Top 150+ Solved Radiation and Microwave Techniques MCQ Questions Answer
Q. The number of semiconductor layers in IMPATT diode is:
a. two
b. three
c. four
d. none of the mentioned
Q. The cavity resonator
a. is equivalent to an lc resonant circuit
b. in a reflect klystron has its output taken from the reflector plate
c. produces a frequency which is independent of the cavity size.
d. has a low q factor for narrow operation.
Q. A traveling-wave tube (TWT) amplifies by virtue of
a. the absorption of energy by the signal from an electron stream
b. the effect of an external magnetic field
c. the energy contained the cavity resonators
d. the energy liberated form the collector
Q. Which of the following is used as a high power microwave oscillator?
a. thyratron
b. magnetron
c. klystron
d. reflex-klystron
Q. The characterstic impedance of a transmission line depends upon
a. shape of the conductor
b. surface treatment of the conductor
c. conductivity of the material
d. geometrical configuration of conductors
Q. In order to reduce skin effect at ultra high frequencies,
a. conductors are painted
b. conductors are anodized
c. copper rodes with silver plating are used
d. copper lubes with silver plating are used
Q. Which of the following are constants of transmission lines
a. resistance
b. inductance
c. capacitance
d. all of the above
Q. Indicate the false statement. The SWR on a transmission line is infinity; the line isterminated in
a. a short circuit
b. an open circuit
c. a complex impedance
d. pure reactance
Q. Major advantage of a quarter wave transformer is
a. proper matching
b. high gain
c. broader band width
d. none of the above
Q. The reactances associated with the transmission line due to discontinuities:
a. can be ignored
b. have to be matched
c. discontinuities do no exist
d. none of the above
Q. A loss less line of characteristic impedance Z0 is terminated in pure reactance of -jZ0 value. VSWR is
a. 10
b. 2
c. 1
d. infinity
Q. A rectangular air – filled waveguide has a cross section of 4 × 10 Theminimum frequency which can propagation in the waveguide is
a. 1.5 ghz
b. 2.5 ghz
c. 2.0 ghz
d. 3.0 ghz
Q. Indicate which one of the following modes do not exist in a rectangularresonantcavity
a. te110
b. tm110
c. te011
d. mt111
Q. The phase velocity of waves propagation in hollow metal waveguide is
a. greater than velocity of light in free space
b. less than velocity of light in free space
c. equal to velocity of light in free space
d. equal to group velocity