600 Final Review Neiep6
Zener current will decrease - ANSWERS-Refer to figure 1. If the load resistance R2 is reduced by
half what happens what happens to zener diode?
4v - ANSWERS-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 - ANSWERS-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 - ANSWERS-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 - ANSWERS-Refer to figure 3. For the inverting op amp shown, what is the output
voltage?
Saturation - ANSWERS-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 - ANSWERS-Which of the following describes how an
SCR is turned OFF?
Top right - ANSWERS-On the fourteen pin DIP IC shown in figure 4 what is the location of pin 14
, 1507 ohms - ANSWERS-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 - ANSWERS-The photodiode will conduct current when it detects
A relay timer - ANSWERS-What does the circuit in figure 5 represent?
12.5 A - ANSWERS-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 - ANSWERS-If a circuit has three inductors in parallel of 10, 15, and 20 henries,
what is the total inductance?
LED - ANSWERS-What does the symbol in figure 6 represent?
A .7V drop from base-to-emitter is an indication of a good junction - ANSWERS-Which of the
following statements is correct when testing transistors?
An SCR - ANSWERS-What does the symbol shown below represent?
5 seconds - ANSWERS-What is the length of time required to charge a 500-microfarad capacitor
in series with a 10K ohm resistor to the maximum applied voltage of 125 VDC? (TC = R x C)
It is nearly equal to the emitter current - ANSWERS-Which of the following is correct about
collector current of a transistor?
4400 pounds - ANSWERS-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
Zener current will decrease - ANSWERS-Refer to figure 1. If the load resistance R2 is reduced by
half what happens what happens to zener diode?
4v - ANSWERS-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 - ANSWERS-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 - ANSWERS-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 - ANSWERS-Refer to figure 3. For the inverting op amp shown, what is the output
voltage?
Saturation - ANSWERS-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 - ANSWERS-Which of the following describes how an
SCR is turned OFF?
Top right - ANSWERS-On the fourteen pin DIP IC shown in figure 4 what is the location of pin 14
, 1507 ohms - ANSWERS-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 - ANSWERS-The photodiode will conduct current when it detects
A relay timer - ANSWERS-What does the circuit in figure 5 represent?
12.5 A - ANSWERS-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 - ANSWERS-If a circuit has three inductors in parallel of 10, 15, and 20 henries,
what is the total inductance?
LED - ANSWERS-What does the symbol in figure 6 represent?
A .7V drop from base-to-emitter is an indication of a good junction - ANSWERS-Which of the
following statements is correct when testing transistors?
An SCR - ANSWERS-What does the symbol shown below represent?
5 seconds - ANSWERS-What is the length of time required to charge a 500-microfarad capacitor
in series with a 10K ohm resistor to the maximum applied voltage of 125 VDC? (TC = R x C)
It is nearly equal to the emitter current - ANSWERS-Which of the following is correct about
collector current of a transistor?
4400 pounds - ANSWERS-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
