If unloaded Q due to conductor loss and unloaded Q due to dielectric loss is 29390 and 2500 respectively, then the total unloaded Q of the circular cavity is:

A circular cavity resonator has a wave number of 151, radius of 2.74 cm, and surface resistance of 0.0184Ω. If the cavity is filled with a dielectric of 2.01, then unloaded Q due to conductor loss is:

A

25490

B

21460

C

29390

D

none of the mentioned

Given that the wave number of a circular cavity resonator is 151 (TE011 mode), and the length of the cavity is twice the radius of the cavity, the radius of the circular cavity operating at 5GHz frequency is:

A

2.1 cm

B

1.7 cm

C

2.84 cm

D

insufficient data

The loss tangent for a circular cavity resonator is 0.0004.Then the unloaded Q due to dielectric loss is:

A

1350

B

1560

C

560

D

2500

If the attenuation due to dielectric loss and attenuation due to conductor loss in a microstrip transmission line is 0.024Np/m and 0.0724 Np/m, then the unloaded quality factor if the propagation constant is 151 is:

A

150

B

783

C

587

D

234

A cavity in the shape of a frustum of a cone has diameter 30 cm and 60 cm and the height is 80 cm. If the cavity is maintained at temperature of 800 K, determine the heat loss from the cavity when the smaller diameter is at the bottom

A

6577 W

B

2367 W

C

8794 W

D

3675 W

Consider black body radiation in a cavity maintained at 2000 K. If the volume of the cavity is reversibly and adiabatically increased from 10 cm³ to 640 cm³, the temperature of the cavity changes to

A

800 K

B

700 K

C

600 K

D

500 K

If a dielectric resonator has a dielectric constant of 49, then the reflection coefficient of the dielectric resonator is:

A

0.5

B

0.75

C

0.1

D

0.7

The approximate loaded Q due to dielectric loss for a dielectric resonator given the loss tangent is 0.0001 is:

A

1000

B

500

C

2000

D

10000

Two dielectric materials A and B exhibit both ionic and orientational polarizabilities. The variation of their susceptibilities $$\chi \left( { = {\varepsilon _r} - 1} \right)$$ with temperature T is shown in the figure, where $${\varepsilon _r}$$ is the relative dielectric constant. It can be inferred from the figure that

A

A is more polar and it has a smaller value of ionic polarizability than that of B

B

A is more polar and it has a higher value of ionic polarizability than that of B

C

B is more polar and it has a higher value of ionic polarizability than that of A

D

B is more polar and it has a smaller value of ionic polarizability than that of A

A circular cavity resonator is filled with a dielectric of 2.08 and is operating at 5GHz of frequency. Then the wave number is:

A

181

B

151

C

161

D

216