Description : When you are using an ohmmeter to test a transistor for leakage, what is indicated by a low, but not shorted, reverse resistance reading?
Last Answer : A leaking transistor
Description : When you are testing the gain of an audio-frequency transistor with an ohmmeter, what is indicated by a 10-to-1 resistance ratio?
Last Answer : Normal gain.
Description : You have just checked a 1/500-ampere fuse with an ohmmeter and find it is open. Checking the replacement fuse shows the replacement fuse is open also. Why would the replacement fuse indicate open?
Last Answer : The ohmmeter causes more than 1/500 ampere through the fuse when you check the fuse, thus it opens the fuse.
Description : Which of the following conditions indicates a short circuited capacitor when checking its condition with an ohmmeter? A. The capacitor shows charging, but the final resistance reading is appreciably less ... moves quickly to the low resistance side of the scale, then slowly recedes toward infinity.
Last Answer : Answer: B
Description : Prior to substituting a diode, what measurements should you take to determine its condition?
Last Answer : Voltages and resistances.
Description : When troubleshooting motor controllers, a shorted relay or contactor coil is often indicated by _______________. A. a resistance reading of 'infinity' on an ohmmeter B. charred insulation and/or a blown ... of the coil's leads to ground D. a higher-than-normal voltage reading across the winding
Description : When testing a capacitor with an analog type ohmmeter, a good capacitor will be indicated when _____________. A. there is no meter deflection B. the meter deflects to a low resistance value and ... deflects to a low resistance value and increases rapidly to a higher value, but stays fairly low
Last Answer : Answer: C
Description : When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is ?
Last Answer : When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is all right.
Description : An ohmmeter used to test for front-to-back resistance of a PN junction diode should produce roughly what ratio? A. 100:01:00 B. 500:01:00 C. 1000:01:00 D. 5000:01:00
Last Answer : Answer: A
Description : When using an ohmmeter to test a semiconductor diode, you find a low resistance in both the forward and reverse bias directions. This indicates that the diode has a/an ____________. A. open B. short C. good resistive quality D. good capacitive quality
Description : When making voltage measurements in a high-resistance circuit, you should always use a voltmeter with what relative value of resistance?
Last Answer : . High.
Description : The R x 100 resistance selection on an ohmmeter has what amount of resistance compared to the R x 10 selection?
Last Answer : 1/10.
Description : . A full-scale deflection on an ohmmeter scale indicates what resistance between the leads?
Last Answer : Zero.
Description : A full-scale deflection on an ohmmeter scale indicates what resistance between the leads?
Description : While testing a semi-conductor diode with an ohmmeter, both the forward and reverse readings are almost in the infinity range. This would indicate that the unit is _____________. A. good B. open C. grounded D. shorted
Description : What is the typical back-to-forward resistance ratio of a good-quality diode?
Last Answer : 10-to-1 ratio.
Description : As a rule of thumb, what is an acceptable ratio of back-to forward resistance for a diode?
Last Answer : Greater than 10 to 1
Description : What are two transistor tests that can be done with an ohmmeter?
Last Answer : Gain and junction resistance.
Description : When testing an SCR with an ohmmeter, the SCR will conduct if what two elements are shorted together?
Last Answer : Gate and anode.
Description : What must be done to a circuit before you can use an ohmmeter for testing?
Last Answer : It must be de-energized.
Description : When you are using an ohmmeter to test a transistor, what range settings should be avoided?
Last Answer : Any range setting that produces a current flow through the transistor that exceeds 1 milliamp (usually R x 1 range)
Description : Before you connect a VOM in a circuit for an ohmmeter reading, in what condition must the circuit be?
Last Answer : De-energized
Description : How could you check a 1/500-ampere fuse with an ohmmeter?
Last Answer : Use a resistor in series with the fuse when you check it with the ohmmeter.
Description : You have just checked a fuse with an ohmmeter and find that the fuse is shorted. What should you
Last Answer : Put it back in the circuit. A good fuse will have zero ohms of resistance.
Description : What area of an ohmmeter scale should be used when measuring circuits?
Last Answer : The middle of the scale.
Description : What is used to provide the ohmmeter with several ranges?
Last Answer : An ohmmeter has several internal range resistors and a switch or a series of jacks to select the proper range.
Description : How is a series-type ohmmeter connected to the circuit being measured?
Last Answer : The ohmmeter is connected in series with the resistance to be measured.
Description : What other measurement can an ohmmeter make?
Last Answer : Circuit continuity.
Description : What electrical quantity is measured by an ohmmeter?
Last Answer : Resistance.
Description : A capacitor can be tested using a megohmmeter or an ohmmeter. If the meter is connected to a shorted capacitor, the meter pointer should _____________. A. immediately swing to the maximum resistance ... deflect to and remain at zero D. immediately swing to a high reading and then gradually decrease
Description : Desirable resistance of a ________ is achieved by connecting a high resistance Rh in series with a galvanometer a) Ammeter b) Ohmmeter c) LED d) Voltmeter
Last Answer : d) Voltmeter
Description : Which of the devices listed is indicated by the electronic symbol lettered as 'A', shown in the illustration? EL-0016 A. Thyristor B. Diode C. Capacitor D. Transistor
Description : What two properties of the launch condition may affect multimode fiber attenuation measurements?
Last Answer : . Launch spot size and angular distribution.
Description : Radar surface-angular measurements are referenced to true north and measured in what plane?
Last Answer : Horizontal plane.
Description : What are the three units of measure most commonly used when referring to af power measurements?
Last Answer : DB, dBm, and vu.
Description : Kelvin bridges are well suited for what type of measurements?
Last Answer : Small values of resistances
Description : How does the supply voltage affect the accuracy of Wheatstone bridge measurements?
Last Answer : As the supply voltage increases, bridge components may heat up and become less accurate.
Description : When you are measuring a component using a bridge, what is the most common cause of inaccurate measurements?
Last Answer : The capacitive and inductive characteristics of the test leads.
Description : Power measurements performed with calorimeters are based on what three variables?
Last Answer : Temperature, mass, and time.
Description : For power measurements, what advantage does an electronic wattmeter have over an electrodynamic wattmeter?
Last Answer : Electronic wattmeters are capable of measuring high-fequency signals.
Description : When is an optical power meter measurement recommended for conducting field measurements on installed optical fiber cables or cable plants?
Last Answer : When an installed optical fiber cable or cable plant is less than 50 meters in length.
Description : Why is a dead-zone fiber placed between the test fiber and OTDR when conducting attenuation measurements?
Last Answer : To reduce the effect of the initial reflection at the OTDR
Description : Why do end users perform fiber geometry measurements in the laboratory?
Last Answer : To reduce system attenuation and coupling loss resulting from poor fiber fabrication.
Description : List the fiber geometrical measurements performed in the laboratory.
Last Answer : Cladding diameter, core diameter, numerical aperture, and mode field diameter.
Description : What are the advantages of connecting ammeters in parallel when performing current measurements?
Last Answer : Decreased internal meter resistance, greater accuracy, and greater current range.
Description : The frequency response of test equipment refers to what aspect of ac voltage measurements?
Last Answer : the range of frequencies that can accurately be measured.
Description : When troubleshooting electronic equipment, you should use a high impedance multimeter ________________. A. to prevent excess current flow through the meter that would damage it B. for AC measurements only ... being tested D. so as not to load down the circuit and obtain erroneous voltage readings
Last Answer : Answer: D
Description : What limits the usefulness of high-gain, tunnel-diode frequency converters?
Last Answer : Stability problems.
Description : Conductor resistance may be INDIRECTLY measured by using a/an _____________. A. voltmeter only B. ammeter only C. voltmeter and an ammeter D. ohmmeter only