This set of Analog Communications Multiple Choice Questions & Answers (MCQs) focuses on “FDM System”.
1. Frequency difference between WDM (Wavelength Division Multiplexing) and FDM (Frequency Division Multiplexing) is ________
c) slightly greater than 1
Explanation: WDM (Wave Division Multiplexing) uses some basic principles of FDM (Frequency Division Multiplexing). FDM is used for analog signals transmitted through twisted pair cable while WDM is used to transmit signals through optical fiber cables. Frequency difference between WDM and FDM is infinity.
2. FDM stands for ________
a) Frequency Determine Multiplexing
b) Finite Difference Method
c) Frequency Division Multiplexing
d) Frequency Data Manager
Explanation: FDM stands for Frequency Division Multiplexing. The total bandwidth is divided into a series of non-overlapping frequency bands and each band is used to carry a separate signal.
3. TDM stands for ________
a) Time Division Multiplexing
b) Time Difference Multiplexing
c) Time Division Method
d) Time Data Method
Explanation: TDM stands for Time Division Multiplexing. It is used to transmit and receive independent signals over a common signal path with the help of synchronized switches.
4. TDM and FDM are used to multiplex multiple signals into a single carrier.
Explanation: Both TDM and FDM are used to multiplex different signals into a single carrier. Multiplexing is the method of combining two or more than two signals into one, in such a way that each individual signal can be retrieved at the receiver.
5. What is Synchronous TDM?
a) gives same amount of time to each device
b) gives same amount of frequency to each device
c) gives variable time to each device
d) gives variable frequency to each device
Explanation: Synchronous TDM gives exactly the same amount of time to each connected device. It allocates time to every device even if a device has nothing to transmit.
6. FDM is an analog multiplexing technique used to combines ________
a) analog signals
b) digital signals
c) both analog and digital signals
d) alternatively passes analog and digital signals
Explanation: FDM is used to multiplex multiple analog signals. FD is applied when the bandwidth of the link is greater than the combined bandwidth of signals to be transmitted.
7. Frequency Division Multiplexing (FDM) is based on orthogonality.
Explanation: Orthogonal frequency division multiplexing is used to encode multiple carrier frequencies. It is mainly used for latest wireless telecommunications.
8. Which multiplexing technique transmits digital signals?
d) Both FDM and TDM
Explanation: Time Division Multiplexing is used to transmit digital signals. FDM and WDM techniques are used to transfer analog signals.
9. To get constant time delay, we should use ________
a) FDM technique
b) WDM technique
c) Synchronous TDM
d) Non synchronous TDM
Explanation: Synchronous Time Division Multiplexing is used to provide constant time delay. It can also provide constant bandwidth.
10. Time Division Multiplexing (TDM) is based on orthogonality.
Explanation: Both Frequency Division Multiplexing (FDM) and Time Division Multiplexing (TDM) are based on orthogonal multiplexing.
11. As distance increases ________
a) Packet size also increases
b) Packet size decreases
c) Packet size becomes twice of its previous value
d) Packet size becomes half
Explanation: Distance is directly proportional to packet size. So as distance increases packet size also increase.
12. If 32 equally probable events exists and we have to select one of them, number of required bits is?
Explanation: 25 = 32, so number of bits required is 5.
Sanfoundry Global Education & Learning Series – Analog Communications.
To practice all areas of Analog Communications, here is complete set of 1000+ Multiple Choice Questions and Answers.