MCQ
When the modulating frequency is doubled, the modulation index is halved and the modulating voltage remains constant, the modulation system is
  • A
    Amplitude modulation
  • B
     Phase modulation
  •  Frequency modulation
  • D
     All of the above

Answer

Correct option: C.
 Frequency modulation
Frequency modulation

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

If the decay or disintegration constant of a radioactive substance is $\beta $, then its half life and mean life are respectively 

$(log_e \,2 =ln\, 2)$

Which series of hydrogen atom lie in infrared region?
From a newly formed radioactive substance (Half life $2$ hours), the intensity of radiation is $64$ times the permissible safe level. The minimum time after which work can be done safely from this source is ..........$hours$
A coaxial cable having radii $a, b$ and $c$ carries equal and opposite currents of magnitude $i$ the inner and outer conductors. What is the magnitude of the magnetic induction at point $P$ outside of the cable at a distance $r$ from the axis?
If the dielectric constant and dielectric strength be denoted by $k$ and $x$ respectively, then a material suitable for use as a dielectric in a capacitor must have
A planoconvex lens becomes an optical system of $28\, cm$ focal length when its plane surface is silvered and illuminated from left to right as shown in Fig $-A$. If the same lens is instead silvered on the curved surface and illuminated from other side as in Fig. $B$, it acts like an optical system of focal length $10 \,cm$. The refractive index of the material of lens is
A $3\, volt$ battery with negligible internal resistance is connected in a circuit as shown in the figure. The current $I$, in the circuit will be ............. $A$
Which state of triply ionised Baryllium $(Be^{+++})$ has the same orbital radius as that of the ground state of hydrogen 
Two equal positive point charges are kept at points $A$ and $B$ . The electric potential, while moving from $A$ to $B$ along straight line
In the figure, the value of resistors to be connected between $C$ and $D$ so that the resistance of the entire circuit between $A$ and $B$ does not change with the number of elementary sets used is