Question 61. . A certain transmission line uses a dielectric material with a dielectric strength of 2.25. The velocity of propagation of electromagnetic signal down the line would be

Question 62. . In a particular transmission line, electromagnetic waves were found to travel with a velocity of 2.7 x 1010cm/s. Its velocity factor is

Question 63. . The length of a transmission line connected from the output of the transmitter to the antenna is 10m. The length of another transmission line connected from the output of the same transmitter to another antenna is 10.5 m if the signal frequency is 100 MHz, the signals reaching the two antennas will have a phase difference of

Question 64. . A certain transmission line has four discontinuities with reflection co-efficients of j and 6 The 3 ' 4 overall reflection co-efficient on this line is approximately equal to

Question 65. . The characteristic impedance of a transmission line is

Question 66. . Short circuited stubs are preferred over open circuited stubs because the latter

Question 67. . A given transmission line when open circuited at the load end has an input impedance of (Z1) and when short circuited, it has an input impedance of (Z2). The characteristic impedance of the line is

Question 68. . If R, L, G and C are respectively the resistance, inductance, conductance and capacitance per unit length of a transmission line, then the Heaviside condition for a distortionless transmission line is

Question 69. . An c,pen cipcuited (X14) line has an input impedance of

Question 70. . A short circuited (X/4) line has an input impedance of