# Analog Communications Questions and Answers – Intersymbol Interference

This set of Analog Communications Multiple Choice Questions & Answers (MCQs) focuses on “Intersymbol Interference”.

1. What is the full-form of UTP?
a) Unshielded Twisted-Pair copper wire
b) Unshielded Twisted-Pair Coaxial wire
c) Uniquely Twisted-Pair copper wire
d) Uniquely Twisted-Pair Coaxial wire

Explanation: UTP stands for Unshielded Twisted-Pair copper wire. Unshielded in UTP refers to the lack of metallic shielding around copper wires. The twisted pair helps to minimize electronic interference.

2. NIC stands for ________
a) Network Interface Card
b) Network Interface Cable
c) Network Interface Code
d) Network Internal Cord

Explanation: NIC stands for Network Interface Card. It is a computer circuit board that is installed in a computer so that it can be connected to a network.

3. Why CSMA/CD network has a maximum length for cables?
a) to increase the data rate
b) to decrease the data rate
c) to prevent packets from reaching all other nodes
d) to make sure that all other nodes hear a collision in progress

Explanation: CSMA/CD is a media access control used in early Ethernet technology for local area networking. Cables used in CSMA/CD has a maximum length when compared to others to make sure that all other nodes hear a collision in progress.

4. The Clapp oscillator is _________
a) an oscillator made using FET
b) a type of crystal controlled oscillators
c) modified form of Colpitts oscillator
d) modified form of Hartley oscillator

Explanation: Clapp oscillator is just an advanced form of Colpitts oscillator.

5. What is the total voltage, when two noise voltage V1 and V2 are combined?
a) $$\sqrt{V_1 \times V_1 + V_2 \times V_2}$$
b) $$\frac{V_1 + V_2}{2}$$
c) $$\sqrt{V_1 \times V_2}$$
d) V1 + V2

Explanation: When two noise voltage V1 and V2 are combined, the resulting total voltage VT comes out to be $$\sqrt{V_1 \times V_1 + V_2 \times V_2}$$.
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6. Shot noise is generated in ________
a) resistors
b) inductors
c) transistors and diodes
d) capacitors

Explanation: Shot noise originate from the discrete nature of electric charge. It is mostly generated in transistors and diodes.

7. Radians per second is equal to _________
a) 2πf
b) phase angle
c) phase deviation
d) phase swing

Explanation: Radians per second is equal to the value 2πf.

8. Repeaters are not required for fiber optic cable lengths upto ________
a) 10km
b) 100km
c) 5km
d) 12km

Explanation: Repeaters are devices which help in retransmitting a signal more powerfully. If the length of fiber optic cable is up to 100 km, there is no need for repeaters in that circuit.

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