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
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
A calorimetric measurement for average power of a signal gave a value of 400 W. The value was interpreted for peak power as 0.5 MW. Then the duty cycle of the signal is? Mark as favorite Copy Link 40 per cent 0.08 per cent 80 per cent 8 per cent Check Answer
The amounts of time-average energies stored in electric and magnetic field for p-th mode of a cavity resonator will be? Mark as favorite Copy Link equal in the case of spherical cavities always equal equal in the case of fundamental mode of oscillation equal provided the Q-factor is very high Check Answer
A 50 ohm coaxial line is connected to a 72 ohm load through a 60 ohm coaxial section of length 7.5 mm. What is the input VSWR on the line if it is fed by a 20 GHz source? Mark as favorite Copy Link 1.0 1.25 1.44 1.33 Check Answer
The correct statement is? Mark as favorite Copy Link Microstrip lines cannot support pure TEM mode of propagation but shielded coaxial lines can Microstrip lines can support pure TEM mode of propagation but shielded coaxial lines cannot Neither microstrip lines nor shielded coaxial lines can support pure TEM mode of propagation Both microstrip lines and shielded coaxial lines can support pure TEM mode of propagation Check Answer