Question

46. What is meant by the term deviation ratio? a. The ratio of the audio modulating frequency to the center carrier frequency. b. The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency c. The ratio of the carrier center frequency to the audio modulating frequency d. The ratio of the highest audio modulating frequency to the average audio modulating frequency. 47. What is a wave front? a. A voltage pulse in a conductor. b. A current pulse in a conductor. C. A voltage pulse across a resistor. d. A fixed point in an electromagnetic wave. 48. How is a frequency counter used? a. To provide reference points on an analog receiver dial thereby aiding in the alignment of the receiver. b. To heterodyne the frequency being measured with a known variable frequency oscillator until zero beat is achieved, thereby indicating what the unknown frequency is. c. To measure the deviation in an FM transmitter in order to determine the percentage of modulation d. To measure the time between events, or the frequency which is the reciprocal of th time. 49. A(n) can be combined to measure the characteristics of transmission lines and such an arrangement is known as a time-domain reflectometer (TDR). a. Frequency spectrum analyzer, RF generator. b. Oscilloscope, pulse generator. C. AC millivolt meter, AF generator. d. Frequency counter, linear detector. and 50. What factors limit the accuracy, frequency response, and stability of a D'Arsonval movement type meter? a. Calibration, coil impedance and meter size. b. Calibration, series resistance and electromagnet current. c. Coil impedance, electromagnet voltage and movement mass. d. Calibration, mechanical tolerance, and coil impedance. 51. Which of the following contains a multirange AF voltmeter calibrated in dB and a sharp, internal 1000 Hz bandstop filter, both used in conjunction with each other to perform quieting tests? a. Reflectometer. b. Dip meter C. SINAD meter. d Vector-impedance meter.

Answer 1

46) Deviation Ratro Maximcem freq. Deviation Marimcem Modulation frequency Ans: ophon B b. Ratio of maximum caros iesa frequency devia- ution to dhe highest audio modulating freq. 48) A frequency counter used to measure time between events, or the frequency which is occiprocal of time Aniso op hond 49) Time Domain Reflectometei (TDR) Block diagram cable assembly under Puese test Pulse Gener :-ator load mts Oscilloscope lanss Option b. pulse generator and oscilloscope cs Scanned with CamScanner

516 Anscool is SINAD Meter Topmon :c Block diagram of Sinad Meteor Input AGO AGD plifier delector Absolute of Calue 1000 Hz Precision rechthel band shop filles cs Scanned with CamScanner