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ISRO EC Quiz 2 : Microwave Engineering
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Question 1
Two half-wave dipole antennas placed as shown in the figure are excited with sinusoidally varying currents of frequency 3 MHz and phase shift of π/2 between them (the element at the origin leads in phase). If the maximum radiated E-field at the point P in the x-y plane occurs at an azimuthal angle of 60o the distance d (in meters) between the antennas is ____________.
Question 2
If the diameter of a 
dipole antenna is increased from 
, then its
dipole antenna is increased from , then its Question 3
The normalized radiation intensity of an antenna in spherical coordinates is given by
U = sin
sin
, 
The directivity of antenna is given by _______.
U = sin
sin, The directivity of antenna is given by _______.
Question 4
For an 8 feet (2.4 m) parabolic disk antenna operating at 4 GHz, the minimum distance required for far field measurement is closest to
Question 5
The electric field of an electromagnetic wave propagating in the positive z direction is given by
The wave is
The wave is
Question 6
The magnetic field intensity vector of a plane wave is given by 
where 
denotes the unit vector in y direction. The wave is propagating with a phase velocity
where denotes the unit vector in y direction. The wave is propagating with a phase velocity Question 7
A good current buffer has
Question 8
A 30-Volts battery with zero source resistance is connected to a coaxial line of characteristic impedance of 50 Ohms at t = 0 second terminated in an unknown resistive load. The line length is that it takes 400 Js for an electromagnetic wave to travel from source end to load end and vice-versa. At t = 400 µs, the voltage at the load end is found to be 40 Volts.
The steady-state current through the load resistance is:
The steady-state current through the load resistance is:
Question 9
In the circuit using an ideal opamp, the 3-dB cut-off frequency (in Hz) is __________.
Question 10
A 1 cm
2.5cm rectangle wave guide filled with a lossless dielectric material 
is excited at a frequency 
,where 
is the cut off frequency of the guide. If the guide operates in TE10 mode, then the distance along the guide at which the signal strength decreases to 1 percent of the excitation is given by _______cm.
2.5cm rectangle wave guide filled with a lossless dielectric material is excited at a frequency ,where is the cut off frequency of the guide. If the guide operates in TE10 mode, then the distance along the guide at which the signal strength decreases to 1 percent of the excitation is given by _______cm. - 530 attempts
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