600 Final Review Neiep Questions and Answers

Zener current will decrease - Refer to figure 1. If the load resistance R2 is reduced by half what happens what happens to zener diode? 4v - Refer to figure 1. The zener diode is designed to breakdown at 6VDC what is the voltage drop across R1 with a constant DC supply of 10VDC 30 rpm - An elevators motor rotates at 1200 rpm at contract speed and is geard at a ratio of 40:1. If the motor turns 40 rpm the sheave turns 1 rpm. What is the actual speed of the drive sheave in rpms? The output will go to zero - Refer to figure 2. For the comparator circuit shown, what will happen to the output of the non-inverting input goes more positive than the inverting input? -20 mv - Refer to figure 3. For the inverting op amp shown, what is the output voltage? Saturation - Which term defines the limit of magnetic strength around an inductor even though the current through the coil increases Voltage is removed from anode to cathode - Which of the following describes how an SCR is turned OFF? Top right - On the fourteen pin DIP IC shown in figure 4 what is the location of pin 14 1507 ohms - A brake coil has an inductance of 4 henries. If the coil was placed into a circuit with an operating frequency of 60hz the coil would have a resistance of: light - The photodiode will conduct current when it detects A relay timer - What does the circuit in figure 5 represent?12.5 A - A string of temporary lighting has fifteen 100 watt bulbs. A 15 amp breaker is the maximum size that can be used with the 14 gauge wire used in this 120 volt circuit. What is the current? 4.61 henries - If a circuit has three inductors in parallel of 10, 15, and 20 henries, what is the total inductance? LED - What does the symbol in figure 6 represent? A .7V drop from base-to-emitter is an indication of a good junction - Which of the following statements is correct when testing transistors? An SCR - What does the symbol shown below represent?