| 1. | HEMT used in the microwave circuit is a ? | |
|
source
|
||
|
low noise amplifier
|
||
|
detector
|
||
|
high power amplifier
|
||
View Answer
Discuss in Forum
Report Question| 2. | In a microwave circuit with waveguides, what is a 'waveguide twist' used for ? | |
|
Rotating plane of polarization
|
||
|
Impedance matching
|
||
|
Phase shifting
|
||
|
Rotating Poynting vector
|
||
| 3. | The variation of resistance of an element with absorption of microwave power is the underlying principle of operation of a/an ? | |
|
Phase shifter
|
||
|
Bolometer
|
||
|
Attenuator
|
||
|
Wave filter
|
||
| 4. | The minimum and maximum VSWR is ? | |
|
0 and 1
|
||
|
1 and infinity
|
||
|
0 and infinity
|
||
|
-1 and 1
|
||
| 5. | Slotted line with tunable probe is not used to measure ? | |
|
Power
|
||
|
VSWR
|
||
|
Impedance
|
||
|
Wavelength
|
||
| 6. | The following device is not used for pulse operation ? | |
|
BWO
|
||
|
Multicavity klystron
|
||
|
CFT
|
||
|
TWT
|
||
| 7. | A match load is one in which ? | |
|
reflection is unity
|
||
|
reflection is zero
|
||
|
partial reflection and partial transmission
|
||
|
None of the above
|
||
| 8. | In microwave telemetry, repeater stations are required to cover large area. What is, generally, the distance between repeater stations ? | |
|
100 km
|
||
|
40 km
|
||
|
10 km
|
||
|
20 km
|
||
| 9. | In microwave power measurements using bolometers, the principle of working is variation of ? | |
|
resistance with absorption of power
|
||
|
capacitance with absorption of power
|
||
|
cavity dimensions with heat generated by the power
|
||
|
inductance with absorption of power
|
||
| 10. | In a reflex klystron, the velocity modulation ? | |
|
occurs in the resonator gap
|
||
|
occurs near the accelerating
|
||
|
does not occur at all
|
||
|
occurs near the reflector
|
||