1) The dominant mode frequency of a waveguide is with air separating the parallel plates of waveguide. By introducing the dielectric with (
instead of air , the dominant frequency of the waveguide
a) Increases
b) Decreases
c) Remains same
d) Zero
2) Air filled waveguide has a dominant mode cut off frequency of 9 GHz. One of the dimensions of the waveguide is
a) 4.3 cm
b) 1.66 cm
c) 3.3 cm
d) 0.8 cm
3) A 50 ohm characteristic impedance line is connected to load which has a reflection coefficient of 0.268. If vin=15v, net power delivered to load will be
a)0.139 W
b)1.39 W
c)0.278 W
d)2.78 W
4) A waveguide has a separation of 3 cm for the broader dimension and carries the dominant mode at an unknown frequency. If the wave impedance is 550 ohm, the unknown frequency f is
a) 7.66 GHz
b) 8.66 GHz
c) 6.66 GHz
d) 10.66 GHz