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600 FINAL REVIEW NEIEP UPDATED EXAM WITH VERIFIED SOLUTIONS.
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Zener current will decrease - correct answer- Refer to figure 1. If the load resistance R2 is reduced by half what happens what happens to zener diode? 4v - correct answer- 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 - correct answer- 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 - correct answer- 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?
Saturation - correct answer- 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 - correct answer- Which of the following describes how an SCR is turned OFF? Top right - correct answer- On the fourteen pin DIP IC shown in figure 4 what is the location of pin 14 1507 ohms - correct answer- 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 - correct answer- The photodiode will conduct current when it detects A relay timer - correct answer- What does the circuit in figure 5 represent?
It is nearly equal to the emitter current - correct answer- Which of the following is correct about collector current of a transistor? 4400 pounds - correct answer- The entire cab assembly, including the car sling, cab doors, operator, etc., weighs 3400 lbs. The capacity of the elevator is 2500 lbs. The car must be counterweighted at 40% of capacity plus the weight of the car assembly. What is the weight of the counterweight assembly? The ability to resist changes in current flow - correct answer- What is the most important property an inductor possesses? Placing two capacitors in series decreases the capacitance. - correct answer- Which statement is correct regarding capacitors? Dielectric - correct answer- Which of the following factors determines the voltage rating of a capacitor? A resistor is placed in series with the capacitor - correct answer- What is usually done to protect large capacitors during charging?
Excessive current in the coil circuit - correct answer- An MOV placed around a relay coil for voltage spike suppression has shorted. What would the effects be? They may be polarity sensitive - correct answer- Which of the following do you need to be aware of when using electrolytic capacitors? A low (0) on input A and a high (1) on input B - correct answer- Refer to figure 7. What inputs are necessary to get a low (0) on the output? To help drain voltage when power is removed - correct answer- Why are bleeder resistors sometimes connected across high voltage capacitors? 350uf/150VDC - correct answer- What is the total capacitance and the maximum applied voltage for the circuit in figure 8? Ripple voltage - correct answer- What is the AC component of a DC power supply output called?
169.7 VAC - correct answer- What is the peak value of an AC voltage whose RMS value is 120 volts? They operate more accurately over a greater current and voltage range - correct answer- Which of the following statements is correct as to why DC power supply series regulators are better than shunt regulators? 1000 0011 - correct answer- What is the binary equivalent of 131 10? 5AD - correct answer- What is the hexadecimal equivalent of 0101 1010 1101 2 190 VDC - correct answer- What is the correct average output voltage for a full-wave bridge rectified using silicon diodes with a peak input supply voltage of 300 VAC 2.4 A - correct answer- The secondary load current of a 2300 to 120 volt transformer is 46 amperes. What is the current primary? (E = I x R)
Placing a capacitor and resistor in parallel with the load - correct answer- How can pitting due to arching be reduced on relay contact surfaces? Capacitor voltage is minimum and current is maximum - correct answer- Which of the following statements is correct when DC is first applied in an RC circuit? Voltage spikes - correct answer- In elevator systems, what do noise suppression capacitors help reduce? 2 - 50uf/300VDC capacitors in parallel - correct answer- What combination of capacitors could be used to replace a 100uf/ VDC capacitor? The base-emitter junction must be forward biased - correct answer- For a NPN transistor to be properly biased, which of the following must be true? When current is changing rapidly - correct answer- When is CEMF greatest for an inductor is an AC circuit?