A Best Way To Crack Gorenment Job Exams

Electronics Engineering Objective Questions { Microwave Devices and Circuits }



169. Characteristic impedance of a waveguide with cross-sectional dimensions 5 cm and 4 cm and (cut-off frequency/frequency of operation) ratio equal to 0.6, assuming relative dielectric constant to be 9, is
A. 200 Q
B.400
C. 75 Q
D. indeterminate from the given data
Discuss in Forum

170. In a series-tee, the axis of the side-arm
A. is parallel to the H-field planes of the main waveguide
B. is parallel to the E-field of the main waveguide
C. is normal to the E-field of the main waveguide
D. none of these
Discuss in Forum

171. In a shunt-tee, the axis of the side-arm is in
A. the plane of E-field of main waveguide
B. the plane of H-field of main waveguide
C. a plane normal to the H-field of the main waveguide
D. none of these
Discuss in Forum

172. There is a directional coupler consisting of two waveguides with a commonside wall (the one parallel to E-field) having two holes space (S) cm in the common wall.Then
A. coupling factor is a function of spacing (S)
B. coupling tactor is independent of spacing (S)
C. directivity is independent of spacing (S)
D. none of these
Discuss in Forum

173.  A device that makes possible the use of same antenna for transmission and reception both is
A. the duplexer
B. the magic-tee
C. the crystal diode
D. none of these
Discuss in Forum

174. Most of the power measuring microwave devices measure
A. average power
B. peak power
C. instantaneous power
D. none of these
Discuss in Forum

175.  A bolometer that is having a negative temperature co-efficient of resistivity is called
A. barretor
B. varistor
C. bead thermistor
D. none of these
Discuss in Forum

Page 25 of 28

« 23 24  25  2627 »