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600 Final Review Neiep Assessment Test
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 R 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?
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?
It is nearly equal to the emitter current
Which of the following is correct about collector current of a transistor?
4400 pounds
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
What is the most important property an inductor possesses?
Placing two capacitors in series decreases the capacitance.
Which statement is correct regarding capacitors?
Dielectric
Which of the following factors determines the voltage rating of a capacitor?
A resistor is placed in series with the capacitor
What is usually done to protect large capacitors during charging?
Excessive current in the coil circuit
An MOV placed around a relay coil for voltage spike suppression has shorted. What would the effects be?
They may be polarity sensitive
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
Refer to figure 7. What inputs are necessary to get a low (0) on the output?
To help drain voltage when power is removed
Why are bleeder resistors sometimes connected across high voltage capacitors?
350uf/150VDC
What is the total capacitance and the maximum applied voltage for the circuit in figure 8?
Ripple voltage
What is the AC component of a DC power supply output called?
169.7 VAC
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
Which of the following statements is correct as to why DC power supply series regulators are better than shunt regulators?
What is the binary equivalent of 131 10?
5AD
What is the hexadecimal equivalent of 0101 1010 1101 2
190 VDC
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
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
How can pitting due to arching be reduced on relay contact surfaces?
Capacitor voltage is minimum and current is maximum
Which of the following statements is correct when DC is first applied in an RC circuit?
Voltage spikes
In elevator systems, what do noise suppression capacitors help reduce?
2 - 50uf/300VDC capacitors in parallel
What combination of capacitors could be used to replace a 100uf/250 VDC capacitor?
The base-emitter junction must be forward biased
For a NPN transistor to be properly biased, which of the following must be true?
When current is changing rapidly
When is CEMF greatest for an inductor is an AC circuit?
The anode is 0.7 volts higher than the cathode
