A lossy transmission line is used to connect a transmitter to an antenna . if the VSWR measured at the antenna end of the transmission line is 1.5...

Q1. A lossy transmission line is used to connect a transmitter to an antenna . if the VSWR measured at the antenna

end of the transmission line is 1.5 which of the following is correct.

a. The VSWR measured at the transmitter end of the transmission line is smaller than 1.5

b. The VSWR measured at the transmitter end of the transmission

Line is larger than 1.5.

c. The VSWR measured at the transmitter end of the transmission line is equal to 1.5

d. The characteristics impedance of the antenna matches exactly the characteristics impedance of the transmission

line.

Q2 An industrial plant is served by a 12470V delta / 480 V grounded -wye transformer . The high voltage side of the

transformer is served from a 12470-VDELTA/480-V wye connected distribution line that has a grounded neutral

.The best protection of the transformer against lighting strikes on the 12,470-v line will result from surge arrester

connections of?

e. Phase to ground on the 12,470-V side of the transformer

f. Phase to phase on the 12,470-V side of the transformer

g. Phase to ground on the 480 V side of the transformer

h. Phase to neutral to ground on the 480-v side of the transformer

Q3.When using the method of symmetrical components which of the following statement is most nearly correct?

a. The three zero- sequence current phasors are equal in magnitude and displaced by 1200

b. The three positive-sequence and the three negative sequence current phasors are all equal in magnitude,

but have opposite phase rotations.

c. In a wye connected synchronous generator ,the voltage drop through the neutral grounding resistor R is

equal to square root of 3 I0 R where I0 is the zero sequence current

d. Positive sequence and negative sequence currents cannot pass through neutral grounding resistor in a wye

connected generator

Q4.If the signal power doubled at a given transmitter what is the decibel increase

a. 0.5 db

b. 2db

c. 3db

d. 4db

Q5.A microwave relay link is used to transmit binary information and has the following specification.

Carrier frequency 6Ghz

Atmospheric loss 0.2 dB / Mile

Transmission bandwidth 24 Mhz

Transmitted symbol rate 22.368 Msymbols/ sec

Transmitted antenna gain 44db

Reciever antenna gain 44db

Receiving system effective input noise temperature 500K

To minimize system noise without degrading transmitted signal quality , the absolute minimum bandwidth (mhz) of the

intermediate frequency (IF)Filter in the receiver should be most nearly.

a. 12.00

b. 22.37

c. 24

d. 48