## Microwave Measurements MCQ

Microwave Measurements MCQ, Multiple Choice Questions on Microwave Measurements, Objective Questions on Microwave Measurements, Engineering MCQ, Microwave Engineering Engineering MCQ,

### Multiple Choice Questions

Q.1. The microwave bench in the lab is designed to work in the band ________

- X band
- L band
- S band
- C band

**Answer:** X band

Q.2. The mode used in the laboratory bench is ________

- dominant mode
- degenerate mode
- any one of the above two
- none

**Answer:** dominant mode

Q.3. The cutoff wavelength of the bench is ________

- 2
*a* - 2
*b* *cf*- none

**Answer:** 2*a*

Q.4. The method used to measure high VSWR is ________

- slotted-line method
- Double minimum method
- both
- none

**Answer:** Double minimum method

Q.5. Low VSWR method can be used to measure VSWR up to ________

- ten
- five
- three
- none

**Answer:** ten

Q.6. The range of VSWR in dB indicated in the VSWR meter is ________

- 0–2 dB
- 0–10 dB
- 0–5 dB
- 0–100 dB

**Answer:** 0–10 dB

Q.7. The temperature coefficient of the Thermistor is ________

- positive
- negative
- zero
- none

**Answer:** negative

Q.8. Barretters have ________

- positive temp efficient of resistance
- negative temp coefficient of resistance
- both
- none

**Answer:** positive temp efficient of resistance

Q.9. The impedance of the line to the left of voltage minimum is ________

- inductive
- capacitive
- high resistance
- low resistance

**Answer:** inductive

Q.10. The impedance of the line to the right of voltage minimum is ________

- inductive
- capacitive
- high resistance
- low resistance

**Answer:** capacitive

Q.11. The bolometer that has a negative temperature coefficient of resistivity is called

- barretter
- varistor
- thermistors
- calorimeter

**Answer:** thermistors

Q.12. For impedance measurement, the following oscillator is used:

- Reflex klystron tube oscillator
- Gunn oscillator
*both**either reflex klystron or Gunn oscillator*

**Answer:** *either reflex klystron or Gunn oscillator*

Q.13. The “Double Minimum” method is relevant to the measurement of

- low attenuation coefficient
- high attenuation coefficient
- high VSWR
- low VSWR

**Answer:** high VSWR

Q.14. A 75-ohm transmission line is first terminated and the minima locations are noted. When the short is replaced by a resistive load *R _{L}*, the minima locations are not altered and the VSWR is measured to be 3. What is the value of

*R*?

_{L}- 25 ohms
- 50 ohms
- 225 ohms
- 250 ohms

**Answer:** 225 ohms

Q.15. On a resistively terminated high-frequency loss-less transmission line fed by a 500 MHz source, the VSWR is found to be equal to 2 and the first voltage minimum is measured at 30 cm from the load end. What is the value of the “normalized” load resistance?

- 3
- 2
- 1/2
- 1/4

**Answer:** 2