Week2 CU

A full duplex communications system can communicate in both directions but only in one direction at any one time.

• True

• False

The shown system is full duplex.

• True

• False

A multiplexer changes the flow of the signal from parallel to series. True or False?

• True

• False

Pulse Modulation is.

• Analogue

• Digital

• Both

• None

The monitored triplex redundancy system in aircrafts can survive.

• 1 fault

• 2 faults

• 3 faults

• 0 Faults

A voice signal has frequencies between 5 kHz and 20 kHz. What is the bandwidth of this signal?

• 15 kHz

• 20 kHz

• 5 kHz

• 25 kHz

A voice signal has frequencies between 5 kHz and 25 kHz. What is the bandwidth of the AM modulated signal of 30 MHz?

• 30 MHz

• 60 MHz

• 50 KHz

• 40 KHz

Calculate the modulation index of the AM signal if H = 6V and h = 1.5V.

• 0.66

• 1.66

• 0.6

• 0.3

Calculate 'm' of the AM signal if the peak to peak amplitude of the carrier signal is 10V and V_B rms is 2.

• 0.4

• 0.57

• 0.2

• 0.28

A voice signal contains frequencies 750 Hz and 1.5 KHz modulated with a carrier of 15 MHz. Find the bandwidth of the SSB.

• 0.75 KHz

• 1.5 KHz

• 3 KHz

• 30 MHz