# Electrical engineering-Microwave Engineering MCQs Set/5 Sample Test,Sample questions

1.True

2.False

1.-0.0433

2.0.0433

3.0.01

4.-0.01

## Question: ```After impedance matching, if a graph is plot with frequency v/s reflection co-efficient of the transmission line is done, then at the frequency point for which the design is done, which of the following is true? ```

1.There is a peak at this point of the curve

2.There is a dip at this point of the curve

3.The curve is a straight line

4.Such a plot cannot be obtained

1.true

2.false

1.true

2.false

## Question: ```Complex load impedance can be converted to real load impedance by: ```

2.By introducing an approximate length of transmission line between load and quarter wave transformer

3.Changing the operating wavelength

4.None of the mentioned

1.True

2. False

1.True

2.False

1.true

2. false

1.1+j

2.0.3+j0.4

3.0.4+j0.3

4.0.3-j0.4

## Question: ```For co-axial lines and waveguides, ________ is more preferred. ```

1.Open circuited stub

2.Short circuited stub

3.Slotted section

4.Co-axial lines cannot be impedance matched

## Question: ```For series stub matching, the parameter used for matching is: ```

1.Impedance of the transmission line at a point

2.Voltage at a point on the transmission line

3.Admittance at a point on the transmission line

1.True

2.False

1.true

2.false

## Question: ```If a single section quarter wave transformer is used for impedance matching at some frequency, then the length of the matching line is: ```

1.Is different at different frequencies

2.Is a constant

3.Is Î»/2 for other frequencies

4.None of the mentioned

1.0.5714

2.0.987

3.0.786

4.1.75

## Question: ```If the characteristic impedance of a transmission line 50 Î© and reflection coefficient is 0.0126+j0.1996, then load impedance is: ```

3.0.26+j0.16

4.data insufficient

1.0.2

2.0.01

3.0.21

4.0.19

1.true

2.false

1.0.33334

2.1.33334

3.0

4.1

1.true

2.false

## Question: ```In a double stub tuner circuit, the load is of _______ length from the first stub. ```

1.fixed length

2.arbitrary length

3.depends on the load impedance to be matched

4.depends on the characteristic impedance of the transmission line

## Question: ```In shunt stub matching, the key parameter used for matching is: ```

1.Admittance of the line at a point

3.Impedance of the stub

## Question: ```In the multiple reflections analysis method, the total reflection is: ```

1.An infinite sum of partial reflections

2.An infinite sum of partial reflection and transmissions

3.Constant value

4.Finite sum of partial reflections

## Question: ```In the plot of normalized frequency v/s reflection co-efficient for a binomial multisection filter, the curve has a dip at: ```

1.center frequency

2.upper cutoff frequency

3.lower cutoff frequency

4.none of the mentioned

## Question: ```Major advantage of a quarter wave transformer is: ```

1.It gives proper matching

2.It gives high gain

4.None of the mentioned

1.True

2.False

## Question: ```Shunt stubs are preferred for: ```

1.Strip and microstrip lines

2.Coplanar waveguides

3.Circular waveguide

4.Circulators

1.true

2.false

## Question: ```The condition â”‚Ð“ (Î¸) â”‚=0 for Î¸=Ï€/2 of a binomial multi section transformer corresponds to the: ```

1.upper cutoff frequency

2.lower cutoff frequency

3.center frequency

4.none of the mentioned

## Question: ```The major advantage of double stub tuning is: ```

1.it uses 2 tuning stubs in fixed positions

2.it involves 2 stubs

3.length of the stub is variable

4.none of the mentioned

## Question: ```The major advantage of single stub tuning over other impedance matching techniques is: ```

1.Lumped elements are avoided

2.It can be fabricated as a part of transmission line media

4.All of the mentioned

1.true

2.false

## Question: ```The major disadvantage of single stub tuning is: ```

1.it requires a variable length of line between the load and the stub

2.it involves 2 variable parameters

3.complex calculation

4.none of the mentioned

1.True

2.False

1.True

2.False

## Question: ```The passband response of a binomial matching transformer can be called optimum: ```

1.if the roll off in the response curve is high

2.if the response is flat in the impedance matched region

3.if the matching network is frequency sensitive

4.none of the mentioned

## Question: ```The passband response of a binomial matching transformer can be called optimum: ```

1.if the roll off in the response curve is high

2.if the response is flat in the impedance matched region

3.if the matching network is frequency sensitive

4.none of the mentioned

## Question: ```The reactances associated with the transmission line due to discontinuities: ```

1.Can be ignored

2.Have to matched

3.Discontinuities do not exist

4.None of the mentioned

1.true

2.false

## Question: ```The simplest method of reducing the forbidden range of impedances is: ```

1.increase the distances between the stubs

2.reduce the distance between the stubs

3.increase the length of the stubs

4.reduce the length of the stubs

## Question: ```The standard stub spacing usually used is: ```

1.0, Î»/2

2.Î»/4, Î»/8

3.Î»/8, 3Î»/8

4.none of the mentioned

1.True

2.False

## Question: ```The two adjustable parameters in single stub matching are distanceâ€˜dâ€™ from the load to the stub position, and _________ ```

1.Susceptance or reactance provided by the stub

2.Length of the stub

3.Distance of the stub from the generator

4.None of the mentioned

1.True

2.False

## Question: ```To obtain a flat curve in the response of a binomial multisection transformer, N-1 derivatives of â”‚Ð“ (Î¸) â”‚are set to zero. This implies: ```

1.the frequency sensitivity of the matching section is increased linearly

2.the frequency sensitivity of the matching section is increased exponentially

3.roll off in the curve is increased

4.none of the mentioned

1.True

2.False

## More MCQS

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