200 Copyright Goodheart-Willcox Co., Inc. ____________ 10. What does the prefix µ represent? A. 1000 B. 0.001 C. 0.000001 D. 0.000000001 ____________ 11. What is term used when a digital ohmmeter measures a resistance greater than its limit? A. Infinity. B. O.L—over the limit, overload, over range. C. Ohmmed out. D. Over capacity. ____________ 12. What protects a meter when measuring voltage? A. High value series resistance. B. Shunts in parallel. C. Capacitors in parallel. D. Capacitor in series. ____________ 13. What is the typical resistance value that a continuity test buzzer stops sounding? A. 200–300 Ω B. 100–200 Ω C. 400–500 Ω D. 40–60 Ω ____________ 14. True or False? Test leads should be tested frequently. ____________ 15. True power is measured by _____. A. inductive clamp current multiplied by the voltage B. inductive clamp current plus the voltage across the load C. wattmeters D. load resistance times load voltage ____________ 16. Th e megohmmeter is used to measure _____. A. continuity B. phantom voltages C. insulation D. resistance under 1 Ω ____________ 17. True or False? Resolution refers to the smallest increment that can be measured. ____________ 18. What is the range of values that a 6000 count display can show? A. 1 to 6000 B. 0.001 to 5999 C. 0.1 to 5999 D. 0.01 to 6000 ____________ 19. True or False? Temperature and humidity do not aff ect a meter’s accuracy. ____________ 20 True or False? Dual-display meters allow the user to check voltage and resistance at the same time. Critical Thinking 1. If a voltage is measured across an open switch in a live circuit and the load has an equivalent resistance to the meter’s internal resistance, what voltage would the meter display? ______________________________________________________________________________________________________________ ______________________________________________________________________________________________________________ ______________________________________________________________________________________________________________ 2. Why does a megohmmeter require high voltage to detect insulation failure? ______________________________________________________________________________________________________________ ______________________________________________________________________________________________________________ ______________________________________________________________________________________________________________