Telecom Basic Questions

1.       The OSI model was developed by ISO in the year___________

a.       1985

b.      1988

c.       1965

d.      1984

2.       The other name of directional antenna is..

a.       Omni-directional antenna

b.      Sectored antenna

c.       Isotropic antenna

d.      Yagi-Uda antenna

3.       The main purpose of multi plexer is..

a.       Combine voice and data traffic

b.      Perform error detection and correction

c.       Reduce network costs

d.      Perform analog to digital conversion

4.       Walkie – Talkie is the best example for..

a.       Simplex

b.      Half-Duplex

c.       Full Duplex

d.      None

5.       ATM Packet Size is

a.       50 octets

b.      53 octets

c.       56 octets

d.      64 octets

6.       In phase modulation the signal has________ phase and___________ phase.

a.       180,180

b.      90, 90           

c.       0,180

d.      0, 0

7.       What is Buffering?

a.   The process of temporarily storing the data to allow for small variation in device speeds

b.  A method to reduce cross talks

c.   A method to reduce routing overhead

d.  Storage of data within transmitting medium until the receiver is ready to receive

8.       Line of sight is...

a.    Straight Line

b.   Parabolic

c.    Tx and Rx should be visible to each other

d.   None of the above

9.       The layers of the OSI model, from the top -down, are

a.       Application, Presentation, Session, Transport, Network, Data link, Physical

b.      Session, Presentation, Data transport, MAC, Network, Physical

c.       Presentation, Application, Session, Network, Transport, Data link, Physical

d.      Application, Encryption, Network, Transport, Logical link control, Physical

10.   Quadrature Amplitude Modulation (QAM) is a combination of ___________.

a.       ASK & FSK

b.      FSK & PSK

c.       PSK & ASK

d.      None

11.   Transmission media are usually categorized as _______.

a. Fixed or Unfixed

              b. Guided or Unguided

              c. Determinate or Indeterminate

              d. Metallic or Nonmetallic

12.   When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, _______ occurs.

a.       Reflection

b.      Refraction

c.       Incidence

d.      Criticism

13.   Which of the following is a type of fiber connector:

a.       SC

b.      ST

c.       MTRJ

d.      All of the above

       14. GSM allows a reuse factor of _______.

a.       1

b.      3

c.       5

d.      7

      15) What is the modulation method used in GSM at Air interface ?

                a)Pulse Code Modulation

                b)Quadrature Amplitude Modulation

                 c) GMSK Modulation

                 d )PSK Modulation        

    

   16)  Multipath Fading is also called as

a) Lognormal Fading

b) Shadow fading

c ) Rayleigh Fading

d ) Rician Fading

         17) GSM is the digital standard for Europe; what do the letters GSM currently mean?

 a) Global Special Mobile

             b)Greater System's Mobile

 c) Global Systems for Mobile Communications

 d) None of the above!

     18)  Full Rate Speech Coding is at

                a) 9.6 Kbps

                b) 13 Kbps

                c) 6.5 Kbps

                d) 4.8 Kbps

       19) _______ is a first-generation cellular phone system.

           a) AMPS

           b) D-AMPS

           c) GSM

           d) None

      20) MEO satellites are located at altitudes between km.

           a) 3000 and 5000

           b) 5000 and 10,000

           c) 5000 and 15,000

           d) None