Digital Data Communications : CSE TUTORIALS - Y.Phanikumar, RV Shashank

DATA COMMUNICATIONS

DEPARTMENT OF CSE (3-1)

Faculty:  Y.Phani Kumar    &   R.V.Shasanka 

TUTORIAL-1                     Date: 30-6-2015 & 1-07-2015

1.A signal with a power of 10mW is transmitted through coaxial cable. Signal level measured at the other end is 5mW. What is the loss of the cable?

2. A 50 ohm transmission line is terminated in an impedance of 20-j50.Calculate the reflection Coefficient?

TUTORIAL-2                     Date: 7-7-2015 & 8-07-2015

      1. The power content of the carrier of an AM wave is 5 kW.Determine the power content of each of the sidebands and the total power transmitted when the carrier is modulated 75%.

    2. An AM wave has a power content of 800 W at its carrier frequency. Determine the power content  of each of the sidebands for a 90% modulation.

TUTORIAL-3                     Date: 14-7-2015 & 15-07-2015

1.       If a 6-MHz band were being considered for use with the same standards that apply to the 88-108MHz band, how many FM stations can be accommodated?

TUTORIAL-4                     Date: 21-7-2015 & 22-07-2015

                                                                                                       

1.       Determine the bandwidth of a narrowband FM signal which is generated by a 4-kHz audio signal modulating a 125MHz carrier.

TUTORIAL-5                     Date: 28-7-2015 & 29-07-2015

1.       How much power will an antenna having a radiation resistance of 50 ohm radius when it is fed 20A?

2.       What is the radiation resistance of an antenna which radiates 5 kW when it draws 15A?

TUTORIAL-6                         Date: 4-8-2015 & 5-8-2015

1.       An antenna having a radiation resistance of 75 ohm is radiating 10kW.How much current flows into the antenna?

                                            

TUTORIAL-7                         Date: 11-8-2015 & 12-8-2015

1.       Determine the Q of an antenna if it has a bandwidth 0f 0.6MHz and is cut to a frequency of 30MHz.

2. How many 600 kHz waves can be on a 5-mile transmission line simultaneously?

TUTORIAL-8                        Date: 8-9-2015 & 9-9-2015

1.       Determine the characteristic impedence of a transmission line which has a capacitance of   

35pF/ft and inductance of 0.25 microH/ft.

2. Assume Q=50  find  the F and the Bandwidth.

TUTORIAL-9                        Date: 15-9-2015 & 16-9-2015

1. How many broadcast stations can be accommodated in a 100-kHz bandwidth if the highest modulating frequency is 5 kHz?

TUTORIAL-10                     Date: 29-9-2015 & 30-9-2015

1.       Find the bandwidth of a narrowband FM signal which is generated by a 8-kHz audio signal modulating a 250MHz carrier.

2.        Antenna having a radiation resistance of 150ohm is radiating 20kW.How much current flows into the antenna?

 Tutorial-11                         Date: 6-10-2015 & 7-10-2015

   1. Determine the power content of the carrier and each of the sidebands for an AM signal having a percent modulation of 80% and a total power of 2500W.