Discussion

Match List I with List II and select the correct answer using the codes given below the list :

List I	List II
(a) Klystron	(i) Operates on DC power
(b) Magnetron	(ii) RF amplification by kinetic energy
(c) Gunn diode	(iii) High level injection
(d) PIN diode	(iv) Operation between 10 GHz to 1 THz

Answer: B

The correct matching is a-ii, b-i, c-iv, d-iii.

Klystron: electrons are velocity-modulated and bunched, and their kinetic energy is converted into RF energy, giving RF amplification (ii).
Magnetron: a crossed-field oscillator that runs from a DC anode supply and converts that DC power into microwave power (i).
Gunn diode: a transferred-electron device used as an oscillator in the range of about 10 GHz up towards 1 THz (iv).
PIN diode: works by high-level injection of carriers into its intrinsic region, which makes it a current-controlled resistor at microwave frequencies (iii).

Only one code pairs the klystron with RF amplification by kinetic energy, its defining principle.

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