# Flexible Manufacturing System Questions and Answers – Communication Standards of DNC Systems – Set 2

This set of Flexible Manufacturing System Multiple Choice Questions & Answers (MCQs) focuses on “Communication Standards of DNC Systems – Set 2”.

1. What are the types of channel used in data communication system?
a) Stable and Unstable
b) Analog and Digital
c) Binary and Quaternary
d) Open and Loop

Explanation: Analog and Digital are the two types of channel used in data communication system. A Communication system is used to send information from one terminal to another terminal without any lag in signal.

2. Which of the following is not a type of transmission mode?
a) Half duplex
b) Duplex
c) Simplex
d) Bypassing

Explanation: Bypassing is not a type of transmission mode. Simplex, Duplex and Half duplex are the three types of transmission mode. These modes can be transmitted either in analog or digital mode.

3. What is the difference between the lowest and the highest frequency of analog signal?
a) Bandwidth
b) Fluctuation
c) Frequency
d) Difference Signal

Explanation: The difference between the lowest and the highest frequency of analog signal is known as Bandwidth. An analog signal usually varies from maximum to minimum signal. Higher the bandwidth, data transfer rate will be maximum.

4. Which of the following is the ratio of velocity to wavelength?
a) Frequency
b) Speed
c) Friction
d) Resonance

Explanation: Frequency is calculated by the ratio of velocity to wavelength. It shows the number of complete cycles appearing in unit time. Frequency is directly proportional to bandwidth i.e., as frequency increases bandwidth increases.

5. What is the process of varying frequency of the carrier signal in accordance with the information signal?
a) Modulation
b) Demodulation
c) Premodulation
d) Post Modulation

Explanation: Modulation is the process of varying frequency of the carrier signal in accordance with the instantaneous value of information signal. It influences data information in the carrier signal so that the mixing of signals will be prevented.

6. What is the process of separating the original information signal from the modulated carrier signal called as?
a) Demodulation
b) Modulation
c) Coordination
d) Processing

Explanation: Demodulation is the process of separating the original information signal from the modulated carrier signal. It inversely processes the data signal which was processed during the process of modulation.

7. What is known as the pattern of interconnection of nodes in a network?
a) Neology
b) Topology
c) Tribology
d) Tetra logy

Explanation: Topology is known as the pattern of interconnection of nodes in a network. It is usually defined by the geometric arrangement of workstations with links provided to transmit signal from one node to another node.

8. Which of the following is not a type of LAN topology?
a) Moon
b) Bus
c) Ring
d) Star

Explanation: Moon Topology is not a type of Local Area Network Topology. Bus Topology, Ring Topology. Star Topology and Mesh Topology are the classifications of Local Area Network Topology. These are hierarchical in nature which is used depending upon user requirements.

9. Transport Layer consists of the hardware that drives the network and circuits.
a) True
b) False

Explanation: The Physical layer consists of the hardware that drives the network and circuits. The lowest layer of Open System Interconnection model is the Physical layer. It helps to set up of the physical connection to the network and reception of signals.

10. What is meant by OSI?
a) Old Systems Interconnection
b) Open Software Interface
c) Old Software Interface
d) Open Systems Interconnection

Explanation: OSI means Open Systems Interconnection. It is a reference model in International Organization for Standardization. It specifies the conceptual structure of systems which are used to communicate with each other.

11. Which layer handles the process of transferring information?
a) Physical Layer
c) Transport Layer
d) Process Layer

Explanation: The process of transferring information is handled by Data Link layer. It transfers information by sending blocks of data across the physical link. It is the second layer of OSI model of communication architecture.

12. Which of the following layer provides transparent transfer of packets to and from the session layer?
b) Network Layer
c) Application Layer
d) Transport Layer

Explanation: Transparent transfer of packets to and from the session layer is done by Transport layer. The function of this layer is to transfer data without any interruption. It is the fourth layer of OSI model of system interconnection.

13. Which layer provides user interface to the networking system?
a) Application Layer
b) Session Layer
c) Transport Layer
d) Process Layer

Explanation: The function of application layer is to provide user interface to the networking system. It is an abstraction layer in which communication protocols which were used by the host in a communication network are shared along with interface methods.

14. Which of the following is the third layer in OSI model?
a) Network Layer
b) Session Layer
c) Application Layer
d) Transport Layer

Explanation: The third layer in Open Systems Interconnection model is the Network layer. The function of this layer is to handle service requests from the transport layer and to forward these requests to the data link layer.

15. Presentation layer is used to present data to the application.
a) True
b) False

Explanation: Presentation layer is used to present data to the application. It is the sixth layer of 7 layer model of OSI architecture. It is otherwise termed as Syntax layer. The data in the application is shown to the user through this layer.

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