National Elevator Industry Educational Program 600 Final Review
-20 mv - ansRefer to figure 3. For the inverting op amp shown, what is the output voltage?
0.3 - ansThe voltage required to cause conduction across the junction in a germanium diode is?
0.3 seconds - ansWhat is the time constant for a circuit with 150 K ohms and 2 microfarad capacitor? (TC = R x
C)
1.5 seconds - ansHow long will it take for this capacitor to be considered fully charged?
1000 0011 - ansWhat is the binary equivalent of 131 10?
12.5 A - ansA 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?
1507 ohms - ansA 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:
169.7 VAC - ansWhat is the peak value of an AC voltage whose RMS value is 120 volts?
190 VDC - ansWhat is the correct average output voltage for a full-wave bridge rectified using silicon diodes
with a peak input supply voltage of 300 VAC
2-50uf/300VDC capacitors in parallel - ansWhat combination of capacitors could be used to replace a
100uf/250 VDC capacitor?
2.4 A - ansThe secondary load current of a 2300 to 120 volt transformer is 46 amperes. What is the current
primary? (E = I x R)
, 30 rpm - ansAn 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?
350uf/150VDC - ansWhat is the total capacitance and the maximum applied voltage for the circuit in figure 8?
3k ohms - ansA 1.5 volt 8 milliamp light emitting diode needs to be operated from a 24VDC circuit. What series
resistance is required?
4 - ansHow many rectifier diodes are required to make a full wave bridge rectifier?
4.61 henries - ansIf a circuit has three inductors in parallel of 10, 15, and 20 henries, what is the total
inductance?
4400 pounds - ansThe 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?
4v - ansRefer 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
5 seconds - ansWhat 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)
5AD - ansWhat is the hexadecimal equivalent of 0101 1010 1101 2
A .7V drop from base-to-emitter is an indication of a good junction - ansWhich of the following statements is
correct when testing transistors?
A high (1) on input A and B - ansRefer to figure 9. What inputs are necessary to get a high (1) on the output?
-20 mv - ansRefer to figure 3. For the inverting op amp shown, what is the output voltage?
0.3 - ansThe voltage required to cause conduction across the junction in a germanium diode is?
0.3 seconds - ansWhat is the time constant for a circuit with 150 K ohms and 2 microfarad capacitor? (TC = R x
C)
1.5 seconds - ansHow long will it take for this capacitor to be considered fully charged?
1000 0011 - ansWhat is the binary equivalent of 131 10?
12.5 A - ansA 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?
1507 ohms - ansA 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:
169.7 VAC - ansWhat is the peak value of an AC voltage whose RMS value is 120 volts?
190 VDC - ansWhat is the correct average output voltage for a full-wave bridge rectified using silicon diodes
with a peak input supply voltage of 300 VAC
2-50uf/300VDC capacitors in parallel - ansWhat combination of capacitors could be used to replace a
100uf/250 VDC capacitor?
2.4 A - ansThe secondary load current of a 2300 to 120 volt transformer is 46 amperes. What is the current
primary? (E = I x R)
, 30 rpm - ansAn 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?
350uf/150VDC - ansWhat is the total capacitance and the maximum applied voltage for the circuit in figure 8?
3k ohms - ansA 1.5 volt 8 milliamp light emitting diode needs to be operated from a 24VDC circuit. What series
resistance is required?
4 - ansHow many rectifier diodes are required to make a full wave bridge rectifier?
4.61 henries - ansIf a circuit has three inductors in parallel of 10, 15, and 20 henries, what is the total
inductance?
4400 pounds - ansThe 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?
4v - ansRefer 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
5 seconds - ansWhat 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)
5AD - ansWhat is the hexadecimal equivalent of 0101 1010 1101 2
A .7V drop from base-to-emitter is an indication of a good junction - ansWhich of the following statements is
correct when testing transistors?
A high (1) on input A and B - ansRefer to figure 9. What inputs are necessary to get a high (1) on the output?
