When is the speed of the satellite maximum in an elliptical orbit?
a) Retrograde
b) Posigrade c) Perigee d) Apogee

The time period taken by the satellite to complete one orbit is called ________
a) Lapsed time
b) Time period c) Sidereal period d) Unit frequency

What is the angle of inclination for a satellite following an equatorial orbit?
a) 0°
b) 180° c) 45° d) 90

The angle between the line from the earth station’s antenna to the satellite and the line between the earth station’s antenna and the earth’s horizon is called as ___________
a) Angle of inclination
b) Angle of elevation c) Apogee angle d) LOS angle

Which of the following provides a buffer between the user and the low-level interfaces to the hardware?
a) operating system
b) kernel c) software d) hardware

Which of the following enables the user to utilise the system efficiently?
a) kernel
b) operating system c) software d) hardware

Which of the following can make the application program hardware independent?
a) software
b) application manager c) operating system d) kernel

Which forms the heart of the operating system?
a) kernel
b) applications c) hardware d) operating system

Which of the following bus can easily upgrade the system hardware?
a) control bus
b) data bus c) VMEbus d) bus interface unit

What are the main features of a receiver?
a) Synchronization
b) Multiple parallel receiver chain c) Synchronization & Multiple parallel receiver chain d) None of the mentioned

What conditions must be fulfilled in a good digital communication system?
a) High data rate
b) High fidelity c) Low transmit power d) All of the mentioned

Wired channels are
a) Lossy
b) Lossless c) Lossy & Lossless d) None of the mentioned

The equivalent temperature in a receiver design must be kept
a) Low
b) High c) Does not affect the receiver d) None of the mentioned

Which corrects the sampling time problem in a digital system?
a) Interpolator
b) Decimator c) Equalizer d) Filter

Transmission media used in low frequency band are
a) Air
b) Water c) Copper cable d) All of the mentioned

Transmission media used for medium frequency band are
a) Coaxial cable
b) Copper cable c) Optical fiber d) All of the mentioned

Matched filter technique is used to
a) Increase SNR
b) Decrease SNR c) SNR is not affected d) None of the mentioned

Matched filter can also be used as least squares estimator.
a) True
b) False

Digital communication system can handle
a) Analog signals
b) 1D signals c) 2D signals d) All of the mentioned

The information source of a digital communication system can be
a) Packetized
b) Continuous c) Packetized & Continuous d) None of the mentioned

The basic transmission-reception system is a ______ system.
a) Two block system
b) Three block system c) Four block system d) None of the mentioned