Loaded Q and External Q are 2 different parameters.

1.True

2.False

Quality factor-Q of a resonant circuit signifies:

1.Loss in the resonant circuit

2.Gain in the resonant circuit

3.Magnetic energy stored in the circuit

4.Electric energy stored in the circuit

1800 hybrid is a network in which there is a phase shift of 1800 between the input signal applied and the output taken.

1.true

2.false

A basic Reflectometer circuit can be used to measure the _____________ magnitude of the unknown load.

1.Reflection coefficient

2.Standing wave ratio

3.Transmission coefficient

4.None of the mentioned

A branch-line coupler is an asymmetric coupler.

1.True

2.False

A circulator is a 3 port network that allows energy flow in clockwise direction only.

1.True

2. False

A dielectric material in the form of a small cube or disc can be used as a resonator.

1.true

2.false

A dielectric resonator is considered to be closed at both the ends.

1.true

2.false

A lossless reciprocal 3 port network can be matched at all the three ports.

1.True

2.False

A lossy T junction can be matched at all the three ports.

1.True

2.False

A major disadvantage of high electron mobility transistor is that:

1.They have low gain

2.High manufacturing cost

3.Temperature sensitive

4.High driving voltage is required

A measure of the level of coupling between a resonator and a feed is given by:

1.coupling coefficient

2.power transfer coefficient

3.voltage coefficient

4.reflection coefficient

A perfect match can be obtained in the passband for any impedance matching circuit around the center frequency for which it is defined.

1.True

2.False

A single section tapered line is more efficient in impedance matching than a multisection tapered line for impedance matching.

1.True

2.False

A T junction has a 3Ã—3 â€˜sâ€™ matrix.

1.True

2.False

A T junction power divider can be used only for division of power.

1.True

2.False

A Wilkinson coupler designed can be operated at any frequency.

1.True

2.False

Advantage of chebyshev matching transformers over binomial transformers is:

1.higher gain

2.low power losses

3.higher roll-off in the characteristic curve

4.higher bandwidth

An air coaxial cable has attenuation of 0.022 and phase constant of 104.7, then the quality factor of a Î»/2 short circuited resonator made out of this material is:

1.2380

2.1218

3.1416

4.Insufficient data

Branch-line couplers are also popular as Quadrature hybrids.

1.True

2.False

Chebyshev matching transformers can be universally used for impedance matching in any of the microwave networks.

1.true

2.false

Chebyshev polynomials do not obey the equal-ripple property.

1.true

2.false

Coupling coefficient Q can be defined as the ratio of unloaded Q to external Q.

1.true

2.false

Coupling factor of a directional coupler must be maximum and is a key factor that determines the performance of the coupler.

1.True

2.False

Dielectric resonators use materials that are less lossy.

1.true

2.false

Direct measurement of the unloaded Q of a resonator is not possible.

1.true

2.false

Directivity of a directional coupler signifies the direction of power flow in the coupler.

1.True

2.False

For a given load (a fixed RC product), a broader bandwidth can be achieved with a low reflection co-efficient in the passband.

1.True

2.False

For a parallel resonance circuit, the plot of input impedance magnitude v/s frequency has a dip at the resonant frequency.

1.True

2.False

For any load impedance, perfect match can be obtained and the minimum reflection co-efficient achieved can be zero.

1.True

2.False

For practical applications cavity resonators can be modified as per the requirement of the application where it is used.

1.true

2.false

For the realization of lossless T-junction power divider using transmission lines, the characteristic impedance of the transmission line has to be real.

1.True

2.False

For values of x greater than 1, the chebyshev polynomial in its trigonometric form cannot be determined.

1.true

2.false

HEMT fabricated using GaN and aluminum gallium nitride on a silicon substrate can be used in :

1.High power transmitters

2.High power receivers

3.RADAR

4.Smart antennas

High drain current at RF levels is achieved with the biasing and decoupling circuitry for a dual polarity supply.

1.True

2.False

High electron mobility transistors can be constructed with the use of single semiconductor material like GaAs that have high electron mobility.

1.True

2.False

High-power circuits generally use higher values of:

1.Gate to source current

2.Drain to source current

3.Drain current

4.Gate to source voltage

Higher the quality factor of a series LCR circuit, greater is the operating bandwidth of the resonant circuit.

1.True

2.False

Hybrid couplers are also a type of directional couplers.

1.True

2.False

If a parallel RLC circuit is excited with a source of 8v, 50 Hz and the circuit has an inductor of 1mH, capacitor of 1ÂµF and a resistor of 50Î©, then the power loss that occurs in the circuit is:

1.6.4mW

2. 3.2mW

3.12.8mV

4.None of the mentioned

If all the ports of a microwave network are matched, then the diagonal elements of the S matrix of the network is zero.

1.True

2.False

If the branch-line impedance of a coupler designed to operate at 1 GHz is 70.70 Î©, then the characteristic impedance of the material of the arms of the branch-line coupler is:

1.70.7 Î©

2.50 Î©

3.100 Î©

4.None of the mentioned

In 1800 hybrid, different power levels can be received at the two output ports of the hybrid.

1.true

2.false

In a series LCR circuit, at resonance point the energy stored in the inductor and capacitor in the form of magnetic and electric energies are equal.

1.True

2.False

In a symmetric coupler, the power delivered to the through port and output port are equal.

1.True

2.False

In a waveguide magic-T there is no coupling of power between port 1 and port 4.

1.true

2.false

In aperture coupling, a small aperture in the transverse wall of the waveguide acts as:

1.shunt inductance

2.shunt capacitance

3.series inductance

4.series capacitance

In coupled line directional couplers, power from one line to another is transmitted through a microstrip line running between them.

1.true

2.false

Inductance of an open circuited Î»/2 transmission line is dependent on the characteristic impedance of the transmission line.

1.True

2.False

Insertion loss is the power delivered to the through port.

1.True

2.False

Lumped elements can be used to make resonators that rare to be operated at microwave frequencies.

1.True

2. False

Microwave resonators can be constructed from open sections of waveguide.

1.True

2.False

Moreno crossed-guide coupler is a waveguide directional coupler consists of four waveguides at right angle.

1.True

2.False

MOSFETs can provide a power of several hundred watts when the devices are packaged in:

1.Series

2.Parallel

3.Diagonal

4.None of the mentioned

One of the most commonly used dielectric materials is:

1.barium tetratetanate

2.titanium

3.teflon

4.none of the mentioned

Passband characteristics of tapered lines differ from one type of taper to another.

1.True

2.False

Port 1 and port 4 of 1800 hybrid are called sum and difference ports respectively because of their behavior and action mechanism.

1.true

2.false

Q factor does not exist for dielectric resonator.

1.true

2.false

Quality factor of a coaxial cable transmission line is independent of the medium between the wires of the transmission line.

1.True

2.False

Reflection co-efficient magnitude response is an exponential curve for tapered line.

1.True

2.False

Reflectometer can also be used as a frequency meter.

1.True

2.False

Ribblet short-slot coupler consists of two waveguides that are separated by a distance â€œdâ€.

1.True

2.False

S matrix of 1800 hybrid consists of all diagonal elements zero.

1.true

2.false

S12 and S13 curves for branch-line couplers are almost a straight line parallel to X â€“axis. Both the curves are similar and follow same path.

1.True

2.False

S12 curve of a Wilkinson coupler when plotted versus frequency is a line passing through origin.

1.True

2.False

Since multiple layers of semiconductor materials is used in high electron mobility transistors, this results in:

1.High gain

2.Power loss

3.Temperature sensitivity

4. Thermal stress

Symmetric tapered coupled line couplers offer higher bandwidth when compared to other forms of couplers.

1.True

2.False

The bandwidth of a series RLC circuit is 200 Hz. Then the quality factor of the circuit is:

1.200

2.100

3.0.005

4.0.5

The coupling and directivity of couplers with apertures in planar lines can be adjusted as per the requirement of the application.

1.True

2.False

The curve of IDS v/s VDS of an FET does not vary with the gate to source voltage applied.

1.True

2.False

The curve of S14 for a branch-line coupler is similar to that of the S11 curve of the branch-line coupler.

1.True

2.False

The diagonal elements of the s matrix of a resistive T junction are:

1.0

2.1

3.0.5

4.1.5

The diagonal elements of the S matrix of an improperly matched circulator is zero.

1.True

2.False

The direction of propagation is in z direction outside the dielectric in the resonator.

1.true

2.false

The equivalent capacitance of a short circuited Î»/4 transmission line is dependent on the characteristic impedance of the transmission line.

1.True

2.False

The equivalent resistance of a short circuited Î»/4 transmission line is independent of the characteristic impedance of the transmission line.

1.True

2.False

The level of coupling required between a resonator and its attached circuitry is a standard and independent of the application where coupling is required.

1.true

2.false

The lossless T junction dividers can be can all be modeled as a junction of three transmission lines.

1.True

2.False

The number of conductors used in the construction of coupled line couplers is fixed.

1.true

2.false

The plot of frequency v/s S11 parameter of a Wilkinson coupler has a dip at the frequency at which it is designed to operate.

1.True

2.False

The plot of input impedance magnitude v/s frequency has a peak at the resonant frequency.

1.True

2.False

The plot of S23 v/s frequency has the same curve as that of S11 v/s frequency.

1.True

2.False

The plot S11 v/s frequency for a branch-line coupler has a straight line characteristic for a wide range of frequency around the designed frequency range.

1.True

2. False

The power delivered to the input port of a resistive power divider is equal to the source voltage applied.

1.True

2.False

The power input at the port 1 of resistive T junction is equally divided among the 2 output ports of the T junction.

1.True

2.False

The relation between unloaded Q and external Q is:

1.External Q> unloaded Q

2.Unloaded Q> external Q

3.External Q = unloaded Q

4.None of the mentioned

The resonant frequency of a dielectric resonator cannot be mechanically tuned.

1.true

2.false

The scattering parameter S11 for GaN HELMT increases with increase in frequency of operation

1.True

2.False

The tapered coupled line 1800 hybrid can provide an arbitrary power division at the 2 output ports of the coupler.

1.true

2.false

The total energy stored in a series RLC circuit is equal to the energy stored in the inductor.

1.True

2.False

The value of constant â€˜aâ€™ for an exponentially tapered line of length 5 cm with load impedance being 100Î© and characteristic impedance of the line is 50Î© is:

1.0.1386

2.0.265

3.0.5

4.0.2

There are passband ripples present in the chebyshev characteristic curve.

1.true

2.false

There exists no difference between the construction of GaAs MESFET and silicon MOSFET except for the material used in their construction.

1.True

2.False

There is no energy stored inside a rectangular waveguide cavity resonator.

1.True

2.False

To obtain maximum power transfer between a resonator and feed line, the resonator should be matched to the load at:

1.resonant frequency

2.cutoff frequency

3. zero frequency

4.none of the mentioned

Triangular taper is the best solution for any impedance matching requirement.

1.True

2.False

When coupling coefficient is 1, the resonator is ________ to the feed line.

1.under coupled

2.over coupled

3.critically coupled

4.none of the mentioned

When the coupling coefficient is lesser than one, the resonator is over coupled to the feed line.

1.true

2.false

Wilkinson power divider is an equal split power divider.

1.True

2.False

________ is a three-port microwave device that can be lossless and matched at all spots.

1.Hybrid junction

2.Magic Tee

3.Circulator

4.Isolator

- Microwave Engineering MCQs Set-1
- Microwave Engineering MCQs Set-2
- Microwave Engineering MCQs Set-3
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- Network Theory Set-2
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- Network Theory Set-6
- Network Theory Set-7
- Network Theory MCQs Set-7
- Audio Video Engineering MCQs set -1
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