| 1. | A slot line is etched on the ground plane of a microstrip. Coupling between the slot line and the microstrip, on the two sides of the same substrate, takes place through which one of the following mechanisms ? | |
|
The coupling is electric and is the minimum when they are at right angles
|
||
|
The coupling is magnetic and is the minimum when they are at right angles
|
||
|
The coupling is electric and is the maximum when they are parallel
|
||
|
The coupling is magnetic and is the maximum when they are at right angles
|
||
View Answer
Discuss in Forum
Report Question| 2. | A microstrip line of 50 ohm is terminated in Z=40j30 ?. What is the VSWR of the load ? | |
|
1.8
|
||
|
2.0
|
||
|
1.3
|
||
|
1.5
|
||
| 3. | Consider the following statements: A travelling wavetube is a 1. broad-band amplifier. 2. linear beam amplifier. 3. crossed field amplifier. 4. solid-state amplifier. Which of the statements given above are correct ? | |
|
2 and 4
|
||
|
1, 3 and 4
|
||
|
1 and 2
|
||
|
2 and 3
|
||
| 4. | Consider the following diodes: 1. Gunn diode. 2. Schottky diode. 3. Crystal diode. 4. Tunnel diode. Which of these can be used as detector diodes ? | |
|
1 and 2 only
|
||
|
3 and 4 only
|
||
|
2 and 3 only
|
||
|
1, 2, 3 and 4
|
||
| 5. | At microwave frequencies, a varactor diode may NOT be useful ? | |
|
as an oscillator
|
||
|
for electronic tuning
|
||
|
for frequency multiplication
|
||
|
as a parametric
|
||
| 6. | An isolator is a ? | |
|
four-port network
|
||
|
two-port network
|
||
|
three-port network
|
||
|
one-port network
|
||
| 7. | In a microwave measurement set-up, the power reaching to the load is found to be 50 mW. If a 3 dB coupler is placed before the load, the power to the load will be ? | |
|
25 mW
|
||
|
125mW
|
||
|
50 mW
|
||
|
6.25 mW
|
||
| 8. | In the standing wave detector method for measuring a slightly mismatched load impedance, the distance from the load position to the nearest voltage minimum towards the generator is one-eight the guide wavelength. The load is ? | |
|
a capacitive impedance
|
||
|
an inductive impedance
|
||
|
a pure capacitance
|
||
|
a pure inductance
|
||
| 9. | In an air line, adjacent maxima are found at 12.5 cm and 37.5 cm. The operating frequency is ? | |
|
300 MHz
|
||
|
1.5 GHz
|
||
|
1.2 GHz
|
||
|
600 MHz
|
||
| 10. | Which of the following three terminal microwave transistors preferred for making MMIC's ? | |
|
BJTS
|
||
|
JFETS
|
||
|
HBJTS
|
||
|
MESFETs
|
||