FME mcq 3

Klystron operates on the principle of-

• Amplitude Modulation

• Frequency Modulation

• Velocity modulation

• Pulse Modulation

A space between two cavities in two cavity klystron is

• Drift space

• Free space

• Running space

• Normal space

The major advantage of TWT over a klystron lies in its

• Higher Bandwidth

• Higher Gain

• Higher Frequency

• Higher Output

The microwave sources used for a micrwave oven is

• Reflex Klystron

• Magnetron

• BWO

• IMPATT Diode

One of the reason why vacuum tubes eventually fail at microwave frequencies is that their

• noise figure increases

• transit time becomes too short

• series inductive reactance becomes too small

• shunt capacitive reactance becomes too large

Most powerful solid state device is

• Gunn

• IMPATT

• MESFET

• Varactor

The biggest advantage of TRAPATT diode over IMPATT is

• low noise

• higher efficiency

• ability to operate at higher frequencies

• lesser sensivity to harmonics

Parametric amplifier operates by the behavior of

• linear reactance

• non linear reactance

• linear resistance

• non linear resistnace

A varactor diode may not be useful at microwave frequencies

• for electronic tuning

• for frequency multiplication

• as an oscillator

• as a parameteric amplifier

IMPATT diode is disadvantageous because of

• high noise

• too many layers

• low efficiency

• difficulty in growing intrinsic layer