ACS CA1

 

Part A

1. ASK stands for: 

a) Amplitude Shift Keying b) Amplitude Sharing Keying 

c) Analog Signal Keying d) Amplitude Sampling Key 

2. In FSK, data is represented by changes in: 

 a) Phase b) Frequency c) Amplitude d) Pulse width 

3. Which modulation technique changes the phase of the carrier 

signal? 

 a) ASK b) FSK c) PSK d) QAM 

4. The basic concept of OFDM is: 

a) Single carrier transmission b) Multi-carrier transmission 

c) Pulse width modulation d) Frequency multiplexing 

5. QPSK transmits: 

a) One bit per symbol b) Two bits per symbol c) Three bits 

per symbol d) Four bits per symbol 

6. The orbit in which a satellite remains fixed relative to the earth is 

called: 

a) Polar orbit b) Elliptical orbit c) Geostationary orbit d) 

Low earth orbit 

7. The point nearest to Earth in the satellite orbit is known as: 

 a) Apogee b) Perigee c) Nadir d) Zenith

8. TDMA stands for: 

a) Time Division Multiple Access b) Time Delay Multiple Access 

c) Time Dependent Modulation Access d) Transmission Data 

Modulation Access 

9. The frequency band used for satellite communication is: 

 a) HF b) VHF c) C band d) MF 

10. GPS is primarily used for: 

a) Audio transmission b) Positioning and navigation c) 

Video compression d) Digital signal processing