Question

27. The time required for a voltage pulse to travel the length of a 50 0hm cosxial cable is a function of the a) length of the cable. b) distributed inductance and capacitance of the cable. c) impedance used to terminate the cable. 28. The technical (as opposed to technical and economical) specifications for the low pass filter of the final design project could be satisfied with a a) third order Butterworth filter. b) fifth order Chebyshev filter. c) forth or higher order Chebyshev filter 29. A microstrip transmission line formed using two pieces of copper strip would be expected to work best as a transmission line if a) the strips were connected together as smoothly and symmetrically as possible. b) the strips were separated by a small air gap. c) the strips were of the same width. 30. The constructed filter for the design project a) included resistors, capacitors and op amps. b) was evaluated by measuring the frequency response at several critical frequencies. c) was evaluated by comparing the measured frequency response with the design spec and the responses obtained from MATLAB analysis. 31. Antenna operating bandwidth can be measured by: a) monitoring the reflection coefficient of the antenna versus frequency b) placing the antenna close to reflecting objects. c) monitoring the Su magnitude values with antenna input connected to VNA port 1. 32. Resonant frequency of a microstrip patch antenna depends on: a) length of the patch. b) dielectric constant of substrate c) height of substrate. the sinusoidally frequency modulated (FM) signal is 33. The instantaneous frequency of a function of the a) carrier frequency b)amplitude of the modulating signal c) frequency of the modulating signal 34. The frequency spectrum of a sinusoidally frequency modulated (FM) signa a) always includes the carrier frequency b) may include multiple sidebands c) includes frequency components which may be measured using the scope FFT capability s. The vector network analyzer used in the laboratory can be used to measure a)signal magnitude and phase at frequencies from 1 Hz to 50KHz. b)phase of signals at frequencies from 2 MHz to 6 GlHz magnitude of signals at frequencies from 8.0 GHz to 12.4 GHz 36. For a two port microwave device, the scattering parameter Sii is a measure of: a) power reflected from the device b) power wave out of port 1 divided by the power wave into port 1 c) power coupled through the device 37. For a two port microwave device, scattering parameter Sı is a measure of a) power reflected from the device b) power transmitted through the device c) power wave out of port 2 divided by the power wave into port 1 38. Manual calibration of a network analyzer typically requires: a) open and short circuit measurements -specifications for cable lengths c) matched load measurements 39. When measuring a 4 port device with a two port network analyzer, the two unused ports of the device should be terminated with: a) an open circuit b) a short circuit c) a matched load 40. Trimming the corner of a sharp microstrip bend is intended to a) decrease the power reflected from the microstrip. decrease the power transmitted through the microstrip. c) save space on the microstrip circuit board.

Answer 1

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