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116 Cards in this Set
- Front
- Back
What system is currently used by US military services to identify electronic equipment with standardized nomenclature?
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Joint Electronic Type Designation (JETDS)
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Which of the following categories of test equipment is designed to test, without modification, a range of electronic parameteres neede for two or more systems that are different in design?
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GPETE
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For what purpose was the ETE classification board established?
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To control the increase of nonstandard GPETE
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Which system provides an inventory of test equipment actually located in the fleet?
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SCLSIS
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You can determine if a piece of test equipment has been calibrated by checking which document?
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a tag or label attached to the instrument
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What label is used to identify a test instrument that is within tolerance on all parameters?
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CALIBRATED
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Under what circumstances should the USER CALIBRATION label be affixed to a piece of test equipment?
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When user calibration is required before, during, or after use.
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Which of the following statements must appear on the CALIBRATION NOT REQUIRED label affixed to an instrument?
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By what authority the label was affixed
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Which of the following labels is attached to an unusable instrument, and may have an additional tag attached?
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REJECTED
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A test instrument that has plug-in modules and/or easily accessible potentiometer or controls which affect the calibration of the instrument should have which label attatched?
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CALIBRATION VOID IF SEAL BROKEN
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When maintenance personnel are not authorized to make repairs to a piece of test equipment, what items, if any, must be sent to the calibration repair facility with the equipment?
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All the accessories
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In what type of environment should test equipment be stowed?
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Dry
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In a stowage space aboard ship, what devices should be used to hold the test equipment in place?
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Stretch seat-belt-type straps
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What stystem is used to provide for a standardized recall and scheduling of test equipment into calibration facilities?
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MEASURE
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Which of the following actions would be classified as preventative maintenance?
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Purchasing a new piece of test equipment
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Which of the following actions would be regarded as part of corrective maintenance?
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Alignment of a servo assembly after a repair
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The initial operating conditions of newly installed equipment are referred to as
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Baseline Operating Characteristics
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When working on energized equipment, you should follow which of the following practices?
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Insulate yourself from ground
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When measuring 300 volts or more, you should first take what step?
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Turn off equipment power
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Prior to working on a circuit, you use a shorting probe to discharge which of the following types of components?
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Capacitors and cathode-ray tubes
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If a 28 Volt 6 ampere fuse blows, the proper procedure is to replace it with which of the following devices?
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A fuse of the same voltage and current rating
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After work on equipment is complete, who shoudl remove any attached tags?
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The person who signed the attached the tag
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What is the purpose of the grounding cable attached to the frame of a generator aboard ship?
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Ensure equipment is at same ground potential as the ship
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Which of the following steps should you take to help ensure that metal-case test equipments are safe to use?
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Insulate the metal case from ground
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This measurement is rarely taken in preventitive or corrective maintenance or testing because unsoldering is usually required. Ohm's law is normally applied to determine this value
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Current
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This is a valuable aid in locating faults during corrective maintenance, but cannot be made with power applied. Many technical manuals contain charts that indicate the test points ofr this measurement.
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Resistance
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This measurement provides an indication of dielectric strength and is used to determine the power factor.
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Capacitance
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This measurement is seldom taken during troubleshooting. It can be taken using a bridge or another instrument that is primarily designed to measure another quantity; however, a conversion chart is required.
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Inductance
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The Wheatstone bridge can be used for precision measurements of which of the following quantities?
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Resistance
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DC power is stated in which of the following units?
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Watts
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The bel is a unit of measurement used with voltage, current, or power that compares which of the following circuit values?
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The input to the output
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What is the relationship between the values of the bel and the decibel?
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The decibel is 1/10 the bel
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A thermocouple ammeter is used to measure which of the following quantities?
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RF current
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To measure shaft rotation rate on an engine, you should use, which if any, of the following instruments?
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A Tachometer
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In the centrifugal tachometer, what compenent restricts the action on the lower collar that is produced by centrifugal force?
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The pointer
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What is the usual speed range (in feet per minute) of a chronometric tachometer?
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0-3000
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The flashing rate of a strobatac is controlled by which of the the following circuits?
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An electronic pulse generator
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The flashing rate of the strobotron tube affects its life expectancy. What is the range in hours of life expectancy of the strobotron tube?
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100-250
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When using the vibrating-reed frequency meter, you take the reading in which of the following ways?
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Read the reed that vibrates the most
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For which of the following purposes is a cathode-ray oscilloscope used?
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To visually analyze waveforms
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An oscilloscope measures voltage and displays waveforms. It can be used to measure currents, temperatures, speeds, and accelerations if they are first converted to to _______.
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Voltages
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When troubleshooting transistorized circuits, you should first check the condition of which of the following circuits?
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Power supplies
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Which of the following instruments is used to check transistors for collector leakage current and current gain?
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Semiconductor test set
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When making base-to-emitter bias voltage checks on a transistor, you should read which of the following voltage ranges?
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5-20 microvolts
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When making resistance measurements on a transistor with an ohmeter, you should allow what maximum current in the transistor?
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Milliampere
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What are the two basic components of a galvanometer?
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A stationary permanent magnet and a movable coil
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The phosphor bronze ribbon in the galvanometer serves teh same purpose as what component in the D'Arsonval meter?
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Hairspring
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The direction in which the D'Arsonval meter pointer deflects depends on what characteristic of the current applied to the coil?
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Amplitude
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The D'Arsonval meter movement is damped to prevent which of the following conditions?
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Oscillating readings
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The weight of the rotating coil assembly and the type of bearings used in the D'Arsonval meter are factors that affect which of the following characteristics of the meter?
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The sensitivity
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For a meter to read linearly, its face is divided into equal segments. What meter feature makes this possible?
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The curved poles of the permanent magnet
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What is the purpose of a shunt in a dc ammeter?
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To increase the current range of the meter
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Meter sensitivity is determined by the amount of current required by the ammeter coil to provide full-scale deflection of the pointer. An ammeter coil requiring which of the following current values provides the greatest sensitivity?
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500 microamperes
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In a voltmeter, the D'Arsonval metere movement is caused to move by what electrical action?
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Current
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In a voltmeter, the meter scale is calibrated in which of the following categories?
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Voltage
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To figure the total value of series resistance needed to extend the range of a voltmeter, you need to know the value of current to cause full-scale deflection of the meter and what other value?
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Maximum applied current
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Your voltmeter has four ranges: 1V, 10V, 100V, and 1,000V. To measure an unkown voltage in an amplifier, you should first select what range?
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1000V
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Whicyh of the following types of circuits are most affected by the loading effect of voltmeters?
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High-resistance
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A voltmeter with a 10-microampere meter movement has a sensitivity of how many maximum ohms per volt?
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1000
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A megger is widely used for which of the following purposes?
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To measure insulation resistance
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Before you can take an accurate resistance measurement with an ohmmeter, what meter adjustement must you complete?
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Zero resistance
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Which of the following locations on the meter scale provides the most accurate reading for resistance?
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Near the center of the scale
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An ordinary ohmmeter is unsuitable for measuring insulation resistance for which of the following reasons?
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Insulation resistance values are too great for an ohmmeter to measure
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A megger uses high voltage to check the insulation leakage in the megohm range. What is the source of this voltage?
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A hand-driven dc generator
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Meggers with which of the following maximum voltage ratings are commonly found in the fleet?
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500 volts
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A megger is prevented from exceeding its rated output voltage by which of the following actions?
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friction clutch slippage
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The galvanometer-type meter movement differes from the electrodyamometer meter movement in that the electrodyammoter type uses which of the following components to produce the magnetic field?
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Two sets of coils
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A continuity test is performed on a piece of elctronic equipment to discover what kind of fault?
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Open circuits
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Which of the following meters is recommended for circuit continuity tests?
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An ohmmeter
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When preparing to use an ohmmeter to test a circuit for grounds, you should first take which of the following actions?
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Disconnect all intentional grounds
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It is important to set a voltmeter on its highest range scale before taking a measurement for which of the following reasons?
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To protect the meter from damage
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In what arrangement is an ammeter connected to a circuit?
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In series
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When you are measuring voltage using a voltmeter, where should you stand to view the meter reading?
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Directly infront of the meter
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On an ohmmeter, which of the following switches allows selection of ac or dc readings?
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FUNCTION
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The power required to operate a basic ohmmeter comes from whcih of the following sources?
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Batteries
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The function of the ZERO OHM control on a multimeter is to compensate for which of the following conditions?
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Meter battery aging
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When measuring unkown currents, you should determine the range scale that is appropriate in what way?
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Start with the highest scale and work down
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Digital multimeters can be divided into three functional sections:
1.) signal conditioning 2.) analog-to-digital and what is the 3) section? |
Display
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In a differential voltmeter, an adjustable reference voltage can be produced in increments as small as how many microvolts?
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10
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Which of the following transistor parameters are measured with the transistor tester?
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Collector leakage and current gain
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When you are disconnecting a transistor from the transistor tester, in what position should the POLARITY switch be placed?
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PNP
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When you are testing a transistor with a transistor tester, for the reading to have +/- 15 percent accuracy, the resistance from emitter to base must be what minimum value?
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300 ohms
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When you are testing an in-circuit diode with the transistor tester, the meter pointer deflects below the midscale point. What does this indicate?
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The diode is faulty
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The RCL bridge measures an unkown resistance by balancing the resistance value of the unkown component with that of known components inside the test set. What type of circuit is used in this method of measurement?
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Wheatstone Bridge
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To make an inductance measurement on the model 350DE, you must first adjust the DET GAIN control to what position?
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2
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When you are selecting forward or reverse power measurements, what components of the rf wattmeter are restricted to a 180 degree rotation range?
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The coupler-dector
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Of the follwoing available rf wattmeter power ranges, which one should you select when measuring an unkown power?
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1000 watts
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To take power readings, you connect an in-line rf power meter in what configuration in the transmission line?
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Series
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Which of the following test instruments produces a standard of measurement of ac energy for testing electronics equipment?
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Signal Generator
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Signal generators are equipped with attenuators for which of the following purposes?
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To regulate the output signal level
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Which of the following signal generators should you select to test audio equipment?
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AF Signal Generator
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The output level meter of a signal generator reads 0.10 with the attenuator set to 080. What is the actual output in microvolts?
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0.800
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Frequency counters serve which of the following purposes?
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Measure frequencies in a circuit
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In logic probes, which of the following devices are used as an indicator?
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an LED
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The VERT control adjustment controls what position of the signal on the CRT display?
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Vertical
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The axes of the CRT display on the Tracker 2000 are divided into what number of quadrants?
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4
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Quadrant 2 of the Tracker 2000 CRT is used to display what signal information?
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Negative voltage and positive current.
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What is the principal use of the oscilloscope?
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To visually examine waveforms
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In a basic oscilloscope, what is the purpose of the deflection system?
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To position the beam on the screen
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In oscilloscopes using electrostatic CRTs, what type of signal is used to produce horizontal beam movement?
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Sawtooth Wave
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The length of time the phoshpor coating on the CRT remains bright after the electron beam is removed depends on which of the following characteristics?
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Persistence of the coating
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An oscilloscope that can display two vertical input signals at teh same time is said to be what type?
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Dual-Trace
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The FOCUS control on the front of an oscilloscope is used to adjust what characteristic on the CRT display?
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Beam size
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What control on the front panel of an oscilloscope limits the input signal amplitude and allows the oscilloscope to be used with a wide range of signals?
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ATTENUATOR
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What is the purpose of a variable potentiometer mounted on the VOLTS/DIV control of an oscilloscope?
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To provide definite step control of the input signal
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The time base of an oscilloscope is variable to enable the instrument to
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operate over a wide range of input frequencies
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The triggered oscilloscope has which of the following advanctages over a basic oscilloscope?
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Improved presentation stability
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The TRIGGER and LEVEL controls are used to sycnchronize the sweep generator with what signal?
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Input
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The setting of what control establishes the amplitude point of the input waveform at which the displayed sweep will begin?
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TRIGGER LEVEL
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Which of the following electrical quantities can be measured using an oscilloscope?
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Frequency
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What two modes are used to obtain the dual trace on an oscilloscope?
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Chop and alternate
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In a dual-trace oscilloscope, the gate that controls both sweeps is controlled by a multivibrator that operates at which of the following maximum frequencies?
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1200 kHz
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What is the basic internal configuration of the typical dual-trace oscilloscope?
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One gun assembly with two vertical channels
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The horizontal sweep channels of the dual-trace oscilloscopes have which of the following time base circuit configurations?
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Variations of all the above configurations
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On the spectrum analyzer, the RF input jack is used to accept what maximum frequency input signals?
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21 GHz or below
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The POSITION control on the spectrum analyzer is used to adjust which of the following CRT display features?
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Vertical and Horizontal position
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