Description : What controls the contrast of a television cathode ray picture? A. AFC B. video stage gain C. Audio gain control D. CRT bias
Last Answer : B. video stage gain
Description : The ___________ of a CRO controls the brightness of the spot formed on the screen a) Filament b) Grid c) Deflection plates d) Cathode
Last Answer : b) Grid
Description : In an oscilloscope, ___ adjusts the brightness of the spot by chaning the current on the control grid.
Last Answer : intensity control
Description : Which of the following refers to the video signal amplitude that determines the quality of the picture? A. Chrominance B. Luminance C. Brightness D. Contrast
Last Answer : D. Contrast
Description : What consists the front-end circuit of a VHF TV superheterodyne receiver? A. Mixer, RF amplifier and AFC? B. RF amplifier, Band pass filter and mixer C. Local oscillator, mixer and RF amplifier D. Local oscillator, AGC and antenna
Last Answer : C. Local oscillator, mixer and RF amplifier
Description : Refers to one of the front end circuit of a VHF TV superheterodyne receiver which is usually a separate circuit coupled to the mixer. A. Antenna feed B. AGC C. RF amplifier D. Local oscillator
Last Answer : D. Local oscillator
Description : What part or section of a TV receiver that separates the sound and video signals? A. IF stage B. Video amplifier C. Video detector D. Burst separator
Last Answer : C. Video detector
Description : What is the basic technique used to stabilize a satellite? A. Gravity-forward motion balance B. Spin C. Thruster control D. Solar panel orientation 62. The jet thrusters are usually
Last Answer : B. Spin
Description : What are the three elements of a bipolar transistor? Are they the: w) grid, plate, cathode x) suppressor, deflector, target y) energizer, controller, terminus z) emitter, base, collector
Last Answer : ANSWER: Z -- EMITTER, BASE, COLLECTOR
Description : Which of the following is not a baseband signal modulation? A. RF carrier B. Video System C. Audio signal D. Binary coded pulses
Last Answer : A. RF carrier
Description : Which of the following monitor types most closely resembles a television: a) flat panel b) cathode ray tube c) e - book reader d) data projector e) None of The Above
Last Answer : b) cathode ray tube
Description : The input signal of a travelling wave tube is introduced at A. Cathode B. Anode C. Cathode end of the helix D. Collector end of the helix
Last Answer : C. Cathode end of the helix
Description : What absorber in which efficient absorption is only possible over a very narrow band approaching 1.0 (total absorption)? A. Porous material B. Helmholtz resonator C. Panel Absorber D. Membrane absorber
Last Answer : B. Helmholtz resonator
Description : What kind of battery panels are used in some advance satellites? A. Gallium Arsenide solar panel B. Germanium based panels C. Silicon based panels D. Gallium Phosphate solar panel
Last Answer : A. Gallium Arsenide solar panel
Description : Which of the following is/are true concerning electric power operated watertight door systems? A. Each motor driven door must use the main bus as its source of power. B. Each distribution panel for ... to permit quick activation of the system. D. Each system must have a separate branch circuit.
Last Answer : Answer: D
Description : The ___ provides the visual display showing the form of the signal applied as a waveform on the front screen of a cathode ray oscilloscope
Last Answer : CRT
Description : How can I adjust brightness on my USB Video Device?
Last Answer : The video device should have some software to allow configuration of brightness and contrast I would hope. Can you provide a device model and type to help a bit more?
Description : The purpose of the 'heater resistors' for the winch circuit shown in the illustration is to _______________. EL-0102 A. limit the current in the heater circuit B. dispel moisture in the ' ... panel C. keep the winch brake housing below the dew point D. maintain winch motor operating temperature
Last Answer : Answer: B
Description : The circuit illustrated represents a single phase AC ground detecting system. If a ground occurs on line 'B', which of the lamps will burn the brightest? EL-0008 A. X B. Y C. Both will be equal brightness. D. both will go out.
Last Answer : Answer: A
Description : The circuit illustrated represents a 2 wire DC ground detecting system. If the positive bus is grounded and the test button is pushed, which of the lamps will be brightest? EL-0008 A. X B. Y C. both will be equal brightness. D. both will go out.
Last Answer : Answer: C
Description : Which standard is utilized in intermodulation noise rates on PCM audio channels? A. CCIT Rec. G.151 B. CCIT Rec. G.172 C. CCIT Rec. G.190 D. CCIT Rec. G.190
Last Answer : B. CCIT Rec. G.172
Description : A form of regenerative repeater for transmitting signals over a long cable received through a relay in a clearer form. A. Active generator B. Active repeater C. Interpolator D. Audio generator
Last Answer : C. Interpolator
Description : A test method of comparing two audio systems by switching inputs so that the same recording is heard in rapid succession over one given system and then the other. A. B test B. A test C. AB test D. C test
Last Answer : C. AB test
Description : What is the standard test tone used for audio measurements? A. 100 Hz B. 500 Hz C. 1000 Hz D. 2000 Hz
Last Answer : C. 1000 Hz
Description : A 1 Mhz carrier is amplitude modulated by a pure 200-Hz audio test tone. Which of the following combinations of frequencies represent the total content of the AM signal? A. 1 MHz and 200 Hz B. 1 MHz and 1000.2 kHz C. 999.8 kHz, 1000 kHz, and 1000.2 kHz D. 999.8 kHz and 1000.2 kHz
Last Answer : C. 999.8 kHz, 1000 kHz, and 1000.2 kHz
Description : What is meant by the term modulation index? A. The processor index. B. The ratio between the deviation of a frequency modulated signal and the modulating frequency. C. The FM signal-to-noise ratio. D. The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency.
Last Answer : B. The ratio between the deviation of a frequency modulated signal and the modulating frequency.
Description : 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 ... . D. The ratio of the highest audio modulating frequency to the average audio modulating frequency.
Last Answer : B. The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency.
Description : What is meant by the term deviation ratio? A. The ratio of the carrier center frequency to the audio modulating frequency B. The ratio of the highest audio modulating frequency to the ... audio modulation frequency D. The ratio of the audio modulating frequency to the center carrier frequency
Last Answer : C. The ratio of the maximum carrier frequency deviation to the highest audio modulation frequency
Description : ________ is the method of encoding audio signals used in US standard 1544 kbit/s 24 channel PCM systems. A. Shannon’s law B. A-law C. Newton’s law D. Mu-law
Last Answer : D. Mu-law
Description : How can receiver desensitizing be reduced? A. Increase the receiver bandwidth B. Ensure good RF shielding between the transmitter and receiver C. Increase the transmitter audio gain D. Decrease the receiver squelch, gain.
Last Answer : D. Decrease the receiver squelch, gain.
Description : An instrument for recording waveforms of audio frequency. A. Oscilloscope B. Phonoscope C. Radioscope D. Audioscope
Last Answer : B. Phonoscope
Description : What is the effect in over modulated amplitude modulated radio broadcasting transmission? A. Interference to adjacent channel B. Higher fidelity C. Increase noise D. Higher audio signal
Last Answer : A. Interference to adjacent channel
Description : Atmospheric noise is less at severe frequencies above A. Audio level B. 30 MHz C. 10 GHz D. 1 GHz
Last Answer : B. 30 MHz
Description : ______ used to measure speech volume A. Volume meter B. Audio frequency meter C. Volume unit meter D. Speech meter
Last Answer : C. Volume unit meter
Description : The ratio of the level of the modulated output of a transmitter under conditions of standard test modulation to the level of the demodulated output with no modulation applied both measured with the ... . Reference audio output B. None of these C. Audio frequency response D. Residual noise level
Last Answer : D. Residual noise level
Description : What is the difference between phase and frequency modulation? A. Is purely theoretical because they are the same in practice B. Lies in poorer audio response of phase modulation C. Lies in the different definitions of the modulation index D. Is too great to make two systems compatible
Last Answer : C. Lies in the different definitions of the modulation index
Description : Three audio waves with 100,200 and 300 volts amplitude respectively, simultaneously modulate a 450 volts carrier. What is the total percent of modulation of the AM wave? A. 69 % B. 115.5 % C. 50% D. 83%
Last Answer : D. 83%
Description : ECE Board Exam March 1996 According to the Nyquist theorem, the sampling rate that can be used in a PCM system is ________ the highest audio frequency. A. once B. eight times C. twice D. thrice
Last Answer : C. twice
Description : What is audio amplifier?
Last Answer : The amplifier receives an input from signal source or from a transducer and gives out an amplified signal to the output device is called an audio amplifier.
Description : Mention any two audio frequency oscillators .
Last Answer : i. RC phase shift oscillator ii. Wein bridge oscillator
Description : Which of the following is not a common application of fiber-optic cable? a. Computer networks b. Long-distance telephone systems c. Closed circuit TV d. Consumer TV
Last Answer : d. Consumer TV
Description : A voltmeter located on a control panel has been operating correctly for six months, suddenly burns out. After removing it, it is found that neither side of the meter has been grounded. When ... side and the ground C. installed exactly as the old installation D. grounded to the positive side
Description : How do you hang a wreath on a glass panel front door?
Last Answer : I have a plastic thing that hangs from over the top of the door, most discount stores have them in their Christmas decoration sections.
Description : there are 3 light bulbs in three seperate rooms. in front of you, there is a panel with 3 seperate switches. they only turn on or off. you may look inside each room only once. how can you tell which bulb belongs to which switch? -Riddles
Last Answer : you turn on any two switches, leave them for a few minutes, and turn one off. you enter each room only once. you know that the lightbulb that is lit beongs to the switch that was left on, the ... hot, belongs to the switch you turned off, and the cold bulb belongs to the switch you never touched.
Description : The front panel display provides lights as green LED represent sand red LED represent _ for device programmer who writes input/output basic: a. Busy and Error b. Error and Busy c. Busy and Busy d. Error and Error
Last Answer : a. Busy and Error
Description : List four controls on front panel of dual trace CRO.
Last Answer : (i)X-shift on CRO: Controls the horizontal position of the display i.e moves the spot across the screen left and right. ii) CT MODE Button on CRO: To test different components iii) Symmetry knob on ... Button on CRO: In DUAL, operates as a DUAL trace scope in ALT or CHOP mode as selected.
Description : List any four measure knobs on front panel on CRO.
Last Answer : Knobs on front panel of CRO: 1. Power ON- OFF 2. Intensity control 3. Focus control 4. Astigmatism control 5. Volt/Div control 6. Vertical position control 7. Invert 8. Horizontal position control 9. Synchronization. 10. Channel selection.
Description : Will audio video cables connect my DVD to my TV?
Last Answer : When you purchase a DVD player, cables for audio as well as video is also included. All you have to do is connect the audio and video cables to your television and your ready to go.
Description : As shown in the illustrations, most console schematic diagram sheets have letters and/or numbers placed across the top and numbers along the side boarders. The purpose of these markings is to ... small hole over a letter and number, what month and year that particular page was redrawn
Description : Critical section for shear in case of flat slabs is at a distance of (A) Effective depth of slab from periphery of column/drop panel (B) d/2 from periphery of column/capital/ drop panel (C) At the drop panel of slab (D) At the periphery of column
Last Answer : Answer: Option B