Description : Electronic equipment used to measure standing wave ration. A. Reflectometer B. Wavemeter C. Altimeter D. Multimeter
Last Answer : A. Reflectometer
Description : Used to test a fiber optics splice ∙ a. Spectrum analyzer ∙ b. Oscilloscope ∙ c. Optical power meter ∙ d. Field strength meter
Last Answer : c. Optical power meter
Description : What device measures rf power by measuring the heat the rf power generates? A. Calorimeter B. Goniometer C. Spectrum meter D. Oscilloscope
Last Answer : A. Calorimeter
Description : ___________ is device that measures the internal open circuit voltage of an equivalent noise generator having an impedance of 600Ω and delivering noise power to a 600 Ω load. A. Psophometer B. Barometer C. Reflectometer D. Voltmeter
Last Answer : A. Psophometer
Description : One of the following is referred to as a major component of an optical time domain reflectometer A. Pulse generator and vertical plate B. Laser and horizontal plate C. Pulse generator laser D. Vertical and horizontal plate
Last Answer : C. Pulse generator laser
Description : Which of the following best describes a dip-meter? A. An SWR meter B. A counter C. A variable LC oscillator with metered feedback current D. A field strength meter
Last Answer : C. A variable LC oscillator with metered feedback current
Description : A transmission line of unknown impedance is terminated with two different resistances, and an SWR is measured each time. With a 75 Ω termination, the SWR measures 1.5. With a 300 Ω termination, it measures 2.67. What is the impedance of the line? A. 100 Ω B. 212 Ω C. 300 Ω D. 112 Ω
Last Answer : D. 112 Ω
Description : Best described a dip-meter. A. A variable LC oscillator with metered feedback current B. An SWR meter C. A counter D. A field strength meter
Last Answer : A. A variable LC oscillator with metered feedback current
Description : The outer conductor of a coaxial transmission line is always grounded at the A. Input only B. Input and output C. Output only D. Point of high SWR
Last Answer : B. Input and output
Description : In FFT Spectrum Analyzer, FFT stands for _______. (A) Frequency Fourier Transform (B) Fast Fourier Transmission (C) Frequency Fourier Transmission (D) Fast Fourier Transform
Last Answer : (D) Fast Fourier Transform
Description : The display screen of a spectrum analyzer presents a graphic plot of what two signal characteristics?
Last Answer : Power and frequency.
Description : A spectrum analyzer is designed to display what signal characteristic?
Last Answer : Amplitude versus frequency (the frequency domain of the signals).
Description : Indications of spectrum analyzer is presented by means of
Last Answer : a CRT
Description : Describe block diagram of spectrum analyzer and explain its working
Last Answer : Fig: Block Diagram of Spectrum analyzer. 1. Spectrum analyzer consists of voltage tune oscillator, mixer, IF amplifier, detector, video amplifier, sweep generator and CRT. 2. The input ... on the screen. 8. In this type the signal are broken down into their individual frequency component.
Description : State any four applications of spectrum analyzer.
Last Answer : Applications: 1. Spectrum analyzer is a very important item of test equipment for someone designing or repairing electronic equipment that uses radio frequency signals. 2. Its key factor is that it is ... of the dominant frequency within a signal 8. Used to measure the properties of RF devices
Description : Spectrum analyzer
Last Answer : Spectrum analyzer Spectrum analyzer is use for measuring signal in frequency domain. It measure modulation, distortion and noise. Spectrum analyzer measure the electrical input signal, for measuring ... of the signal. Other control include dynamic range, sweep speed and resolution bandwidth.
Description : An instrument for recording waveforms of audio frequency. A. Oscilloscope B. Phonoscope C. Radioscope D. Audioscope
Last Answer : B. Phonoscope
Description : How does an oscilloscope measure frequency and voltage?
Last Answer : Maybe not the most helpful, but here’s a schematic of a digital oscilloscope: http://www.sparkfun.com/datasheets/Kits/DIY-Oscope-schematic.pdf
Description : A multimeter is used to measure – (1) current (2) voltage (3) resistance (4) All of the above
Last Answer : (4) All of the above Explanation: A multimeter or a multitester, also known as a VOM (Volt-Ohm meter), is an electronic measuring instrument that combines several measurement functions in ... or digital circuits-analog multimeters (AMM) and digital multimeters (often abbreviated DMM or DVOM.)
Description : When reading AC current with the multimeter shown in the illustration and you are unsure of the range, the range switch should be set to ___________. EL-0047 A. 10 MA/ 10 AMP with leads in the (-10 A ... leads in the (-COMMON) and (+10 A) jacks D. unable to measure AC current with this multimeter
Last Answer : Answer: D
Description : A multimeter can be used to directly measure _____________. A. watts B. field flux C. current D. all of the above
Last Answer : Answer: C
Description : A multimeter can be used to measure _____________. A. resistance B. voltage C. current D. all of the above
Description : You are calibrating a multimeter using internal batteries to supply power for resistance measurements. However, you are unable to adjust the pointer to 'zero' using the adjustment knob. Therefore, you should ... change scales to the R X 100 scale and adjust using the 'zero ohms' adjusting knob
Last Answer : Answer: A
Description : Which of the listed statements is correct when using an analog multimeter as an ohmmeter? A. The pointer should be adjusted to zero each time a new resistance range is selected. B. The ... C. Ohmmeters are not sufficiently sized to measure conductor insulation resistance. D. All of the above.
Description : A multimeter is used to measure (1) current (2) voltage (3) resistance (4) All of the above
Last Answer : All of the above
Description : Which of the following is not part of the optical spectrum? a. Infrafed b. Ultraviolet c. Visible color d. X-rays
Last Answer : d. X-rays
Description : What is the spectrum of stereophonic FM signal? A. 19 to 38 kHz B. 30 to 53 kHz C. 59.5 to 74.5 kHz D. 88 to 108 MHz
Last Answer : B. 30 to 53 kHz
Description : How far is the visual carrier from the lowest frequency in the spectrum of a monochrome TV broadcast channel following the NTSC standard? A. 1.5 MHz B. 1.25 MHz C. 4.5 MHz D. 0.25 MHz
Last Answer : B. 1.25 MHz
Description : What is the spectrum range of U600 mastergroup? A. 60 – 108 kHz B. 564 – 3084 kHz C. 312 – 552 kHz D. 60 -2788 kHz
Last Answer : B. 564 – 3084 kHz
Description : What term is used to describe a spread spectrum communications system in which a very fast binary bit stream is used to shift the phase of an RF carrier? A. Frequency hopping B. Direct sequence C. Binary phase-shift keying D. Phase compandored spread spectrum
Last Answer : B. Direct sequence
Description : What is the term used to describe a spread spectrum communications system where the center frequency if a conventional carrier is altered many time per second in accordance with a pseudo ... hopping B. Direct sequence C. Time-domain frequency modulation D. Frequency compandored spread spectrum
Last Answer : A. Frequency hopping
Description : How many voice signals (4 kHz max.) would fit into a 5 MHz spectrum? A. 1250 B. 500 C. 1000 D. 1500
Last Answer : A. 1250
Description : What connector is popular in attaching test instruments like oscilloscopes, frequency counters, spectrum analyzers, etc? A. UHF connector B. PL-259 C. BNC D. SMA
Last Answer : C. BNC
Description : Where does the AM broadcast band located in the spectrum band? A. HF band B. VHF band C. LF band D. MF band
Last Answer : D. MF band
Description : Determine from the following radio frequency that falls under the very high frequency band of the radio spectrum. A. 345.00 MHz B. 144.50 MHz C. 235.50 MHz D. 450.00 MHz
Last Answer : C. 235.50 MHz
Description : The extremely high frequency (EHF) band is in the radio spectrum range of _______. A. 30 to 300 kHz B. 30 to 300 GHz C. 3 to 30 MHz D. 3 to 30 GHz
Last Answer : B. 30 to 300 GHz
Description : A radio frequency in the ultra high frequency band of the radio spectrum band. A. 235.50 MHz B. 450.50 MHz C. 150.50 GHz D. 0.31250 GHz
Last Answer : D. 0.31250 GHz
Description : How wide is the spectrum bandwidth of a single GSM carrier? A. 100 kHz B. 200 kHz C. 50 kHz D. 16 kHz
Last Answer : B. 200 kHz
Description : Which of the following fall under the high frequency band of the radio spectrum? A. 8.2345 MHz B. 150.50 MHz C. 2.4555 MHz D. 35.535 MHz
Last Answer : A. 8.2345 MHz
Description : The method of determining the bandwidth of any processing system is ______. A. Bandwidth analysis B. Frequency spectrum C. Spectral analysis D. Frequency analysis
Last Answer : C. Spectral analysis
Description : The frequency spectrum of the stereophonic FM signal. A. 67 kHz B. 59.5 to 74.5 kHz C. 19 to 38 kHz D. 30 to 53 kHz
Last Answer : D. 30 to 53 kHz
Description : What is the main advantage of using a time-domain reflectometer (tdr) to test a transmission line?
Last Answer : Tdr will indicate the nature of and the distance to or location of any faults.
Description : OTDR stands for ∙ a. Optical Time Domain Reflectometer ∙ b. Optical Transmit Direction Return ∙ c. Optical Time Domain Time Regeneration ∙ d. Overtime Direct Reference
Last Answer : c. Optical Time Domain Time Regeneration
Description : OTDR stands for: a. Optical Time-Delay Response b. Optical Timing Delay Requirement c. Optical Time-Domain Reflectometer d. Optical Time-Division Relay
Last Answer : c. Optical Time-Domain Reflectometer
Description : The minimum impedance of a 75 ohm transmission line with a SWR of 2.5 is a) 100 b) 50 c) 25 d) 30
Last Answer : d) 30
Description : The maximum impedance of a 50 ohm transmission line with SWR of 3 is a) 50/3 b) 3/50 c) 150 d) 450
Last Answer : c) 150
Description : Find the reflection coefficient of the wave with SWR of 3.5. a) 0.55 b) 0.23 c) 0.48 d) 0.68
Last Answer : a) 0.55
Description : Given that the reflection coefficient is 0.6. Find the SWR. a) 2 b) 4 c) 6 d) 8
Last Answer : b) 4
Description : Themaindisadvantage ofthe two-hole directional coupleris a. low directional coupling b. poor directivity c. high SWR d.narrowbandwidth
Last Answer : d.narrowbandwidth
Description : A load of 200 ohm is used to match 300 ohm transmission line to achieve SWR=1. Find out the required characteristic impedance of a quarter of a quarter wave transformer connected directly to the load.
Last Answer : Solution :