Top 150+ Solved Radiation and Microwave Techniques MCQ Questions Answer
Q. If a device is passive and contains no anisotropic elements, then the deviceis_______ network.
a. reciprocal
b. non reciprocal
c. lossless
d. lossy
Q. If a microwave network is lossless, then S matrix of the microwave network is:
a. zero matrix
b. symmetric
c. identity matrix
d. unitary
Q. The junction resistance and capacitance of the intrinsic region in a PIN diode areconnected______ in the equivalent circuit of PIN diode.
a. series
b. parallel
c. connected across package capacitance
d. none of the mentioned
Q. The width of depletion region of a varactor diode ________with increase in reversebias voltage.
a. increases
b. decreases
c. remains constant
d. none of the mentioned
Q. When a reverse bias voltage exceeding the breakdown voltage is applied to anIMPATT diode, it results in:
a. break down of depletion region
b. avalanche multiplication
c. high reverse saturation current
d. none of the mentioned
Q. Micro strip can be fabricated using:
a. photo lithographic process
b. electrochemical process
c. mechanical methods
d. none of the mentioned
Q. ________ is a single cavity klystron tube that operates as on oscillator by using areflector electrode after the cavity.
a. backward wave oscillator
b. reflex klystron
c. travelling wave tube
d. magnetrons
Q. Klystrons operates on the principal of
a. amplitude modulation
b. frequency modulation
c. pulse modulation
d. velocity modulation
Q. Which of the following can be used for amplification of microwave energy?
a. magnetron
b. reflex klystron
c. traveling wave tube
d. gunn diode
Q. When the electric field applied to GaAs specimen is less than the threshold electricfield, the current in the material:
a. increases linearly
b. decreases linearly
c. increases exponentially
d. decreases exponentially
Q. The primary purpose of the helix in a traveling-wave tube is to
a. prevent the electron beam from spreading in the long tube
b. reduce the axial velocity of the rf field
c. ensure broadband operation
d. reduce the noise figure
Q. A cavity resonator can be represented by
a. an lc circuit
b. an lcr circuit
c. a lossy inductor
d. a lossy capacitor
Q. Ionospheric preparation is not possible for microwaves because
a. microwaves will be fully absorbed by the ionospheric layers
b. there will be an abrupt scattering in all directions
c. microwave will penetrate through the ionospheric layers
d. there will be dispersion of microwave energy
Q. Which of the following is not possible in a circular wave guide ?
a. te10
b. te01
c. te11
d. te12
Q. The maximum theoretical output circuit efficiency of a double resonator klystronamplifier is
a. 25%
b. 50%
c. 58%
d. 85%