Description : What is the main difference between these two types of variations?
Last Answer : . Regular variations can be predicted but irregular variations are unpredictable
Description : What are the two types of cells?
Last Answer : Primary and secondary.
Description : Which of the two main types of rotors can have either a single winding or three Y-connected windings?
Last Answer : The drum or wound rotor.
Description : List the main types of receiver noise.
Last Answer : Thermal noise, dark current noise, and quantum noise
Description : What is the main difference in construction between normal PN junction diodes and tunnel diodes?
Last Answer : The amount of doping.
Description : What is the main difference in the energy arrangement between an isolated atom and the atom in a solid?
Last Answer : The energy levels of an atom in a solid group together to form
Description : What is the major difference between the electronics dry-air branch and the vital service lp air main?
Last Answer : Degree of dehydration.
Description : What is the main difference between a vu and a dB meter?
Last Answer : DB meters are used for measuring sine waves. Vu meters are used to measure the average value of complex waveforms.
Description : What is the main difference between the Armstrong oscillator and the Hartley oscillator?
Last Answer : Feedback coil. Armstrong uses a separate coil. Hartley uses a tapped coil.
Description : What is the main difference between agc and dagc?
Last Answer : Dagc does not attenuate weak signals.
Description : What is the most obvious difference between the two types of ohmmeters
Last Answer : Series ohmmeters have 0 on the right end of the scale and ¥ on the left end of the scale. Shunt ohmmeters are the opposite.
Description : What are the three ways of combining cells, and what is each used for?
Last Answer : Series, to increase voltage but not current. Parallel, to increase current but not voltage. Series-Parallel, to increase both current and
Description : What three cells use the same electrolyte?
Last Answer : Silver-cadmium, silver-zinc, and nickel-cadmium.
Last Answer : Silver-cadmium, silver-zinc, and nickel-cadmium
Description : What are the two main categories of maintenance?
Last Answer : Preventive and corrective maintenance.
Description : What are the two main disadvantages of an LC capacitor filter?
Last Answer : Cost and size of the inductor.
Description : What are the two main sources of emi with which radio waves must compete?
Last Answer : Natural and man-made interference.
Description : . What are the two main disadvantages of an LC capacitor filter?
Last Answer : Cost of the inductor and size of the inductor.
Description : What two main advantages of a parasitic array can be obtained by combining a reflector and a director with the driven element?
Last Answer : Increased gain and directivity.
Description : What type of junctions are formed where the arms of a hybrid ring meet the main ring?
Last Answer : Basic E-type junctions.
Description : What is the main reason for using a multispeed synchro system instead of a single-speed synchro system?
Last Answer : Greater accuracy without the loss of self-synchronous operation.
Description : What are the three main parts of CRT?
Last Answer : a. Electron gun. b. Deflection system
Description : What is the main disadvantage of parallel transfer?
Last Answer : Requires more circuitry.
Description : What is the main reason for grounding the return side of the transformer to the chassis?
Last Answer : To eliminate shock hazard.
Description : What main advantage does a bridge rectifier have over a conventional full-wave rectifier?
Last Answer : The bridge rectifier can produce twice the voltage with the same size transformer.
Description : What is the main disadvantage of a conventional full-wave rectifier?
Last Answer : Peak voltage is half that of the half-wave rectifier.
Description : What are the four main classes of regular variation which affect the extent of ionization in the ionosphere?
Last Answer : Daily, seasonal, 11-year, and 27-days variation
Description : What three main factors determine the amount of refraction in the ionosphere?
Last Answer : (a) density of ionization of the layer (b) frequency (c) angle at which it enters the layer
Description : What is the main cause of intermodulation distortion?
Last Answer : Close spacing of transmitters and receivers.
Last Answer : Reduce the cost of manufacturing equipment.
Last Answer : The bridge rectifier can produce double the voltage with the same size transformer.
Description : What is the main disadvantage of the conventional full wave rectifier?
Last Answer : The peak voltage is half that of a half-wave rectifier.
Description : What are the main causes of coupling loss?
Last Answer : Poor fiber end preparation and poor fiber alignment.
Description : What is the main factor that determines receiver sensitivity?
Last Answer : Noise
Description : What are four main causes of tape failure?
Last Answer : Normal wear, accidental damage, environmental damage, and winding errors.
Description : The control electronics component of a floppy or hard disk drive performs what three main functions?
Last Answer : a. Spins the disk at the correct speed. b. Moves the heads across the recording surface. c. Tells the write/read heads when to write data and when to read it.
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 : What is the main use of a radio teletypewriter?
Last Answer : High speed automatic communications across ocean areas.
Description : What is the main advantage of radiotelegraph communications?
Last Answer : Reliability.
Description : What is the main disadvantage of PROM?
Last Answer : If a mistake is made and entered, it cannot be corrected or erased.
Description : What is the main loss mechanism between the ultraviolet and infrared absorption regions?
Last Answer : Rayleigh scattering.
Description : What are the main causes of absorption in optical fiber?
Last Answer : Intrinsic and extrinsic material properties.
Description : What is the main advantage of a series motor?
Last Answer : High torque (turning force) at low speed.
Description : What is the main disadvantage of a series motor?
Last Answer : It must have a load connected to avoid damage from excess speed.
Description : What is the main disadvantage of series generators?
Last Answer : Output voltage varies as the load varies
Description : What is the main disadvantage of using fiber-optic cables?
Last Answer : High attenuation.
Description : Name the three main sections of a typical rf signal generator.
Last Answer : Oscillator circuit, modulator, and output control circuit.
Description : What are the five main components of a circuit breaker?
Last Answer : Frame, operating mechanism, arc extinguishers, terminal connectors, and trip element.
Description : What is the main disadvantage of the rhombic antenna?
Last Answer : It requires a large antenna site.
Description : What is the main disadvantage of pulse-position modulation?
Last Answer : It requires synchronization between the transmitter and receiver.