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
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
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
For a shunt configuration switch, the diode impedance is 40 Ω and the terminated line characteristic impedance is 50 Ω. 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
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
Gain of a parametric amplifier in terms of the frequencies involved in their operation is:
1.(fP – fS)/fS
2. fS/ (fP – fS)
3. fP/fS
4.None of the mentioned
Posted Date:-2022-02-17 13:05:13
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
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
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
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
In the series configuration of a PIN diode switch, the terminated load impedance was found to be 50 Ω 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
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
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
The output response of a non-linear circuit is given by the expression:
1.V0=a0+a1Vi1+a2Vi2+a3Vi3…
2.0=a0+a1Vi1
3.V0=a2Vi2+a3Vi3
4.V0=a0
Posted Date:-2022-02-17 12:01:54
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
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
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
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
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
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
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
. 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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
In the scattering matrix representation of a non-ideal circulator, the diagonal elements of the matrix are:
1.Zero
2.One
3.Reflection coefficient Г
4.None of the mentioned
Posted Date:-2022-02-17 11:38:36
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
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
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
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
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
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
The cutoff frequency for operation of a varactor diode at a specific bias is given by:
1.1/2Ï€RSCjv
2. 1/2Ï€CSRjv
3.1/2π√LC
4.None of the mentioned
Posted Date:-2022-02-17 13:00:07
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
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
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
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
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
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
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
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
The operating point of a permanent magnet is in the:
1.First quadrant
2.Second quadrant
3.Third quadrant
4.Fourth quadrant
Posted Date:-2022-02-17 10:40:06
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
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
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
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
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
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
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
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
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
When the input frequency consists of more than one closely spaced frequency, it results in:
1.Intermodal distortion
2.Gain compression
3.Signal fading
4.Signal attenuation
Posted Date:-2022-02-17 12:04:56
_______ 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
________ 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
________ 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
________ 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
__________ is a measure of the relative contributions of the orbital moment and the spin moment to the total magnetic moment.
1.Lande’s factor
2.Gibbs factor
3.Newton’s ratio
4.None of the mentioned
Posted Date:-2022-02-17 10:37:18
__________ is a measure of the relative contributions of the orbital moment and the spin moment to the total magnetic moment.
1.Lande’s factor
2.Gibbs factor
3.Newton’s ratio
4.None of the mentioned
Posted Date:-2022-02-17 10:37:50
___________ 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