Related Questions

দেওয়া আছে (i) অর্ধপরিবাহীর Majority carrier election, (ii) p-type অর্ধপরিাবাহীর Majority carrier hole এবং (iii) pure অর্ধপিরবাহীর Majority carrier hole । নিচের কোনটি সঠিক?
A i ও ii
B ii ও iii
C i ও iii
D i, ii, ও iii
A form of modulation In which the amplitude of a carrier wave is varied in accordance with some characteristic of the modulating signal, is known as
A Aloha
B Angle modulation
C Amplitude modulation
D modem
E None of the above
As the modulation level is increased, the carrier power ___________
A Is increased
B Remains the same
C Is decreased
D None of the above
"An Electromagnetic wave falls on to a boundary between two losses less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted on to the second media". This phenomenon is known as:
A Fresnel reflection
B Fresnel refraction
C Snell's law
D None of these
কোনটি মিথ্যা? i. ডায়োডের ক্ষেত্রে বিনাশী ভোল্টেজের পর তড়িৎ প্রবাহের মান সম্মুখ ঝোঁকে নী (Knee) ভোল্টেজের পর থেকে প্রাপ্ত তড়িৎ প্রবাহ থেকে বেশি না ii. ট্রায়োডের দুটি টার্মিনাল থাকে iii. +ve charge carrier এর জন্য প্রবাহিত তড়িৎ প্রবাহ-ve charge carrier জন্য প্রবাহিত তড়িৎ প্রবাহ থেকে কম না নিচের কোনটি সঠিক?
A i ও ii
B i ও iii
C ii ও iii
D i, ii ও iii
The power transmitted by a belt is maximum when the maximum tension in the belt is _________ of centrifugal tension.
A One-third
B Two-third
C Double
D Three times
In Modulation, “carrier” is
A Resultant wave
B Speech voltage to be transmitted
C Voltage with constant frequency, phase or amplitude
D Voltage for which frequency, phase or amplitude is varied
In amplitude modulation, the ___________ of carrier is varied according to the strength of the signal.
A Amplitude
B Frequency
C Phase
D None of the above
Modulation in which the two binary values are represented by two different amplitudes of the carrier frequency is known as
A Amplitude-shift keying
B Amplitude
C Amplitude modulation
D Aloha
E None of the above
One of the advantages of base modulation over collector modulation of a transistor class C amplifier is
A Improved efficiency
B Better linearity
C High power output per transistor
D The lower modulating power requirement

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