Description : What problem is caused in an rf amplifier by a loosely coupled transformer?
Last Answer : A too-narrow bandpass.
Description : Name the three power losses in a transformer
Last Answer : Copper-loss, eddy-current loss, and hysteresis loss
Description : Does 1:5 indicate a step-up or step-down transformer?
Last Answer : Step up.
Description : What effect does flux leakage in a transformer have on the coefficient of coupling (K) in the transformer?
Last Answer : it causes K to be less than unity (I).
Description : The leads to the primary and the high-voltage secondary windings of a power transformer usually are of what color?
Last Answer : Primary leads-black; secondary leads red.
Description : What causes a voltage to be developed across the secondary winding of a transformer?
Last Answer : The magnetic lines generated by the current in the primary cut
Description : What is meant by "exciting current" in a transformer?
Last Answer : Exciting current is the current that flows in the primary of a transformer with the secondary open (no load attached).
Last Answer : Step up
Description : What is meant is "transformer action"?
Last Answer : The transfer of energy from one circuit to another circuit by electromagnetic induction.
Description : What is the main reason for grounding the return side of the transformer to the chassis?
Last Answer : To eliminate shock hazard.
Description : In addition to stepping up or stepping down the input line voltage, what additional purpose does the transformer serve?
Last Answer : . It isolates the chassis from the power line.
Last Answer : Reduce the cost of manufacturing equipment.
Description : For what is the center tap on a transformer used?
Last Answer : Provides capability of developing two high-voltage outputs
Description : For what are the low voltage windings in a transformer used?
Last Answer : Filament voltage to the electron tubes.
Description : What are the purposes of the transformer in a power supply?
Last Answer : It couples the power supply to the ac line voltage, isolates the ac line voltage from the load, and steps this voltage up or down to the desired level.
Description : What type of feedback is usually caused by the base-to collector interelectrode capacitance?
Last Answer : Degenerative or negative
Description : What type of feedback is usually caused by interelectrode capacitance?
Last Answer : Negative (degenerative) feedback
Description : How do we refer to errors caused by faulty logic and coding mistakes?
Last Answer : Bugs.
Description : Losses caused by skin effect and the I2R (power) loss are classified as what type of loss?
Last Answer : Copper losses.
Description : How does index matching gel affect the amount of coupling loss caused by (a) fiber separation, (b) lateral misalignment, and (c) angular misalignment?
Last Answer : (a) Reduces coupling loss, (b) does not change coupling loss, and (c) increases coupling loss
Description : How is board damage caused by technicians?
Last Answer : Repairs by untrained personnel and technicians using improper tools.
Description : What undesirable effect is caused by the inductance of the cathode lead?
Last Answer : Degenerative feedback.
Description : Microbend loss is caused by microscopic bends of the fiber axis. List three sources of microbend loss.
Last Answer : Uneven coating applications, improper cabling procedures, and external force.
Description : Scattering losses are caused by the interaction of light with density fluctuations within a fiber. What are the two scattering mechanisms called when the size of the density fluctuations is (a) greater than and (b) less than one-tenth of the operating wavelength?
Last Answer : . (a) Mie scattering; (b) Rayleigh scattering.
Description : How is this problem corrected?
Last Answer : By using an optimumly-coupled transformer.
Description : What is the most likely problem if the transmitter shaft reads 0º when the receiver shaft indicates 180º?
Last Answer : The rotor leads on either the transmitter or the receiver are reversed.
Description : In the subtract mode, which portion of the problem is complemented?
Last Answer : Subtrahend.
Description : What type of flowchart is constructed by the programmer to represent the sequence of operations the computer is to perform to solve a specific problem?
Last Answer : A programming flowchart.
Description : In programming, how many steps are involved in solving a problem on a computer?
Last Answer : Four.
Description : How is the applications software compatibility problem overcome
Last Answer : Some software comes in several versions so it can run under several different operating systems.
Description : Why is detector saturation not generally a problem in fiber optic communications systems?
Last Answer : Because fiber optic communications systems operate at low optical power levels.
Description : How did vacuum tubes cause a problem for first generation computers
Last Answer : They were unreliable, required a lot of power to run, and produced so much heat that air conditioning was needed to protect computer parts.
Description : Rather than using a stored program, a special-purpose computer's applicability to a particular problem is a function of what?
Last Answer : Its design
Description : A computer that is designed to perform a specific operation and usually satisfies the needs of a particular type of problem, is said to be what type of computer?
Last Answer : Special-purpose.
Description : Flat panel displays are designed to reduce what problem of a crt display?
Last Answer : Reduce the depth of the crt display caused by the length of the tube.
Description : What type of mathematical problem is solved by resolvers?
Last Answer : Right-triangle, or trigonometric, problems.