A cavity wavemeter is connected parallel to a waveguide transmission line which terminates in a resistive load. The microwave power reaching the load-end is monitored by a power meter. As the cavity wavemeter is tuned to the resonant frequency of the input signal through the waveguide assembly, the power indicated by the power meter will show? Mark as favorite Copy Link a steady level rapid fluctuations a sudden dip a sudden rise Check Answer
On a slotted line terminated in a load, the minima of the standing wave pattern measured by a square-law device, are located at (on a cm scale) 9.5, 11.0, 12.5 and 14.0. At 10.95 and 11.05 the detected level being twice the minimum level. The VSWR on the line is? Mark as favorite Copy Link 10 20 30 50 Check Answer
For using as a local oscillator for frequency measurements, the most suitable microwave source would be? Mark as favorite Copy Link reflex klystron travelling wave tube magnetron double cavity klystron Check Answer
To avoid difficulties with strapping at high frequencies, what type of cavity structure is used in the magnetron? Mark as favorite Copy Link Slot Hole and slot Rising sun Vane Check Answer
Gallium arsenide is preferred to silicon for use in Gunn diode because it has? Mark as favorite Copy Link lower noise at high frequencies suitable empty energy band which silicon does not have high ion mobility better frequency stability Check Answer
A diode with no junction that is widely used with a cavity resonator to form a microwave oscillator is a/an? Mark as favorite Copy Link IMPATT diode GUNN diode TRAPATT diode TUNNEL diode Check Answer
Which of the following uses transferred electron effect’ for production of microwaves? Mark as favorite Copy Link Germanium Silicon Gallium arsenide Metal-semiconductor junction Check Answer
In the Gunn diode, out of its various modes of operation, one mode is independent of domain transit time and hence can be used at high frequency and for very high output powers. Which is this mode? Mark as favorite Copy Link Transit time mode Limited space charge accumulation mode Quenched domain mode Delay domain mode Check Answer
The main purpose of inserting a microwave isolator in a microwave circuit is for? Mark as favorite Copy Link maintaining frequency stability of the source offering minimum forward impedance maintaining amplitude stability of output power offering maximum power output from the source Check Answer
A rectangular metal waveguide filled with a dielectric material of relative permittivity Er= 4 has the inside dimensions 3.3 cm x 1.2 cm. The cut-off frequency for the dominant mode is? Mark as favorite Copy Link 12.5 GHz 2.5 GHz 10.0 GHz 5.0 GHz Check Answer