M*NDO

In Amplitude Modulation, the carrier is changed by a modulating signal. What parameter of the carrier is changed

• Frequency

• amplitude

• phase

• pulse width

At cut-off frequencies, the net reactance is _______ the resistance of the circuit

• greater than

• equal to

• less than

• none of the above

At resonant frequency, the voltage across the capacitor is ______ the voltage across the inductor

• greater than

• equal to

• less than

• greater than or less than

What is the electrical wavelength of a 500 MHz signal?

• 60 m

• o.o6 m

• 6 m

• 60 cm

Thermal noise power in a resistor is

• proportional to R

• proportional to 1/R

• proportional to R²

• independent on R

A device that converts high frequency current into an electromagnetic wave

• Antenna

• microphone

• loudspeaker

• transducer

If a MHz carrier is amplitude modulated with a 5KHz audio signal, the upper side frequency is _____KHz

• 1005

• 900

• 1000

• 995

Answer explanation

Upper Sideband Frequency = Carrier Frequency +

Modulating Signal Frequency Upper Sideband Frequency = 1,000,000 Hz (1 MHz) + 5,000 Hz (5 kHz)

Upper Sideband Frequency = 1,005,000 Hz

So, the upper sideband frequency is 1,005,000 Hz or 1005 kHz.

The process of impressing intelligence on the carrier is called

• detection

• impression

• mixing

• modulation

The difference between the RF carrier and the modulating signal frequencies is called the

• upper side frequency

• carrier

• lower side frequency

• sideband