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The major drawback of frequency multipliers is that they have:The major drawback of frequency multipliers is that they have:
The answer is:
C. complex design


Oscillators operating at millimeter wavelength are difficult to realize and are also less efficientOscillators operating at millimeter wavelength are difficult to realize and are also less efficient.
The answer is:
A. true


A major disadvantage of frequency multipliers is that they multiply the noise factor along with frequencyA major disadvantage of frequency multipliers is that they multiply the noise factor along with frequency.
The answer is:
A. true


If a frequency multiplier has a multiplication factor of 10, then the increase in noise level due to frequency multiplication is:If a frequency multiplier has a multiplication factor of 10, then the increase in noise level due to frequency multiplication is:
The answer is:
B. 20 db


In a diode frequency multiplier, an input signal of frequency fo applied to the diode is terminated with at all frequencies other than required harmonicIn a diode frequency multiplier, an input signal of frequency fo applied to the diode is terminated with at all frequencies other than required harmonic.
The answer is:
B. reactive impedance


Resistive multipliers are more efficient as compared to reactive multipliersResistive multipliers are more efficient as compared to reactive multipliers.
The answer is:
B. false


Reactive multipliers have a disadvantage that they cannot be used at very high frequencies and they become less efficientReactive multipliers have a disadvantage that they cannot be used at very high frequencies and they become less efficient.
The answer is:
A. true


For a resistive frequency multiplier of multiplication factor 2, the maximum theoretical conversion efficiency is:For a resistive frequency multiplier of multiplication factor 2, the maximum theoretical conversion efficiency is:
The answer is:
B. 25 %


is a device that converts electrons to photons or viceversais a device that converts electrons to photons or viceversa.
The answer is:
A. antenna


The basic equation of radiation that is applied to any antenna irrespective of the type of the antenna is:The basic equation of radiation that is applied to any antenna irrespective of the type of the antenna is:
The answer is:
A. il= qv


When the separation between two lines that carry the TEM wave approaches λ the wave tends to be radiatedWhen the separation between two lines that carry the TEM wave approaches λ the wave tends to be radiated.
The answer is:
A. true


The number of patterns radiation pattern required to specify the characteristic are :The number of patterns radiation pattern required to specify the characteristic are :
The answer is:
A. three


The beam width of the antenna pattern measured at half power points is called:The beam width of the antenna pattern measured at half power points is called:
The answer is:
A. half power beam width


An antenna has a field pattern of E (θ) = cos2 θ, θ varies between 0 and 900. Half power beam width of the antenna is:An antenna has a field pattern of E (θ) = cos2 θ, θ varies between 0 and 900. Half power beam width of the antenna is:
The answer is:
B. 660


An antenna has a field pattern E (θ) =cos θ. cos 2θ. The first null beam width of the antenna is:An antenna has a field pattern E (θ) =cos θ. cos 2θ. The first null beam width of the antenna is:
The answer is:
B. 900


The solid area through which all the power radiated by the antenna is:The solid area through which all the power radiated by the antenna is:
The answer is:
A. beam area


Power radiated from an antenna per unit solid angle is called radiation intensityPower radiated from an antenna per unit solid angle is called radiation intensity.
The answer is:
A. true


A is a device that converts a guided electromagnetic wave on a transmission line into a plane wave propagating in free spaceA is a device that converts a guided electromagnetic wave on a transmission line into a plane wave propagating in free space.
The answer is:
A. transmitting antenna


Antennas are bidirectional devices 

Dipole antennas are an example for:Dipole antennas are an example for:
The answer is:
A. wire antennas

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