Fill in the Blanks
1. The symbol for a battery consists of two parallel lines, one longer and one ____________.
2. In a series circuit, the current is the ____________ throughout the circuit.
3. The total current in a parallel circuit is the ____________ of the currents through each branch.
4. The resistance of a conductor is directly proportional to its ____________ and inversely proportional to its ____________.
5. The total voltage across all components in a series circuit is equal to the ____________ of individual voltages.
6. The ability of a conductor to oppose current flow is called ____________.
7. In a parallel circuit, the voltage across each component is ____________.
8. A device that converts electrical energy into mechanical energy is a ____________.
9. A device that converts mechanical energy into electrical energy is a ____________.
10. The electrical force that drives current through a circuit is known as ____________.
11. The flow of electric charge is called ____________.
12. The formula to find the total resistance in a parallel circuit is 1/R total = 1/R1 + 1/R2 + _________.
13. An electrical component that opposes changes in voltage is called a ____________.
14. The energy consumed by a circuit is measured in ____________.
15. The rate of flow of electrical charge is called ____________.
True or False
1. The total resistance in a series circuit is equal to the sum of the individual resistances. (True/False)
REFERENCES
1. The symbol for a battery consists of two parallel lines, one longer and one ____________.
2. In a series circuit, the current is the ____________ throughout the circuit.
3. The total current in a parallel circuit is the ____________ of the currents through each branch.
4. The resistance of a conductor is directly proportional to its ____________ and inversely proportional to its ____________.
5. The total voltage across all components in a series circuit is equal to the ____________ of individual voltages.
6. The ability of a conductor to oppose current flow is called ____________.
7. In a parallel circuit, the voltage across each component is ____________.
8. A device that converts electrical energy into mechanical energy is a ____________.
9. A device that converts mechanical energy into electrical energy is a ____________.
10. The electrical force that drives current through a circuit is known as ____________.
11. The flow of electric charge is called ____________.
12. The formula to find the total resistance in a parallel circuit is 1/R total = 1/R1 + 1/R2 + _________.
13. An electrical component that opposes changes in voltage is called a ____________.
14. The energy consumed by a circuit is measured in ____________.
15. The rate of flow of electrical charge is called ____________.
True or False
1. The total resistance in a series circuit is equal to the sum of the individual resistances. (True/False)
2. In a parallel circuit, the current is the same through all components. (True/False)
3. A capacitor stores energy in the form of a magnetic field. (True/False)
4. The unit of electrical power is the Joule. (True/False)
5. The unit of electrical resistance is the Ampere. (True/False)
6. In a series circuit, the voltage is divided among the components, but the current remains the same. (True/False)
7. The total resistance in a parallel circuit is always greater than the smallest resistance. (True/False)
8. The direction of current flow in a circuit is always from positive to negative. (True/False)
9. The unit of inductance is the Farad. (True/False)
10. A fuse is a safety device that melts when excessive current flows through it, breaking the circuit. (True/False)
Knowledge Application Questions
1. What happens to the current in a DC circuit if the voltage is increased but the resistance remains the same?
2. What are three types of DC circuits, with regard to the placement of the various circuit components?
3. How many cells are there in a 24-volt lead-acid battery?
4. What is the specific gravity of the electrolyte in a fully charged lead-acid battery?
5. What is the range of temperatures of the electrolyte in a lead-acid battery that does not require that you apply a correction when measuring its specific gravity?
6. What instrument is used to measure the specific gravity of the electrolyte in a lead-acid battery?
7. How is a lead-acid battery compartment treated to protect it from corrosion?
8. What is used to neutralize spilled electrolyte from a lead-acid battery?
9. How high should the electrolyte level be in a properly serviced lead-acid battery?
10. What precautions should be taken in a maintenance shop where both lead-acid and nickel-cadmium batteries?
11. Why is a hydrometer not used to measure the state of charge of a nickel-cadmium battery?
12. What is used to neutralize spilled electrolyte from a nickel-cadmium battery?
13. What is meant by electromagnetic induction?
14. How many ohms are in a megohm?
15. What part of an amp is a milliamp?
3. Which of these will cause the resistance of a conductor to decrease?
a. Decrease the length or the cross-sectional area.
b. Decrease the length or increase the cross-sectional area.
c. Increase the length or decrease the cross-sectional area.
4. Through which material will magnetic lines of force pass the most readily?
a. Copper.
b. Iron.
c. Aluminum.
5. A 48-volt source is required to furnish 192 watts to a parallel circuit consisting of three resistors of equal value. What is the value of each resistor?
a. 36 ohms.
b. 4 ohms.
c. 12 ohms.
6. Which is correct concerning a parallel circuit?
a. Total resistance will be smaller than the smallest resistor.
b. Total resistance will decrease when one of the resistances is removed.
c. Total voltage drop is the same as the total resistance.
7. The voltage drop in a circuit of known resistance is dependent on
a. the voltage of the circuit.
b. only the resistance of the conductor and does not change with a change in either voltage or amperage.
c. the amperage of the circuit.
8. A thermal switch, or thermal protector, as used in an electric motor, is designed to
a. close the integral fan circuit to allow cooling of the motor.
b. open the circuit in order to allow cooling of the motor.
10. (Refer to Figure 2.) The No. 7 wire is used to
a. close the PUSH-TO-TEST circuit.
b. open the UP indicator light circuit when the landing gear is retracted.
c. close the UP indicator light circuit when the landing gear is retracted.
13. (Refer to Figure 3.) The TCO relay will operate if 24-volts DC is applied to the bus and the fuel tank selector is in the
a. right-hand tank position.
b. crossfeed position.
c. left-hand tank position.
14. (Refer to Figure 3.) With power to the bus and the fuel selector switched to the right-hand tank, how many relays in the system are operating?
a. Three.
b. Two.
c. Four.
15. (Refer to Figure 3.) When electrical power is applied to the bus, which relays are energized?
a. PCC and TCC.
b. TCC and TCO.
c. PCO and PCC.
16. (Refer to Figure 3.) Energize the circuit with the fuel tank selector switch selected to the left-hand position. Using the schematic, identify the switches that will change position.
a. 5, 9, 10, 11, 12, 13, 15.
b. 3, 5, 6, 7, 11, 13.
18. (Refer to Figure 4.) The electrical symbol represented at number 5 is a variable
a. inductor.
b. resistor.
c. capacitor.
19. (Refer to Figure 5.) When the landing gears are up and the throttles are retarded, the warning horn will not sound if an open occurs in wire
a. No. 4.
b. No. 2.
c. No. 9.
20. (Refer to Figure 5.) The control valve switch must be placed in the neutral position when the landing gears are down to
a. permit the test circuit to operate.
b. prevent the warning horn from sounding when the throttles are closed.
c. remove the ground from the green light.
21. (Refer to Figure 6.) Under which condition will a ground be provided for the warning horn through both gear switches when the throttles are closed?
a. Right gear up and left gear down.
b. Both gears up and the control valve out of neutral.
c. Left gear up and right gear down.
22. (Refer to Figure 6.) When the throttles are retarded with only the right gear down, the warning horn will not sound if an open occurs in wire
a. No. 5.
b. No. 13.
c. No. 6.
23. (Refer to Figure 6.) When the landing gears are up and the throttles are retarded, the warning horn will not sound if an open occurs in wire
a. No. 5.
b. No. 7.
c. No. 6.
24. When referring to an electrical circuit diagram, what point is considered to be at zero voltage?
a. The circuit breaker.
b. The switch.
c. The ground reference.
25. What is the purpose of the ground symbol used in electrical circuit diagrams?
a. To show that there is common bus for connection of the source of electrical energy to the load.
b. To show the source of electrical energy for the load.
c. To show that there is a return path for the current between the source of electrical energy and the load.
26. (Refer to Figure 7.) Troubleshooting an open circuit with a voltmeter as shown in this circuit will
a. permit current to flow and illuminate the lamp.
b. create a low resistance path and the current flow will be greater than normal.
c. permit the battery voltage to appear on the voltmeter.
27. (Refer to Figure 8.) Which symbol represents a variable resistor?
a. 2.
b. 1.
c. 3.
28. In a P-N-P transistor application, the solid state device is turned on when the
a. base is negative with respect to the emitter.
b. base is positive with respect to the emitter.
c. emitter is negative with respect to the base.
29. In an N-P-N transistor application, the solid state device is turned on when the
a. emitter is positive with respect to the base.
b. base is negative with respect to the emitter.
c. base is positive with respect to the emitter.
30. Typical application for zener diodes is as
a. full-wave rectifiers.
b. half-wave rectifiers.
c. voltage regulators.
31. (Refer to Figure 9.) Which illustration is correct concerning bias application and current (positive charge) flow?
a. 1.
b. 2.
c. 3.
32. Forward biasing of a solid state device will cause the device to
a. conduct via zener breakdown.
b. conduct.
c. turn off.
33. (Refer to Figure 10.) If an open occurs at R1, the light
a. cannot be turned on.
b. will not be affected.
c. cannot be turned off.
34. (Refer to Figure 10.) If R2 sticks in the up position, the light will
a. be on full bright.
b. be very dim.
c. not illuminate.
35. (Refer to Figure 11.) Which statement concerning the depicted logic gate is true?
a. Any input being 1 will produce a 0 output.
b. Any input being 1 will produce a 1 output.
c. All inputs must be 1 to produce a 1 output.
36. (Refer to Figure 12.) In a functional and operating circuit, the depicted logic gate’s output will be 0
a. only when all inputs are 0.
b. when all inputs are 1.
c. when one or more inputs are 0.
37. (Refer to Figure 13.) Which of the logic gate output conditions is correct with respect to the given inputs?
a. 1.
b. 2.
c. 3.
38. Which of the following logic gates will provide an active high out only when all inputs are different?
a. XNOR.
b. NAND.
c. XOR.
39. A lead-acid battery with 12 cells connected in series (no-load voltage = 2.1 volts per cell) furnishes 10 amperes to a load of 2-ohms resistance. The internal resistance of the battery in this instance is
a. 0.52 ohm.
b. 2.52 ohms.
c. 5.0 ohms.
40. If electrolyte from a lead-acid battery is spilled in the battery compartment, which procedure should be followed?
a. Apply boric acid solution to the affected area followed by a water rinse.
b. Rinse the affected area thoroughly with clean water.
c. Apply sodium bicarbonate solution to the affected area followed by a water rinse.
Knowledge Application Questions
1. What happens to the current in a DC circuit if the voltage is increased but the resistance remains the same?
2. What are three types of DC circuits, with regard to the placement of the various circuit components?
3. How many cells are there in a 24-volt lead-acid battery?
4. What is the specific gravity of the electrolyte in a fully charged lead-acid battery?
5. What is the range of temperatures of the electrolyte in a lead-acid battery that does not require that you apply a correction when measuring its specific gravity?
6. What instrument is used to measure the specific gravity of the electrolyte in a lead-acid battery?
7. How is a lead-acid battery compartment treated to protect it from corrosion?
8. What is used to neutralize spilled electrolyte from a lead-acid battery?
9. How high should the electrolyte level be in a properly serviced lead-acid battery?
10. What precautions should be taken in a maintenance shop where both lead-acid and nickel-cadmium batteries?
11. Why is a hydrometer not used to measure the state of charge of a nickel-cadmium battery?
12. What is used to neutralize spilled electrolyte from a nickel-cadmium battery?
13. What is meant by electromagnetic induction?
14. How many ohms are in a megohm?
15. What part of an amp is a milliamp?
Multiple Choices Questions
1. In a parallel circuit with three 6-ohms resistors across a 12-volt battery, what is the total current (It) value in the circuit?
a. 2 amps.
b. 6 amps.
c. 12 amps.
2. (Refer to Figure 1.) The total resistance of the circuit is
a. 25 ohms.
b. 35 ohms.
1. In a parallel circuit with three 6-ohms resistors across a 12-volt battery, what is the total current (It) value in the circuit?
a. 2 amps.
b. 6 amps.
c. 12 amps.
2. (Refer to Figure 1.) The total resistance of the circuit is
a. 25 ohms.
b. 35 ohms.
c. 17 ohms.
 |
| Figure 1. Circuit Diagram |
3. Which of these will cause the resistance of a conductor to decrease?
a. Decrease the length or the cross-sectional area.
b. Decrease the length or increase the cross-sectional area.
c. Increase the length or decrease the cross-sectional area.
4. Through which material will magnetic lines of force pass the most readily?
a. Copper.
b. Iron.
c. Aluminum.
5. A 48-volt source is required to furnish 192 watts to a parallel circuit consisting of three resistors of equal value. What is the value of each resistor?
a. 36 ohms.
b. 4 ohms.
c. 12 ohms.
6. Which is correct concerning a parallel circuit?
a. Total resistance will be smaller than the smallest resistor.
b. Total resistance will decrease when one of the resistances is removed.
c. Total voltage drop is the same as the total resistance.
7. The voltage drop in a circuit of known resistance is dependent on
a. the voltage of the circuit.
b. only the resistance of the conductor and does not change with a change in either voltage or amperage.
c. the amperage of the circuit.
8. A thermal switch, or thermal protector, as used in an electric motor, is designed to
a. close the integral fan circuit to allow cooling of the motor.
b. open the circuit in order to allow cooling of the motor.
c. reroute the circuit to ground.
9. (Refer to Figure 2.) With the landing gear retracted, the red indicator light will not come on if an open occurs in wire
a. No. 19.
b. No. 7.
c. No. 17.
9. (Refer to Figure 2.) With the landing gear retracted, the red indicator light will not come on if an open occurs in wire
a. No. 19.
b. No. 7.
c. No. 17.
 |
| Figure 2. Landing Gear Circuit |
10. (Refer to Figure 2.) The No. 7 wire is used to
a. close the PUSH-TO-TEST circuit.
b. open the UP indicator light circuit when the landing gear is retracted.
c. close the UP indicator light circuit when the landing gear is retracted.
11. (Refer to Figure 2.) When the landing gear is down, the green light will not come on if an open occurs in wire
a. No. 7.
b. No. 6.
c. No. 17.
a. No. 7.
b. No. 6.
c. No. 17.
12. (Refer to Figure 3.) What will be the effect if the PCO relay fails to operate when the left-hand tank is selected?
a. The fuel pressure crossfeed valve will not open.
b. The fuel tank crossfeed valve open light will illuminate.
a. The fuel pressure crossfeed valve will not open.
b. The fuel tank crossfeed valve open light will illuminate.
c. The fuel pressure crossfeed valve open light will not illuminate.
 |
| Figure 3. Fuel System Circuit |
13. (Refer to Figure 3.) The TCO relay will operate if 24-volts DC is applied to the bus and the fuel tank selector is in the
a. right-hand tank position.
b. crossfeed position.
c. left-hand tank position.
14. (Refer to Figure 3.) With power to the bus and the fuel selector switched to the right-hand tank, how many relays in the system are operating?
a. Three.
b. Two.
c. Four.
15. (Refer to Figure 3.) When electrical power is applied to the bus, which relays are energized?
a. PCC and TCC.
b. TCC and TCO.
c. PCO and PCC.
16. (Refer to Figure 3.) Energize the circuit with the fuel tank selector switch selected to the left-hand position. Using the schematic, identify the switches that will change position.
a. 5, 9, 10, 11, 12, 13, 15.
b. 3, 5, 6, 7, 11, 13.
c. 5, 6, 11, 12, 13, 15, 16.
17. (Refer to Figure 4.) Which of the components is a potentiometer?
a. 5.
b. 3.
c. 11.
17. (Refer to Figure 4.) Which of the components is a potentiometer?
a. 5.
b. 3.
c. 11.
 |
| Figure 4. Electrical Symbols |
18. (Refer to Figure 4.) The electrical symbol represented at number 5 is a variable
a. inductor.
b. resistor.
c. capacitor.
19. (Refer to Figure 5.) When the landing gears are up and the throttles are retarded, the warning horn will not sound if an open occurs in wire
a. No. 4.
b. No. 2.
c. No. 9.
 |
| Figure 5. Landing Gear Circuit |
20. (Refer to Figure 5.) The control valve switch must be placed in the neutral position when the landing gears are down to
a. permit the test circuit to operate.
b. prevent the warning horn from sounding when the throttles are closed.
c. remove the ground from the green light.
21. (Refer to Figure 6.) Under which condition will a ground be provided for the warning horn through both gear switches when the throttles are closed?
a. Right gear up and left gear down.
b. Both gears up and the control valve out of neutral.
c. Left gear up and right gear down.
 |
| Figure 6. Landing Gear Circuit |
22. (Refer to Figure 6.) When the throttles are retarded with only the right gear down, the warning horn will not sound if an open occurs in wire
a. No. 5.
b. No. 13.
c. No. 6.
23. (Refer to Figure 6.) When the landing gears are up and the throttles are retarded, the warning horn will not sound if an open occurs in wire
a. No. 5.
b. No. 7.
c. No. 6.
24. When referring to an electrical circuit diagram, what point is considered to be at zero voltage?
a. The circuit breaker.
b. The switch.
c. The ground reference.
25. What is the purpose of the ground symbol used in electrical circuit diagrams?
a. To show that there is common bus for connection of the source of electrical energy to the load.
b. To show the source of electrical energy for the load.
c. To show that there is a return path for the current between the source of electrical energy and the load.
26. (Refer to Figure 7.) Troubleshooting an open circuit with a voltmeter as shown in this circuit will
a. permit current to flow and illuminate the lamp.
b. create a low resistance path and the current flow will be greater than normal.
c. permit the battery voltage to appear on the voltmeter.
 |
| Figure 7. Circuit Diagram |
27. (Refer to Figure 8.) Which symbol represents a variable resistor?
a. 2.
b. 1.
c. 3.
 |
| Figure 8. Electrical Symbols |
28. In a P-N-P transistor application, the solid state device is turned on when the
a. base is negative with respect to the emitter.
b. base is positive with respect to the emitter.
c. emitter is negative with respect to the base.
29. In an N-P-N transistor application, the solid state device is turned on when the
a. emitter is positive with respect to the base.
b. base is negative with respect to the emitter.
c. base is positive with respect to the emitter.
30. Typical application for zener diodes is as
a. full-wave rectifiers.
b. half-wave rectifiers.
c. voltage regulators.
31. (Refer to Figure 9.) Which illustration is correct concerning bias application and current (positive charge) flow?
a. 1.
b. 2.
c. 3.
 |
| Figure 9. Transistors |
32. Forward biasing of a solid state device will cause the device to
a. conduct via zener breakdown.
b. conduct.
c. turn off.
33. (Refer to Figure 10.) If an open occurs at R1, the light
a. cannot be turned on.
b. will not be affected.
c. cannot be turned off.
 |
| Figure 10. Transistorized Circuit |
34. (Refer to Figure 10.) If R2 sticks in the up position, the light will
a. be on full bright.
b. be very dim.
c. not illuminate.
35. (Refer to Figure 11.) Which statement concerning the depicted logic gate is true?
a. Any input being 1 will produce a 0 output.
b. Any input being 1 will produce a 1 output.
c. All inputs must be 1 to produce a 1 output.
 |
| Figure 11. Logic Gate |
36. (Refer to Figure 12.) In a functional and operating circuit, the depicted logic gate’s output will be 0
a. only when all inputs are 0.
b. when all inputs are 1.
c. when one or more inputs are 0.
 |
| Figure 12. Logic Gate |
37. (Refer to Figure 13.) Which of the logic gate output conditions is correct with respect to the given inputs?
a. 1.
b. 2.
c. 3.
 |
| Figure 13. Logic Gates |
38. Which of the following logic gates will provide an active high out only when all inputs are different?
a. XNOR.
b. NAND.
c. XOR.
39. A lead-acid battery with 12 cells connected in series (no-load voltage = 2.1 volts per cell) furnishes 10 amperes to a load of 2-ohms resistance. The internal resistance of the battery in this instance is
a. 0.52 ohm.
b. 2.52 ohms.
c. 5.0 ohms.
40. If electrolyte from a lead-acid battery is spilled in the battery compartment, which procedure should be followed?
a. Apply boric acid solution to the affected area followed by a water rinse.
b. Rinse the affected area thoroughly with clean water.
c. Apply sodium bicarbonate solution to the affected area followed by a water rinse.
 |
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