# Engineering/Microwave Engineering Mcq Set 2 Sample Test,Sample questions

## Question: ``` A PIN diode can be used in either a series or a shunt configuration to form a __________ ```

1.Single pole single throw switch

2.Single pole double throw switch

3.Amplifier

4.Oscillator

Posted Date:-2022-02-17 12:45:41

## Question: ``` Any semiconductor diode has a junction capacitance varying with reverse bias. If such a diode has microwave characteristics, it is called: ```

1. IMPATT diode

2.TRAPITT diode

3.SKOTTKY diode

4.None of the mentioned

Posted Date:-2022-02-17 12:56:04

## Question: ``` As the degree of non-linearity of a transistor or a diode increases, the power gain of the device: ```

1.Increases

2.Decreases

3.Remains a constant

4.None of the mentioned

Posted Date:-2022-02-17 12:02:34

## Question: ``` For a shunt configuration switch, the diode impedance is 40 Î© and the terminated line characteristic impedance is 50 Î©. Then the insertion loss of the switch is: ```

1.2.2 dB

2.4.2 dB

3.8.4 dB

4.3.6 dB

Posted Date:-2022-02-17 12:49:05

## Question: ``` GaAs is used in the fabrication of GUNN diodes because: ```

1.GaAs is cost effective

2.It less temperature sensitive

3.it has low conduction band electrons

4.less forbidden energy gap

Posted Date:-2022-02-17 13:07:17

## Question: ` Gain of a parametric amplifier in terms of the frequencies involved in their operation is:`

1.(fP â€“ fS)/fS

2. fS/ (fP â€“ fS)

3. fP/fS

4.None of the mentioned

Posted Date:-2022-02-17 13:05:13

## Question: ``` If the third order intercept point of a receiver is 35 dBm and the total noise in the receiver is -47.4 dBm signals to noise ratio is 10, then the spurious free dynamic range is: ```

1. 50.9 dB

2. 44.9 dB

3. 34.9 dB

4.67 dB

Posted Date:-2022-02-17 12:29:25

## Question: ` In a coherent cascade network, if the third order intercept point of an amplifier is 158 mW and the third order intercept point of a mixer is 5 mW, with an insertion loss of 6 dB, then the third order intercept point of the coherent cascade is:`

1.2 mW

2.4 mW

3. 4.4 mW

4.5 mW

Posted Date:-2022-02-17 12:07:31

## Question: ``` In a non coherent cascade network, if the third order intercept point of an amplifier is 158 mW and the third order intercept point of a mixer is 5 mW, with an insertion loss of 6 dB, then the third order intercept point of the coherent cascade is: ```

1. 3 mW

2.4.9 mW

3.5.2 mW

4. 2 mW

Posted Date:-2022-02-17 12:09:41

## Question: ``` In the plot of the magnitude of electric field around the periphery of the junction circulator, the curve has: ```

1.Three peaks

2.Two peaks

3.Four peaks

4.None of the mentioned

Posted Date:-2022-02-17 11:40:36

## Question: ` In the series configuration of a PIN diode switch, the terminated load impedance was found to be 50 Î© and the diode impedance was 60 `

1.4 dB

2.2 dB

3.3.6 dB

4.4.8 dB

Posted Date:-2022-02-17 12:51:53

## Question: ``` The expression for linear dynamic range is given by: ```

1.OP1 dB- No

2.OP1 dB/ No

3.OP1 dB+No

4.None of the mentioned

Posted Date:-2022-02-17 12:11:08

## Question: ``` The magnetic properties of a material are due to the existence of ___________ ```

1. Electrons in atoms

2.Electric dipole moment

3.Magnetic dipole moment

4.None of the mentioned

Posted Date:-2022-02-17 10:33:10

## Question: ``` The output response of a non-linear circuit is given by the expression: ```

1.V0=a0+a1Vi1+a2Vi2+a3Vi3â€¦

2.0=a0+a1Vi1

3.V0=a2Vi2+a3Vi3

4.V0=a0

Posted Date:-2022-02-17 12:01:54

## Question: ``` The resistance of the PIN diode with positive bias voltage: ```

1.Increases

2.Decreases

3.Remains constant

4.Insufficient data

Posted Date:-2022-02-17 12:44:45

## Question: ``` The width of depletion region of a varactor diode ________with increase in reverse bias voltage. ```

1.IncreasesIncreases

2.Decreases

3.Remains constant

4.None of the mentioned

Posted Date:-2022-02-17 12:56:44

## Question: ``` Varactor diode is a semiconductor diode in which the _________ can be varied as a function of reverse voltage of the diode. ```

1.Junction resistance

2.Junction capacitance

3.Junction impedance

4.None of the mentioned

Posted Date:-2022-02-17 12:54:17

## Question: ``` Varactors made of ______ have higher frequency range of operation compared to silicon fabricated varactor diodes. ```

1.Germanium

2.GaAs

3.GaN

4.None of the mentioned

Posted Date:-2022-02-17 12:58:01

## Question: ``` Varactors made of ______ have higher frequency range of operation compared to silicon fabricated varactor diodes. ```

1.Germanium

2.GaAs

3.GaN

4.None of the mentioned

Posted Date:-2022-02-17 12:58:28

## Question: ``` Varactors made of ______ have higher frequency range of operation compared to silicon fabricated varactor diodes. ```

1.Germanium

2.GaAs

3.GaN

4.None of the mentioned

Posted Date:-2022-02-17 12:58:37

## Question: ``` When the electric field applied to GaAs specimen is less than the threshold electric field, the current in the material: ```

1.increases linearly

2.decreases linearly

3.increases exponentially

4.decreases exponentially

Posted Date:-2022-02-17 13:08:11

## Question: ```. In a non-linear device, for a single input frequency the output will consist of: ```

1.Single frequency component

2.Harmonics of the input frequency

3.Constant gain

4.None of the mentioned

Posted Date:-2022-02-17 12:03:18

## Question: ```A PIN diode consists of ______number of semiconductor layers. ```

1.Three

2.Two

3.Four

4.one

Posted Date:-2022-02-17 12:30:26

## Question: ```A receiver has a noise figure of 7 dB, gain of 40 dB, noise temperature is 290 K. then the noise power at the receiver is: ```

1.47. 4 dBm

2. -47.4 dBm

3.23 dBm

4. -23 dBm

Posted Date:-2022-02-17 12:26:53

## Question: ```Active devices like diodes and transistors become non-linear at high power levels due to: ```

1.Instability of transistor

2.Thermal noise

3. Gain compression

4.None of the mentioned

Posted Date:-2022-02-17 12:00:27

## Question: `After demagnetization of a magnetic material, the residual magnetization retained in the magnetic material is called:`

1.Remanence

2.Residue

3.Retardation

4.None of the mentioned

Posted Date:-2022-02-17 10:43:17

## Question: `An amplifier has a noise equivalent temperature of 170 K. If the amplifier is used with a source having an equivalent noise temperature of TS=450 K, the output noise power of the amplifier is:`

1. -50 dBm

2.-60 dBm

3.-60.7 dBm

4.-55 dBm

Posted Date:-2022-02-17 11:57:17

## Question: ```An X- band amplifier has a gain of 20 dB and a gain of 1GHz bandwidth. Noise figure of the amplifier is -62 dBm at 290 K and -64.7 dBm at 77 K. then the Y factor of the amplifier is : ```

1.3 dB

2.6.4 dB

3.2.7 dB

4.5.6 dB

Posted Date:-2022-02-17 11:53:51

## Question: ```Equivalent noise temperature associated with an arbitrary white noise source is: ```

1.N0/GKB

2.N0

3. N0/ kB

4.None of the mentioned

Posted Date:-2022-02-17 11:59:10

## Question: ```Ferrite isolators are ____ port microwave devices. ```

1.Two

2.Three

3.Four

4.None of the mentioned

Posted Date:-2022-02-17 10:44:58

## Question: `For a receiver, 1 dB compression point is 25 dBm and the noise power at the receiver output is -47.4 dBm, the linear dynamic range is:`

1.70 dB

2.72.4 dB

3.68 dB

4.85 dB

Posted Date:-2022-02-17 12:28:23

## Question: ```Forward attenuation provided by a resonance ferrite isolator is: ```

1.Zero

2.Low

3.High

4.None of the mentioned

Posted Date:-2022-02-17 10:57:45

## Question: `Gyrator is a device that produces a phase shift of ____ between the input and output.`

1.90â°

2.180â°

3.45â°

4.None of the mentioned

Posted Date:-2022-02-17 11:23:58

## Question: ```If a ferrite slab provides a phase shift of 48â°/ cm, then the length of the ferrite slab required to produce a phase shift of 180â° is: ```

1.4 cm

2.3.75 cm

3.4.5 cm

4.3.5 cm

Posted Date:-2022-02-17 11:16:44

## Question: ```If a ferrite slab provides a phase shift of 48â°/ cm, then the length of the ferrite slab required to produce a phase shift of 90â° is: ```

1.2.44 cm

2.1.88 cm

3.4.5 cm

4.3.5 cm

Posted Date:-2022-02-17 11:17:49

## Question: ```In a stripline junction circulator, the ferrite material is present in the form of a: ```

1.Slab

2.Ferrite disk

3.Ferrite material is not used in a microstrip circulator

4.Ferrite cubes

Posted Date:-2022-02-17 11:39:19

## Question: ```In the scattering matrix representation of a non-ideal circulator, the diagonal elements of the matrix are: ```

1.Zero

2.One

3.Reflection coefficient Ð“

4.None of the mentioned

Posted Date:-2022-02-17 11:38:36

## Question: ```Parametric amplifier is a ________ amplifier. ```

1.Low noise

2.High gain

3.Low gain

4.High noise

Posted Date:-2022-02-17 13:02:24

## Question: ```Passive intermodulation is significant only when: ```

1.The input signal levels are low

2. Input signal levels are high

3.Input signal is sinusoidal

4.Input signal is exponential

Posted Date:-2022-02-17 12:12:05

## Question: ```Phase shifters are used in _______ where the antenna beam can be steered in space by electronically controlled phase shifters. ```

1.Phased array antennas

2.Dipole array antennas

3.Slot antennas

4.Patch antennas

Posted Date:-2022-02-17 11:14:42

## Question: ```Practically, opposite circulatory in a ferrite circulator can be obtained by: ```

1.Changing the order of port operation

2.Impedance matching the input ports

3.Changing the polarity of the magnetic bias field

4.None of the mentioned

Posted Date:-2022-02-17 11:37:47

## Question: ```Silicon and germanium are called ___________ semiconductors. ```

1. direct gap

2.indirect gap

3.band gap

4. indirect band gap

Posted Date:-2022-02-17 13:06:17

## Question: ```The attenuation of a ________ is very large near the gyro magnetic resonance of the ferrite. ```

1.Linearly polarized wave

2.Circularly polarized wave

3.Left polarized wave

4.Right polarized wave

Posted Date:-2022-02-17 10:50:35

## Question: ```The cutoff frequency for operation of a varactor diode at a specific bias is given by: ```

1.1/2Ï€RSCjv

2. 1/2Ï€CSRjv

3.1/2Ï€âˆšLC

4.None of the mentioned

Posted Date:-2022-02-17 13:00:07

## Question: ```The electric field distribution of the forward and reverse waves in a ferrite slab-loaded waveguide is quite different. This property is used in: ```

1.Field displacement resonator

2.Resonance isolator

3.Waveguide isolator

4.None of the mentioned

Posted Date:-2022-02-17 11:13:35

## Question: ```The isolators constructed using ferrite materials must operate at: ```

1.Gyro magnetic resonance

2.Magnetic resonance

3.Isolator resonance

4.None of the mentioned

Posted Date:-2022-02-17 10:56:20

## Question: ```The junction resistance and capacitance of the intrinsic region in a PIN diode are connected______ in the equivalent circuit of PIN diode. ```

1.Series

2.Parallel

3.Connected across package capacitance

4.None of the mentioned

Posted Date:-2022-02-17 12:44:01

## Question: `The length of a ferrite slab required operating with a minimum forward insertion loss and 30 dB reverse attenuation and the reverse attenuation at this point is:`

1.3 cm

2.2.4 cm

3.4 cm

4.3.6 cm

Posted Date:-2022-02-17 11:11:22

## Question: ```The material out of which PIN diode is made is: ```

1.Silicon

2.Germanium

3.GaAs

4.None of the mentioned

Posted Date:-2022-02-17 12:31:15

## Question: ```The matrix of an ideal isolator is not ______ ```

1.Unitary

2.Symmetric

3.Lossless

4.None of the mentioned

Posted Date:-2022-02-17 10:46:01

## Question: ```The matrix of an ideal isolator is not ______ ```

1.Unitary

2.Symmetric

3.Lossless

4.None of the mentioned

Posted Date:-2022-02-17 10:48:05

## Question: ```The noise power associated with a two port network modeled as thevinin equivalent is: ```

1.kTB

2.k/TB

3.TB/ K

4.None of the mentioned

Posted Date:-2022-02-17 11:58:02

## Question: ```The operating point of a permanent magnet is in the: ```

Posted Date:-2022-02-17 10:40:06

## Question: ```The relation between an intercept points referenced at the input versus the output is given by the relation: ```

1.OIP3=G (IIP3)

2.(IIP3) = G (OIP3)

3.OIP3=G (IIP3)2

4.None of the mentioned

Posted Date:-2022-02-17 12:05:54

## Question: ```The scattering matrix of a gyrator is: ```

1.Symmetric

2.Skew symmetric

3.Identity matrix

4.Null matrix

Posted Date:-2022-02-17 11:32:38

## Question: `The total number of ones in the scattering matrix of an ideal circulator is:`

1.4

2.3

3.5

4.2

Posted Date:-2022-02-17 11:36:30

## Question: ```The type of noise caused by vibration of bound charges is called: ```

1.Thermal noise

2.Shot noise

3.Flicker noise

4.None of the mentioned

Posted Date:-2022-02-17 11:50:01

## Question: `The Y factor of an amplifier obtained by measuring the noise figure at the temperatures 77 K and 290 K is 2.7 db. Then the equivalent noise temperature of the amplifier is:`

1.100 K

2.150 K

3.170 K

4.None of the mentioned

Posted Date:-2022-02-17 11:56:26

## Question: ```The ________property of devices like diodes and transistors is responsible for their usage in amplifiers and frequency convertors. ```

1.Symmetry

2.Non linearity

3.Linearity

4.None of the mentioned

Posted Date:-2022-02-17 12:01:06

## Question: ```This is not an example of anisotropic material: ```

1.Yttrium aluminum garnet

2.Aluminum

3.Cobalt

4.Silicon

Posted Date:-2022-02-17 10:31:58

## Question: ```Under ideal conditions, when a PIN diode is used as a switch, the switch must have _______ insertion loss in the ON state. ```

1.Maximum

2.Zero

3.Average

4.Insertion loss cannot be defined for a switch

Posted Date:-2022-02-17 12:46:54

## Question: ```When PIN diode is used as a switch, the expression for insertion loss of the switch is given by: ```

1.10 log (Po/PL)

2.10 log (PL/P0)

3.10 log (PL. Pâ‚’)

4.None of the mentioned

Posted Date:-2022-02-17 12:48:05

## Question: ```When the input frequency consists of more than one closely spaced frequency, it results in: ```

1.Intermodal distortion

2.Gain compression

4.Signal attenuation

Posted Date:-2022-02-17 12:04:56

## Question: ```_______ 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

Posted Date:-2022-02-17 11:33:51

## Question: ```________ is defined as the operating range for which a component or system has desirable characteristics. ```

1.Static range

2.Dynamic range

3.Characteristic gain

4.None of the mentioned

Posted Date:-2022-02-17 12:10:23

## Question: ```________ noise is caused by random motion of charges in ionized gas. ```

1.Plasma noise

2.Quantum noise

3.Thermal noise

4.Flicker noise

Posted Date:-2022-02-17 11:52:22

## Question: `________ noise occurs due to the random fluctuation of charge in an electron tube.`

1. Flicker noise

2.Shot noise

3.Thermal noise

4.White noise

Posted Date:-2022-02-17 11:51:13

## Question: ```__________ is a measure of the relative contributions of the orbital moment and the spin moment to the total magnetic moment. ```

1.Landeâ€™s factor

2.Gibbs factor

3.Newtonâ€™s ratio

4.None of the mentioned

Posted Date:-2022-02-17 10:37:18

## Question: ```__________ is a measure of the relative contributions of the orbital moment and the spin moment to the total magnetic moment. ```

1.Landeâ€™s factor

2.Gibbs factor

3.Newtonâ€™s ratio

4.None of the mentioned

Posted Date:-2022-02-17 10:37:50

## Question: ```___________ is an amplifier constructed using a device whose reactance is varied to produce amplification. ```

1.Travelling wave tube

2.Parametric amplifier

3.Common emitter

4.Klystron amplifier

Posted Date:-2022-02-17 13:01:20

## More MCQS

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