor and di-electric loss is small, the assumption that could be made is: ```

1.R < < Ï‰L and G < < Ï‰C

2.R > > Ï‰L and G > >Ï‰C

3.R < <Ï‰C and G < < Ï‰L

4.R > >Ï‰C and G > >Ï‰L

## Question: ```For a matched transmission line with a generator impedance of 50Î© and the source being 4V,1GHZ,then the maximum power delivered to the line is: ```

1.0.4 watt

2. 0.04 watt

3.0.5 watt

4.no power is delivered

## Question: ```For a parallel plate waveguide, which of the following is true? ```

1.No real power flow occurs in the â€˜zâ€™ direction

2.Power flow occurs in â€˜zâ€™ direction

3.No power flow occurs in any direction

4.Wave propagation in z direction is not possible in any mode

## Question: ```For a parallel waveguide, the dominant mode for TM propagation is: ```

1.TM0 mode

2.TM1 mode

3. TM2 mode

4.Dominant mode does not exist

## Question: ```For any mode of propagation in a rectangular waveguide, propagation occurs: ```

1.Above the cut off frequency

2.Below the cut off frequency

3. Only at the cut-off frequency

4.Depends on the dimension of the waveguide

1.100

2.500

3.50

4.1000

1.20 mm

2.80 mm

3.40 mm

4.60 mm

1.0.1 watt

2.0.9 watt

3. 0.8 watt

4.1watt

1.0.0.158

2.0.0523

3.0.0216

4.0.0745

1.0.0334

2.0.05

3.0.08

4.0.09

## Question: ```If the generator impedance of a source connected to a transmission line is 50+j100Î©, then for conjugate matching to occur, the input impedance must be: ```

4.one of the mentioned

## Question: ```If the inductance and capacitance of a loss line transmission line are 45 mH/m and10 ÂµF/m, the characteristic impedance of the transmission line is: ```

4. none of the mentioned

1.1.326

2.2.34

3.4.5

4.6.7

1.1.885

2.2

3.2.2

4.2.5

## Question: ```If the wavelength of a signal is 10 mm, then the wavenumber of the material when a waveguide is filled with that material is: ```

1.628

2. 345

3. 123

4.None of the mentioned

## Question: ```If the width of a parallel plate waveguide is 30 mm and the distance between the parallel pates is 5 mm, with an intrinsic impedance of 377Î©, then the characteristic impedance of the wave is: ```

4.None of the mentioned

## Question: ```In a parallel plate waveguide, for a propagating mode, the value of Î² is: ```

1.Real

2.Complex

3.Imaginary

4.Cannot be defined

1.4 cm

2.8 cm

3.1 cm

4.2 cm

1.8 cm

2.6 cm

3.4 cm

4.2 cm

1.TM01 mode

2.TM11 mode

3.TM12 mode

4.TM10 mode

## Question: ```Maxwellâ€™s equation for electromagnetic waves in a waveguide is: ```

1.âˆ‡Ã—E = -jÏ‰Âµ(vector H)

2.âˆ‡Ã—E =-jÏ‰Î¼(vector E)

3.âˆ‡Ã—H=-jÏ‰Î¼(vector H)

4.âˆ‡Ã—H=jÏ‰Î¼(vector H)

## Question: ```Phase velocity of the plane waves in the two direction in a parallel plate waveguide is: ```

1.1/âˆš(Î¼âˆˆ)secant Î¸

2.1/âˆš(Î¼âˆˆ)cosecant Î¸

3.1/âˆš(Î¼âˆˆ)tangent Î¸

4.1/âˆš(Î¼âˆˆ)cosine Î¸

## Question: ```The characteristic impedance of a parallel plate waveguide is given by: ```

1.Î·*D/W

2.Î·*W/D

3.D/ Î·*W d) Î·*âˆš(D/W)

1.R/L=G/C

2.R/C=G/L

3.R=G

4.C=L

## Question: ```The cutoff frequencies of the first two propagating modes of a Teflon on a filled circular waveguide with a=0.5 with âˆˆr=2.08 is: ```

1.12.19 GHz, 15.92 GHz

2.10 GHz, 12 GHz

3.12 GHz, 15 GHz

4.15 GHz, 12 GHz

1.2 GHz

2.1 GHz

3.2 MHz

4.4 MHz

## Question: ```The fringe effect can be neglected in a parallel plate waveguide is because of: ```

1.The dielectric material used

2.Width of the plates is greater than the distance between the plates

3.Material of the parallel plate waveguide used

4.None of the mentioned

## Question: ```The losses that occur in a transmission line is: ```

1.Conduction losses

2.Di-electric loss

3.Both of the mentioned

4.None of the mentioned

1.TE10 mode

2.TE00 mode

3. TE01 mode

4. TE11 mode

1.TM10 mode

2.TM01 mode

3.TM11 mode

4.TM12 mode

## Question: ```The modes of propagation supported by a rectangular wave guide is: ```

1.TM, TEM, TE modes

2.TM, TE

3. TM, TEM

4.TE, TEM

## Question: ```The modes of wave propagation that a parallel plate waveguide can support are: ```

1.TEM, TE, TM modes

2.TM, TE modes

3. TEM, TM modes

4.TEM, TE modes

1.K/Î²

2.Imaginary

3.Zero

4.Non-existing

## Question: ```The wave impedance of a TM mode in a parallel plate waveguide is a: ```

1.Function of frequency

2.Independent of frequency

3. Proportional to square of frequency

4.Inversely proportional to square of frequency

## Question: ```What are the modes of propagation that a co axial line supports? ```

1.TM, TE mode

2.TM, TE, TEM mode

3.TM, TEM mode

4.TE, TEM mode

## Question: ```Which of the following is true regarding attenuation? ```

1.Conductor loss

2.Di-electric loss

3.Sum of both conductor loss and di electric loss

4.Attenuation is different from the losses

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