The colour of an object is decided by
A). The reflected colour
B). The wavelength transmitted through it
C). Reflected colour for opaque object and wavelength transmitted through it for transparent objects
D). None of the above
Full duplex operation permits transmission in both directions at the same time.
A). True
B). False
In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then
A). Amplitude of distant sidebands decreases
B). Amplitude of distant sidebands increases
C). Amplitude of distant sidebands remains constant
D). Amplitude of distant sidebands first increases, then decreases
The main function of a balanced modulator is to
A). Produce balanced modulation of a carrier wave
B). Produce 100% modulation
C). Suppress carrier signal in order to create a single-sideband or double sideband
D). Limit noise picked by a receiver
For telegraphy the most commonly used modulation system is
A). FSK
B). Two tone modulation
C). PCM
D). Single tone modulation