Description : What is a temporary or permanent local deviation of the OTDR signal in the upward or downward direction called?
Last Answer : A point defect.
Description : What does a tone control circuit in a receiver do to the audio signal?
Last Answer : It controls the amount of bass and treble response.
Description : What type of ranging circuit is most often used with a radar that requires extremely accurate range data?
Last Answer : Range gate or range step.
Description : What type of switch is used if it is necessary to guard against a circuit being accidentally turned
Last Answer : A locked-position switch.
Description : The circuit which changes input signal at output with phase shift of 1800 is called (a) Amplifier (b) operational amplifier (c) switch (d) inverter
Last Answer : (d) inverter
Description : What type of magnetic material should be used to make a temporary magnet?
Last Answer : A material that exhibits low reluctance and high permeability, such as iron or soft steel.
Description : In a circuit such as that shown in figure 3-16, if R1 has a value of 50 ohms and R2 has a value of 250 ohms and the input signal has a value of +10 millivolts, what is the value of the output signal?
Last Answer : 60 millivolts.
Description : In a circuit such as that shown in figure 3-15, if R1 has a value of 100 ohms and R2 has a value of 1 kilohm and the input signal is at a value of + 5 millivolts, what is the value of the output signal?
Last Answer : 50 millivolts.
Description : When a circuit uses cathode biasing, the input signal can cause varia
Last Answer : Through the use of a bypass capacitor
Description : If the output of a circuit needs to be a complete representation of one-half of the input signal, what class of operation is indicated?
Last Answer : Class B operation.
Description : If the mu of a tube is 85 and the signal at the control grid is 4 volts ac, the plate voltage will vary by what amount?
Last Answer : 340 volts.
Description : The plate voltage of a tube will vary 126 volts when a 3-volt ac signal is applied to the control grid. What is the gain of this tube?
Last Answer : 42.
Description : An instrument thAn instrumAn instrument that must be calibrated in place requires what type of calibration label?
Last Answer : SPECIAL CALIBRATION label.
Description : What type of data transfer requires the most time?
Last Answer : Serial.
Description : What type of bias requires constant current flow through the cathode
Last Answer : Cathode biasing.
Description : What type of prime mover requires a specially designed high-speed alternator?
Last Answer : Steam turbine.
Description : What type of bias makes a diode act as a closed switch?
Last Answer : Forward bias.
Description : If a switch must be checked with power applied, what type of meter is used?
Last Answer : A voltmeter.
Description : The heaters for the winch circuit shown in the illustration are powered from _____________. EL-0102 A. a separate source B. the winch main bus C. the master switch power circuit D. the contactor control circuit
Last Answer : Answer: A
Description : You are attempting to parallel two AC generators and the synchroscope pointer is revolving slowly in the fast direction. You should _____________. A. use the governor control switch to adjust the incoming ... the 0° position D. use the field rheostat to adjust the speed of the incoming machine
Last Answer : Answer: C
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 : Trade-offs between competing effects are necessary for high speed response. Which competing effect (fast transit time, low capacitance, or high quantum efficiency) requires a thin active area?
Last Answer : Fast transit time.
Description : If the load in question 50 requires a voltage of +90 V, what should be the value of the bleeder resistor?
Last Answer : 2 kΩ
Description : Pulse-code modulation requires the use of approximations of value that are obtained by what process?
Last Answer : Quantization.
Description : What happens if a soldering gun switch is pressed for periods longer than 30 seconds?
Last Answer : It will overheat and could burn the insulation of the wire being soldered.
Description : If the ignition switch is placed in the ON position and all the engine instruments operate properly except the gas gauge, where would the fault probably be?
Last Answer : Between point (3) and the gas gauge tank unit ground.
Description : What device is used to switch power from the normal source to an alternate source for nonvital users?
Last Answer : What device is used to switch power from the normal source to an alternate source for nonvital users?
Description : When cleaning the parts of a tape transport, why should you switch lint-free cloths and swabs often?
Last Answer : You may transfer dirt or oxide particles from one part of the tape transport to another
Description : What two types of meters can be used to check a switch?
Last Answer : An ohmmeter and a voltmeter.
Description : What is the voltage rating of a switch?
Last Answer : The maximum voltage allowable in the circuit in which the switch is installed.
Description : What is the current rating of a switch?
Last Answer : The maximum current a switch is designed to carry.
Description : What is the common name used for an accurate snap acting switch?
Last Answer : A microswitch.
Description : In describing a switch by the number of positions of the actuator, what are the two possible configurations for a single pole, double-throw switch?
Last Answer : Two-position and three-position.
Description : What classification of a switch is used when you describe it as a rocker switch?
Last Answer : The type of actuator.
Description : What is one example of an automatic switch?
Last Answer : A thermostat, an automobile distributor, a limit switch, etc.
Description : What is one example of a manual switch?
Last Answer : A light switch, an ignition switch, television channel selector, etc.
Description : What is the difference between a manual and an automatic switch?
Last Answer : A manual switch must be turned on or off by a person. An automatic switch turns a circuit on or off without the action of a person
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 : Radar altimeters use what type of transmission signal?
Last Answer : Frequency modulated (fm).
Description : What type of feedback aids an input signal?
Last Answer : Regenerative or positive
Description : What type of tape error causes noise to appear on the tape when no signal should appear? What causes this type of tape error?
Last Answer : Noise error is usually caused by a cut or a scratch on the magnetic tape.
Description : What is the most common and most serious type of signal dropout?
Last Answer : Oxide particles that get onto the magnetic tape.
Description : Which type of optical fiber (multimode or single mode) tends to have lower loss and produces less signal distortion?
Last Answer : Single mode fiber.
Description : What type of amplifier would be used to amplify the signal from a radio antenna?
Last Answer : An rf voltage amplifier.
Description : A dipole antenna requires to be fed with 20 kW of power to produce a given signal strength to a particular distant point. If the addition of a reflector makes the same field strength available with an input power of 11kW ... Gain referred to this particular dipole). A. 4.75 B. 2.6 C. 1.81 D. 4.24
Last Answer : B. 2.6
Description : A dipole antenna requires to be feed with 20 kW of power to produce a given signal strength to a particular distant point. If the addition of a reflector makes the same field strength available with an input power of 11 ... ( Gain referred to this particular dipole) A. 4.24 B. 1.81 C. 4.75 D. 2.6
Last Answer : D. 2.6
Description : Suppose a digitized voice channel is made by digitizing 8 kHz bandwidth analog voice signal. It is required to sample the signal at twice the highest frequency (two samples per hertz). What is the bit rate required, if it ... sample requires 8 bits? (A) 32 kbps (B) 64 kbps (C) 128 kbps (D) 256 kbps
Last Answer : (C) 128 kbps
Description : In the system shown in the illustration, the station at section I is unable to signal any other station nor is any other station able to signal the station in section I. The station can, however, ring ... only a single station to respond to itself. D. The switch at component 'C' is stuck open.
Description : In the illustration, the signal from the device connected to terminals 18 and 19 is __________. EL-0046 A. prime mover speed feedback B. loss of control alarm when comparing with the input signal ... slip between the prime mover and the alternator D. to shut down the prime mover if overspeeding