Unit -1

The amplitude modulation is the process in which amplitude of the carrier signal changes with respect to _____________ signal

• Modulating signal

• Carrier signal

• Suppressed carrier

• None of the above

The full-duplex is a _________ system

• Unidirectional communication

• Multidirectional communication

• Bidirectional communication

• None of the above

Why the carrier signal doesn’t carry any signal?

• Frequency is constant

• Phase and amplitude constant

• Amplitude is Constant

• All of the above

The standard form of PAM is _________

None of the above

• Positive Amplitude Modulation

• Phase Amplitude Modulation

• Pulse Amplitude Modulation

• All the above

The half-duplex is a _________ system

• Bidirectional communication

• Unidirectional communication

• Multidirectional communication

• None of the above

The antenna height is equal to ______

• h=λ/8

• h=λ/4

• h=λ/2

• None of the above

The advantages of the modulation are _______

• High energy of carrier

• Multiplexing is possible

• Noise can be reduced

• All of the above

______ is the process in which amplitude of the sinusoidal carrier signal changes with respect to message or modulating signal

• Pulse amplitude modulation

• Frequency modulation

• Angle modulation

• Amplitude modulation

The envelope detector is __________

• Effective for detection of narrow band AM signal

• Simple

• Both a and b

• None of the above

In ______ modulation the phase of the carrier signal is modulated by the message signal

• Amplitude modulation

• Pulse modulation

• Phase modulation

• Frequency modulation