Description : When no signal is being received, the loudspeaker is not entirely silent as a result of the presence of A. parasitic oscillations in some of the receiver stages. B. negative feedback in each stage. C. spurious frequencies as a result of improper neutralization. D. internal receiver noise.
Last Answer : D. internal receiver noise.
Description : Which frequency reuse method is less effective because of Faraday’s effect? A. Dual polarization B. Reducing antenna beamwidth C. Zonal rotation D. Spin stabilization
Last Answer : A. Dual polarization
Description : What is the term used in telephony and telegraphy for irregular disturbing radiation due to various causes and in a particular produced by arc transmitters causing a rushing sound in receiving telephones? A. Fax tone B. Mush C. Hiss D. Crosstalk
Last Answer : B. Mush
Description : Why are frequency modulation transmitters more efficient? A. Because their power is increased by class C amplifiers B. Because their power is increased by class A amplifiers C. Because their power is increased by class B amplifiers D. Because their power is increased by class AB amplifiers
Last Answer : A. Because their power is increased by class C amplifiers
Description : In satellite communications, what means of attitude control is using the angular momentum of the spinning body to provide the roll and yaw stabilization? A. Spin stabilization B. Radial stabilization C. Three-axis stabilization D. Station keeping
Last Answer : A. Spin stabilization
Description : When measuring a transmitter’s frequency against a suitable standard, the frequency to be measured is taken from the A. oscillator stage B. intermediate amplifier C. buffer stage D. final RF stage
Last Answer : D. final RF stage
Description : Which of the following satellite subsystem provides stabilization in orbit and senses changes in orientation? A. Attitude control subsystem B. TTC C. AKM D. Transponder
Last Answer : A. Attitude control subsystem
Description : How can intermodulation interference between two transmitters in close proximity reduced or eliminated? A. Through installing a band-pass filter in the antenna feed line B. Through installing terminated circulator ... high driving power D. By installing a low-pass filter in the antenna feed line
Last Answer : A. Through installing a band-pass filter in the antenna feed line
Description : What would happen if you plugged an FM transmitter into a radio's headphone jack and set the radio to the transmitter's transmitting frequency?
Last Answer : You would get a positive feedback loop, probably resulting in an audible tone. The amplitude would be limited by the transmitter’s modulation limiter, so all you’d have is a very ordinary oscillator.
Description : Do they make replacement radio control transmitters?
Last Answer : Radioshack will have a large selection of radio control transmitters. Online stores have a greater selection for the type of radio control transmitters for the selected radio transmitters your using.
Description : What device measures the angle between two radio frequencies and also the direction of propagation of a wave? A. Densimeter B. Absorption wavemeter C. Goniometer D. Ergometer
Last Answer : C. Goniometer
Description : Impressed current cathodic protection is used on vessels instead of _________________. A. fire alarm systems B. repeated painting C. sacrificial zincs D. vacuum tube degaussing systems
Last Answer : Answer: C
Description : For more complete vessel protection when using an impressed current cathodic system _____________. A. all ship's service alternators have additional temperature sensing devices and a thermal recorder ... with the hull and the propeller shaft is grounded through a slip ring/brush arrangement
Last Answer : Answer: D
Description : (i)What happens to the internal energy of the system. (a) if work is done by the system. (b)Work is done on the system. (ii) Why enthalpy of neutralization of strong acid and base is consant?
Last Answer : Ans. (i).(a)ΔU Decreases. (ΔU = q - w) (b)ΔU increases. (ΔU = q + w) (ii) Strong acids and bases dissociate completely into ions in aqueous solution and form 1 mole of water.
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 : Considered as the main source of an internal noise. A. Device imperfection B. Thermal agitation C. Temperature change D. Flicker
Last Answer : B. Thermal agitation
Description : Mechanism or device which enables the TV camera to move in internal and tilting motion. A. Tilting B. Scanner C. Pan/tilt device D. Panning device
Last Answer : C. Pan/tilt device
Description : If the length of a Hertz dipole is decreased A. its resonant frequency will be lowered its distributed inductance will be increased B. its distributed inductance will be decreased C. its ... frequency will be increased D. its distributed capacitance between the antenna and ground will be increased.
Last Answer : C. its resonant frequency will be increased
Description : If an antenna is too short for the wavelength being used, the effective length can be increased by adding: A. capacitance in series B. inductance in series C. resistance in parallel D. resistance in series
Last Answer : B. inductance in series
Description : Top loading is used in an antenna in order to increase its ______. A. practical height B. beamwidth C. effective height D. input capacitance
Last Answer : C. effective height
Description : A transmitted signal 5 meters in wavelength is received by an antenna coil having a 50-Ω resistance and a 0.01 H inductance. What is the capacitance of the tuner shunting the antenna coil at this point? A. 0.704 fF B. 0.704 μF C. 0.704 nF D. 0.704 mF
Last Answer : A. 0.704 fF
Description : What is the propagation velocity of a signal in a transmission line whose inductance and capacitance are 5μH/m and 20μF/m respectively? A. 100x103 m/s B. 100 m/s C. 10x103 m/s D. 100x106 m/s
Last Answer : A. 100x103 m/s
Description : What is the velocity factor of coaxial cable with a characteristic impedance of 50Ω and capacitance of 30pF/ft and inductance of 75 nH/ft? A. 0.58 B.0.68 C. 0.98 D. 0.81
Last Answer : B.0.68
Description : Which of the following determines the characteristics of a transmission line? A. Inductance B. Capacitance C. Physical dimension D. Length
Last Answer : C. Physical dimension
Description : Referred to the dielectric constant of a transmission line material. A. Inductance and capacitance B. Velocity factor C. Characteristic impedance D. Propagation velocity
Last Answer : B. Velocity factor
Description : Top loading is used in an antenna in order to increase its ___________. A. input capacitance B. beamwidth C. bandwidth D. effective height
Last Answer : D. effective height
Description : What is a selective fading effect? A. A fading effect caused by small changes in beam heading at the receiving station. B. A fading effect caused by phase differences between radio wave ... station D. A fading effect caused by time differences between the receiving and transmitting stations.
Last Answer : B. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station.
Description : The bending of radio waves passing over the top of a mountain range that disperses a weak portion of the signal behind the mountain is A. eddy-current phase effect B. knife-edge diffraction C. shadowing D. mirror refraction effect
Last Answer : B. knife-edge diffraction
Description : In radio High frequency communications the higher the radio frequency the ______. A. Higher it can reach B. Shorter it can reach C. Effect is null D. Longer it can reach
Last Answer : D. Longer it can reach
Description : Refers to an effect of selective fading. A. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station. B. A fading ... caused by large changes in the height of the ionosphere, as experienced at the receiving station.
Last Answer : A. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station.
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 : Aryl halides are less reactive towards nucleophilic substitution as compared to alkyl halides due to (a) Inductive effect (b) Resonance stabilization (c) Tautomerism (d) Stereoisomerism
Last Answer : Resonance stabilization
Description : Most internal noise comes from A. Shot noise B. Transit-time noise C. Thermal agitation D. Skin effect
Last Answer : C. Thermal agitation
Description : _______ is the process in which acids and bases react to form salts and water. (1) Neutralization (2) Electrolysis (3) Distillation (4) Hydrolysis
Last Answer : (1) Neutralization Explanation: Neutralization is a process when acids and bases react to form salt and water.
Description : 0.257g of organic substance was heated with conc. sulphuric acid and then distilled with excess of strong alkali .the ammonia gas evolved was absorbed in 50ml of .1M HCl which required 23.2ml of c for neutralization at the end of the process. Determine the % of nitrogen in the compound ?
Last Answer : A. Vol of 0 .1M HCl taken = 50ml Vol of .1MNaOH used for neutralization of unused acid=23.2ml Now, 23.2 ml of .1MNaOH =23.2ml of .1MHCl Vol of .1MHCl unused=23.2ml Vol of .1MHCl required ... NH3 solution contain nitrogen = 14*26.8/10*1000 Percentage of Nitrogen=14*26.8*100/10*1000*.257 =14.6%
Description : What is the process by which an atom gains electrons? w) Reduction x) Neutralization y) Electrolysis z) Oxidation
Last Answer : ANSWER: W -- REDUCTION
Description : Is Trump a total jerk for cancelling the invitation to the Eagles to visit the White House?
Last Answer : Really, yeah, he is. It's a slap in the face to the players that wanted to come, and deserved to. More importantly, he probably just lost their votes and support. I think they should be able ... goes. Protest or not, enjoy visiting the White House even if they're not fans, whatever they want.
Description : What are your favorite over the ear noise cancelling headphones?
Last Answer : Rarebear Sennheiser. My apology. These I have are headphones, not noise canceling.
Description : Is there such a thing as a noise cancelling stereo?
Last Answer : answer:Active noise canceling is really directional, so you need to know where the sound is coming from and where you want the dead space. You can set up a car for instance with a dead space for the stereo ... 't make it so I can't hear them, but it does make it much easier to concentrate through.
Description : Will voluntarily cancelling a credit card adversely affect my credit rating?
Last Answer : I have been told it is a negative on your credit report but I had a couple on my report I had canceled and had no trouble arranging a home loan (a legit home loan through a local bank).
Description : I want to buy new noise cancelling headphones. Which one should I get?
Last Answer : answer:I suggest Bose products. They are pricey, but I call them kid cancelling' because for the duration of time I wear them I forget I have children. Of course there are dangers associated with not ... any father who has daughters. When there is a 12 year old emotional meltdown I run for them!!
Description : Does cancelling a credit card hurt your credit?
Last Answer : I don't believe cancelling will negatively impact your credit if your balance is 0 and you always paid on time. Always good to keep one credit card active for emergency expenses, though and to use ... said that, it's hard to know what banks and credit card companies are reporting these days.)
Description : Can a dental or medical office charge you for cancelling an appointment?
Last Answer : My Dentist does, but it is only £15.
Description : How do noise cancelling headphones work and to what extent?
Last Answer : There are technically two types of noise canceling headphones. The first are pretty normal, simply insulating your ear to the point of isolation. The second type is more advanced; they put out ambient and ... I think there is a good chance that you couldn't hear a thing with the second type.
Description : If a stranger tried to make an unauthorized purchase with my credit card number, what else should i do besides cancelling the card?
Last Answer : Here is the government’s web site about protecting yourself against identity theft.
Description : Cancelling my Verizon DSL Service...
Last Answer : I have Verizon DSL, and I don’t experience that trouble. In the past, I actually did experience a similar problem. I called and they sent a technician out the next day. He fixed the problem and there hasn’t been an issue since. I would be patient.
Description : Anyone else mad that the CW is cancelling The Game and Everybody Hates Chris (the black shows) but bringing The Vamapire Diaries and Melrose Place?
Last Answer : No, but the Ice Road Truckers Mash-up on the History Channel makes my heart skip a beat…
Description : What's a good set of noise cancelling headphones?
Last Answer : I love my sennheiser PXC250's -- great quality, foldable, lightweight, still work without batteries: http://www.sennheiserusa.com/newsite/productdetail.asp?transid=004924
Description : Ms. Pari, a beginner in SQL is not able to understand the meaning of “Cancelling a Transaction”. Help her in understanding the same. -Technology
Last Answer : Cancelling a transaction means rolls the transaction to the beginning. It aborts any changes made during the transaction and the state of database is returned to what it was before the transaction began to execute.Rollback command is used for the same.
Description : Is a noise cancelling headset worth the money?
Last Answer : If it really bothers you when you are playing games to hear noises outside the game, you play games often and you have the money to spend, then yes, a noise canceling headset is probably worth the money.