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Physics
Modulation of signals
Why is PCM called a Modulation Technique?

Physics
Modulation of signals
What is Frequency Deviation in FM?
Physics
Modulation of signals
Modulation is used to:
A. reduce the bandwidth
B. To separate the transmission of different users
C. To ensure that intelligence may be transmitted to long distances
D. To allow the uses of practical antenna
Physics
Modulation of signals
What is angle modulation and its types?
Physics
Modulation of signals
What happens in over modulation?

Physics
Modulation of signals
What is digital modulation and its types?

Physics
Modulation of signals
A transmitter supplies $9{\text{ kW}}$ to the aerial when unmodulated. The power radiated when modulated to $40\%$ is:
A. ${\text{ 5 kW}}$
B. ${\text{ 9}}{\text{.72 kW}}$
C. ${\text{ 10 kW}}$
D. ${\text{ 12 kW}}$
Physics
Modulation of signals
The action of impressing intelligence upon a transmission medium is referred to as
A. Modulating
B. Demodulating
C. Heterodyning
D. Wave generating
Physics
Modulation of signals
What are the applications of Amplitude modulation?
Physics
Modulation of signals
A carrier voltage of peak voltage $12V$is used to transmit a message signal. What should be the peak voltage of the modulating signal to have a modulation index of $75\%$?
Physics
Modulation of signals
Area under a speed-time graph gives.
A. The time is taken by the moving object
B. The distance traveled by the moving object
C. The acceleration of a moving object
D. The retardation of a moving object
Physics
Modulation of signals
The types of modulation employed in India for radio transmission is.
A. Pulse modulation.
B. Frequency modulation
C. Amplitude modulation.
D. Phase modulation
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