# Electrical engineering-Microwave Engineering MCQs Set/1 Sample Test,Sample questions

## Question: ```A microwave generator at 1.2 GHz supplies power to a microwave transmission line having the parameters R=0.8Î©/m, G=O.8millisiemen/m, L=0.01ÂµH/m and C=0.4PF/m. Propagation constant of the transmission line is: ```

1.0.0654 +j0.48

2.0.064+j4.8

3.6.4+j4.8

4.none of the mentioned

## Question: ```Any passively realizable reflection coefficient can be plotted as a unique point on the smith chart. This statement implies that: ```

1.Reflection co-efficient less than or equal to 1 can be plotted

2.Reflection co-efficient greater than or equal to 1 can be plotted

3.Transmission co-efficient has to be less than or equal to one for the point to be located

4.T=Ð“+1

## Question: ```Expression for phase constant Î² is: ```

1.âˆšLC

2.Ï‰ âˆšLC

3.1/ (Ï‰ âˆšLC)

4.None of the mentioned

## Question: ```Flow of power in transmission line takes place through: ```

1.Electric field and magnetic field

2.Voltage and current

3.Voltage

4.Electric field

1.0.2 ÂµH

2.0.1 ÂµH

3.0.5 ÂµH

4.1 ÂµH

## Question: ```For a Î»/2 transmission line, if the characteristic impedance of the line is 50 Î© and the terminated with a load of 100 Î©, then its input impedance is: ```

4.none of the mentioned

1.Î³=jÎ²

2.Î³=Î±

3.Î³=Î±+jÎ²

4.Î³=Î±*jÎ²

## Question: ```For a parallel plate transmission line, if the complex part of permittivity is 2.5, if the width is 100 mm and the distance between the plates is 10 mm, then the conductance of the transmission line is: ```

1.25 Æ±

2.30 Æ±

3.45 Æ±

4.None of the mentioned

1.0.2 ÂµH

2. 0.1 ÂµH

3.0.3 ÂµH

4.0.4 ÂµH

1.0.5

2.1

3.0.2

4.0

1.0.4

2.1.4

3.0.8

4.2.8

1.-2.922dB

2.29dB

3.1.46dB

4.-29dB

1.4.2426

2.2.2

3.0.3

4.1

1.1+j

2.1-j

3.3+2j

4.2-3j

1.0.0305

2.0.3

3.30.3

4.0.6

## Question: ```If propagation constant is 12:60Â°, then the value of phase constant and attenuation constant is: ```

1.Î±=6, Î²=10.39

2.Î±=61, Î²=78

3.Î±=12, Î²=20.6

4.none of the mentioned

1.0

2.20

3.132

4.50

## Question: ```If the distance between the 2 wires in a 2 wire transmission line is 10 mm and the radii 2 mm, then the inductance of the transmission line is: ```

1.0.62 ÂµH

2. 1 ÂµH

3.2 ÂµH

4.None of the mentioned

## Question: ```If the input impedance of a Æ›/2 transmission line is 100 Î© with a voltage reflection coefficient of 0.344, then the characteristic impedance of the transmission line is: ```

4.None of the mentioned

1.0.3334

2.0.5

3.0.6667

4.1

1.15-j20

2.15+j20

3.1-j

4.0.3-0.4j

1.0.13 ÂµH

2.0.2 ÂµH

3.0.3 ÂµH

4.0.1 ÂµH

## Question: ```If the outer circumference and the inner circumference of a transmission line are 40Ï€ and 25Ï€ units respectively, then the capacitive reactance of the coaxial transmission line is: ```

1.0.376 nF

2.0.45 nF

3.0.9 nF

4.none of the mentioned

## Question: ```If the reflection co-efficient of a transmission line is 0.334 with a characteristic impedance of 50Î© then the input impedance of the transmission line is: ```

4.None of the mentioned

1.0.8

2.0.6

3.0.4

4.0.3

## Question: ```If there is no standing wave on a transmission line, then the value of SWR is: ```

1.1

2.0

3.Infinity

4.Insufficient data

1.0.035+j41.97

2.0.35+j4.97

3.35.6+j4.28

4.9.254+j4.6

1.20 pF

2.21.13 pF

3.23 pF

4.12 pF

1.0.1 ÂµH

2.0.526 ÂµH

3.0.9 ÂµH

4.1 ÂµH

## Question: ```Input impedance of a open circuited transmission line is represented using this trigonometric function: ```

1.sine function

2.cosine function

3.cotangent function

4. tangent function

## Question: ```Input impedance of a transmission line can be represented in terms of this simple trigonometry function. ```

1.sine function

2.cosine function

3.cotangent function

4.tangent function

## Question: ```Normalized impedance of 0.3+j0.4 lies in the: ```

1.Upper half of the impedance smith chart

2.Lower half of the impedance smith chart

3. Horizontal line of the chart

4.None of the mentioned

## Question: ```Normalized impedance of 1-j is: ```

1.In the upper half of the impedance smith chart

2.In the Lower half of the impedance smith chart

3.On the outer most circle of the smith chart.

4.On the horizontal line of the smith chart

## Question: ```Smith chart is based on the polar plot of: ```

1.Reactance

2.Voltage

3.Current

4.Voltage reflection co-efficient

## Question: ```The characteristic impedance of the transmission line if the outer diameter and inner diameter of the transmission line is 20 mm and 10 mm respectively, given the intrinsic impedance of the medium is 377 Î©, then the characteristic impedance of the transmission line is: ```

4.None of the mentioned

1.1 Np= 8.686 dB

2.1 dB=8.868 dB

3.Npâ‰¥dB

4.dBâ‰¥Np

## Question: ```The value of â€˜Î±â€™ for a lossless line is: ```

1.0

2.1

3.Infinity

4.Data insufficient

## Question: ```The value of reflection co efficient when a transmission line is matched to the load is: ```

1.1

2.0

3.0.707

4.cannot be determined

1.1

2.0

3.0.5

4.0.707

## Question: ```The wave impedance of air for a wave propagating in it is: ```

3.Insufficient data

4.None of the mentioned

## Question: ```To get an admittance chart from an impedance chart: ```

1.Smith chart has to be rotated by 90â°

2.Smith chart has to be rotated by 180â°

3.Admittance chart cannot be obtained from the impedance chart anyway.

4.None of the mentioned

## Question: ```Wave impedance of a wave travelling in a medium of a relative permittivity 2 and permeability 4 is ```

4.None of the mentioned

## Question: ```When a Î»/4 transmission line is used for impedance matching, then which of the following is valid? ```

1.Standing waves are present on the Î»/4 transmission line

2.No standing waves on the Î»/4 transmission line

3.Standing waves are not present both on the feed line and the matching Î»/4 line

4.Standing waves are present on both the feed line and the matching Î»/4 line

1.True

2. False

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