Description : What are the two types of circuit protection devices?
Last Answer : Fuses and circuit breakers
Description : What conditions must be met in order to balance a bridge circuit?
Last Answer : A bridge circuit is balanced when the opposite legs of the comparing and measuring circuits exhibit the same voltage drop.
Description : Under what circuit conditions would the shunt detector be used?
Last Answer : When the input voltage variations are too small to give a usable output from a series detector.
Description : wetlands and estuaries are critical ecosystems, but do not require protection. -General Knowledge
Last Answer : The given statement is false.
Description : Where automatic restart does not present a hazard after a power failure, Coast Guard Regulations (46 CFR) require motor controllers for auxiliaries vital to the propelling equipment to be provided ... overload protection B. low voltage protection C. low voltage release D. reverse current protection
Last Answer : Answer: C
Description : LEDs operating at 850 nm provide sufficient optical power for short-distance, low-bandwidth multimode systems. List three conditions that prevent the use of LEDs in longer distance, higher bandwidth multimode systems.
Last Answer : Multimode fiber dispersion, the relatively high fiber attenuation, and the LED's relatively low optical output power.
Description : What are the two types of metallic protection?
Last Answer : Sheath and armor
Description : What size wire bundles require double lace?
Last Answer : Bundles that are 1 inch or larger in diameter
Description : What type of synchros usually require the use of synchro capacitors?
Last Answer : TDXs, CDXs, and Cts.
Description : What type of electron-resonance anode block does not require strapping?
Last Answer : Rising-sun block.
Description : Cartridge hard disk drives with 14" disk packs may require what additional types of preventive maintenance?
Last Answer : a. Cleaning with a special cleaning disk. b. Cleaning air filters. c. Cleaning spindles, rails, and slides. d. Cleaning and buffing read/write heads.
Description : Why do floppy disk drives require more preventive maintenance than hard disk drives?
Last Answer : They are not sealed units, and they use flimsy plastic disks with an oxide coating that wears off and sticks to the heads
Description : Why do earth terminals require highly sensitive receivers?
Last Answer : To overcome satellite transmitter low power and permit extraction of the desired information from the received signal.
Description : What does the liquid crystal display require for computer applications?
Last Answer : An external light source, called a backlight.
Description : What are the three requirements necessary for oscillations to exist in a circuit?
Last Answer : Amplification, regenerative feedback, and frequency-determining device.
Description : Name the three methods of interconnecting components in multilayer printed circuit boards.
Last Answer : Clearance hole, plated-through hole, and layer build-up
Description : A series circuit consisting of three resistors has a current of 3 amps. If R1 = 20 ohms, R2= 60 ohms, and R 3 = 80 ohms, what is the (a) total resistance and (b) source voltage of the circuit?
Last Answer : (a) 160 ohms. (b) 480 ohms
Description : What are the three time delay ratings for circuit breakers?
Last Answer : Instantaneous, short time delay, and long time delay.
Description : What are the three types of circuit breaker trip elements?
Last Answer : Thermal, magnetic, and thermal-magnetic
Description : What are the three types of circuit control devices?
Last Answer : Switches, solenoids, and relays.
Description : What are three reasons circuit control is needed?
Last Answer : To remove power from a malfunctioning device; to remove power from a device you wish to work on and restore power when the work is completed; to turn devices on and off as the device is needed; to select the function or circuit desired within a device.
Description : The chief advantage of encystment of an Amoeba is (a) the ability to survive during adverse physical conditions (b) the ability to live for sometime without ingesting food (c) protection from parasites and predators (d) the chance to get rid of accumulated waste products
Last Answer : (a) the ability to survive during adverse physical conditions
Description : What conditions require respiratory therapy?
Last Answer : Respiratory therapy is used in the treatment of breathing disorders. Some such disorders include Asthma, COPD, emphysema, and bronchitis.
Description : What medical conditions require the use of monoclonal antibodies?
Last Answer : Monoclonal antibodies work on specific cells. They are used in cancer treatment and in the treatment of autoimmune diseases.
Description : In crop movement programme, haploids are important because they (a) require one half of nutrients (b) are helpful in study of meiosis (c) grow better under adverse conditions (d) form perfect homozygous.
Last Answer : (d) form perfect homozygous.
Description : When a wavefront is radiated into a waveguide, what happens to the portions of the wavefront that do not satisfy the boundary conditions?
Last Answer : Decrease to zero.
Description : For an R-S FF to change output conditions, the inputs must be in what states?
Last Answer : 1 and 0, or opposite states.
Description : All the power sent down a transmission line from a transmitter can be transferred to an antenna under what optimum conditions?
Last Answer : When the characteristic impedance of the transmission line and the load impedance are equal.
Description : A triode amplifier similar to the one shown in figure 1-19 has an Ebb -conditions, 1.5 milliamperes of current conducts through the tube. What w
Last Answer : +275 volts
Description : What capability allows the arithmetic/logic section to test various conditions encountered during processing and take action based on the result?
Last Answer : Logic.
Description : What are the two types of dc operations used to represent mark and space conditions?
Last Answer : Neutral and polar.
Description : Boolean algebra is based on the assumption that most quantities have _______ conditions.
Last Answer : Two.
Description : optical launch conditions exists if the launch spot size and angular distribution are larger than that of the fiber core?
Last Answer : Overfilled.
Description : What term applies to the voltage variation from no-load to full-load conditions and is expressed as a percentage?
Last Answer : Voltage regulation.
Description : What conditions should you check for when conducting preventive maintenance on fuses?
Last Answer : Improper fuse, corrosion, improper fit, and open fuse.
Description : What two conditions are necessary for heterodyning to take place?
Last Answer : At least two different frequencies applied to a nonlinear impedance.
Description : The wiring diagram for the motor starting circuit shown in the illustration indicates ______________. EL-0007 A. resistance starting B. reduced voltage starting C. low voltage protection D. low voltage release
Description : Periodic testing of circuit breakers is necessary to assure that a correctly rated and properly installed unit _________________. A. can trip faster as it increases in age B. will continue to provide ... not exceed its interrupting capacity D. be able to withstand at least 125% of applied voltage
Last Answer : Answer: B
Description : The circuit shown in the illustration represents a ________. EL-0090 A. battery charging circuit B. synchronous exciter C. depth sounding unit D. cathodic protection system
Last Answer : Answer: D
Description : Which of the listed items will stop a motor due to a reduction in voltage and restart it when the voltage is restored to normal? A. Low voltage protection circuit B. Non-renewable link fuse C. Renewable link fuse D. Low voltage release circuit
Description : The purpose of a magnetic relay is to _____________. A. open a circuit only in the event of overload B. remotely open and close contacts C. provide overcurrent protection during starting D. relay voltages at increased power
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
Description : The type of control circuit that will not permit automatic restarting after power is restored, following a power failure is called _____________. A. low voltage protection B. low voltage release C. overload lockout D. reduced voltage restart
Last Answer : Answer: A
Description : Fuses placed in series with a thermal trip-type circuit breaker are used for _____________. A. time-delay protection B. short-circuit protection C. short duration surge protection D. sustained overload protection
Description : The main difference between a motor control circuit containing low voltage protection and low voltage release is that the latter contains _____________. A. a magnetic operating coil B. normally open line contacts C. thermal-overload protection D. a momentary-contact start button
Description : A low-voltage protection circuit is used in electric motor starting equipment to _____________. A. trip circuit contactors when the motor overspeeds due to low voltage B. trip circuit ... voltage without manually resetting D. prevent the motor from restarting automatically on restoration of voltage
Description : Protection against sustained overloads occurring in molded-case circuit breakers is provided by a/an __________. A. overvoltage release B. thermal acting trip C. thermal overload relay D. current overload relay
Description : A molded-case circuit breaker provides protection against short circuits by using a/an ________________. A. electromagnet B. shading coil C. arc quencher D. burn away strip
Description : Which of the following is the least expensive protection for overcurrent is low voltage system ? (a) Rewireable fuse (b) Isolator (c) Oil circuit breaker (d) Air break circuit breaker (e) None of the above
Last Answer : (a) Rewireable fuse
Description : A thermal protection switch can protect against (a) short-circuit (b) temperature (c) overload (d) over voltage
Last Answer : (c) overload