Tuesday, 10 February 2015

Recently asked Bluetooth Interview Questions and Answers (Page 5)

Below are some important Bluetooth interview questions which are asked in most MNC company interviews for beginners or professionals.
41. Give a generic description of Bluetooth?
Bluetooth is a low-cost, short-range (RF) links between mobile PCs, mobile phones and other portable devices. Bluetooth can transmit through solid, non-metal objects.

42. How does Bluetooth use frequency hopping for security?
Bluetooth picks a random frequency out of 79 and then hops around the range about 1600 times per second.

43. Why is Bluetooth called a cable replacement technology?
Bluetooth technology allows the creation of Personal Area Networks without cables or wires that are usual in home networks.

44. What is FCC and how does it relate to Bluetooth?
FCC is Federal Communication Commission, which issues licenses to the stations for specific frequencies. It also decides who is able to use which frequency for what purpose. Since Bluetooth is using unlicensed spectrum, FCC has no direct involvement with Bluetooth

45. What is FEC in Bluetooth?
Forward Error Correction is a method by which Bluetooth increases its noise immunity. FEC is a method that enables a receiver to not only detect, but also correct errors in a transmission.

46. What is Airport?
Airport is a wireless communications system, like Bluetooth. It is based on the IEEE 802.11 recommendation. It also uses 2.4 GHz frequency band, but its range is about
45 meters and it boasts a transmission speed of 11 Mbit/second. It is developed by Lucent Technologies.

47. Which technology is used in Bluetooth for avoiding interference?
Frequency hopping is the technology used in Bluetooth.

48. How many SCO links are there in a piconet?
In a piconet, there can be up to three SCO links of 64,000 bits per second each.

49. Which Bluetooth version uses adaptive frequency hopping? Why?
In Version 1.2 Adaptive frequency hopping method is used, which improves resistance to radio interference, and provides higher transmission speed.

50. Is it possible to connect multiple Bluetooth hubs?
No, only one hub can be used at a time with a computer. USB or Serial devices can be added.
More Questions & Answers :-
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