This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Frequency Multipliers”.

1. __________ is an example for a frequency multiplier.

a) resistor

b) inductor

c) capacitor

d) transistor

2. The major drawback of frequency multipliers is that they have:

a) higher attenuation

b) complex construction methods

c) complex design

d) none of the mentioned

3. Oscillators operating at millimeter wavelength are difficult to realize and are also less efficient.

a) true

b) false

4. A reactive diode multiplier uses _______ as the key electronic component for frequency multiplication.

a) zener diode

b) light emitting diode

c) varactor diode

d) Gunn diode

5. If a frequency multiplier has a multiplication factor of 10, then the increase in noise level due to frequency multiplication is:

a) 10 dB

b) 20 dB

c) 25 db

d) 15 dB

6. Resistive multipliers are more efficient as compared to reactive multipliers.

a) true

b) false

7. A major disadvantage of frequency multipliers is that they multiply the noise factor along with frequency.

a) true

b) false

8. In a diode frequency multiplier, an input signal of frequency f_{o} applied to the diode is terminated with_________ at all frequencies other than required harmonic.

a) real impedances

b) reactive impedance

c) complex impedance

d) none of the mentioned

9. Reactive multipliers have a disadvantage that they cannot be used at very high frequencies and they become less efficient.

a) true

b) false

10. For a resistive frequency multiplier of multiplication factor 2, the maximum theoretical conversion efficiency is:

a) 50 %

b) 25 %

c) 75 %

d) 12.5 %