Chapter 21 Electrical Test and Measurement Equipment 419 14. What advantages does a clamp-on ammeter have compared to a DMM? 15. True or False? A megohmmeter uses low voltage to make resistance measurements. 16. If you need to measure the inductance of a motor, which test instrument could you use? 17. What does the oscilloscope depict on the X axis, and what does it depict on the Y axis? 18. Briefl y describe which two controls on the oscilloscope you would use to set the X and Y values. 19. What is triggering? 20. Th e X10 position allows the oscilloscope probe to present a high impedance and not load the circuit under test. What would you need to do when interpreting the measurement? 21. If you need to simulate a signal while bench testing an assembly, which test instrument would you most likely use? 22. If you want to measure the voltage of a three-phase transformer, which test instrument would you use and how would you connect it? 23. An infrared (IR) thermometer is a noncontact electronic device that measures _____ emitted from a surface or object to determine its temperature. 24. True or False? Test or measurement equipment that is not identical to the calibration standard does not necessarily need to be recalibrated, but rather it must be documented and acknowledged. NIMS CREDENTIALING PREPARATION QUESTIONS Th e following questions will help you prepare for the NIMS Industrial Technology Maintenance Level 1 Electrical Systems credentialing exam. 1. Which of the following ratings identifi es a test equipment’s tolerance for voltage spikes and transients? A. Current rating B. CAT level C. RMS voltage D. PPE rating 2. A receptacle tester can determine: A. If a receptacle is grounded properly B. Th e amount of voltage available from a receptacle C. Th e current rating of a receptacle D. If a receptacle is weatherproof 3. A Hall eff ect sensor is likely to be found in: A. An oscilloscope B. Calibration certifi cates C. Noncontact test equipment D. Motor windings 4. Th e auto-ranging feature on a DMM may eliminate: A. Th e need to use test leads B. Th e need to recharge the DMM battery C. Voltage ratings D. Selection options on the mode selector switch 5. Convert 4600 pF to nanofarads. A. 0.046 nF B. 4.6 nF C. 4600 nF D. 4600000 nF 6. Which of the following is the correct abbreviation for microfarad? A. mF B. miF C. μF D. MF 7. A clamp-on ammeter provides a noncontact method for measuring what quantity? A. AC current B. Resistance C. Capacitance D. Voltage 8. Which of the following devices is also referred to as an insulation tester? A. Clamp-on ammeter B. DMM C. Megohmmeter D. VOM Copyright Goodheart-Willcox Co., Inc.