FM & PM
Trending Questions
Q. A sonometer wire of length L, has fundamental frequency ν. If it is plucked at L/8 from the fixed end, then the frequency of the wire is (1) ν (2) 2ν (3) 3ν (4) 4ν
Q.
In frequency modulated wave
Frequency varies with time
Amplitude varies with time
Both frequency and amplitude vary with time
Both frequency and amplitude are constant
Q. If a black wire of platinum is heated, then it's colour first appears to be red, then yellow and finally white. This observation can be understood on the basis of
- None of these
- Wien's Displacement law
- Newton's law of cooling
- Expansion on heating
Q. A 500 Hz modulating voltage fed into an FM generator produces a frequency deviation of 2.25 kHz. If amplitude of the voltage is kept constant but frequency is raised to 6 kHz then the new deviation will be
- 4.5 kHz
- 54 kHz
- 27 kHz
- 15 kHz
Q. Why is the frequency of a closed organ pipe is 1:3:5
Q. An oscillator is producing FM waves of frequency 2 kHz with a variation of 10 kHz. What is the modulating index
- 0.2
- 5
- 0.67
- 1.5
Q. A 500 Hz modulating voltage fed into an FM generator produces a frequency deviation of 2.25 kHz. If amplitude of the voltage is kept constant but frequency is raised to 6 kHz then the new deviation will be
- 4.5 kHz
- 54 kHz
- 27 kHz
- 15 kHz
Q. The carrier frequency generated by a tank circuit containing 1 nF capacitor and 10 μ H inductor is
- 1592 Hz
- 159.2 MHz
- 159.2 kHz
- 159.2 Hz
Q. A wire of density 9x10^3 kg/m^3 is stretched between two clamps 1m apart and is subjected to an extension of 4.9x10^-4m .What will be the lowest frequency of the vibrations?