Fundamentals of electricity PART 1

Which of the following statements is false regarding the charging of several aircraft batteries together?. Batteries of different voltages (but similar capacities) can be connected in series with each other across the charger and charged using the constant-current method. Batteries of different ampere-hour capacity and same voltage can be connected in parallel with each other across the charger and charged using the constant-voltage method. Batteries of the same voltage and same ampere-hour capacity must be connected in series with each other across the charger and charged using the constant-current method.

A circuit has an applied voltage of 30 volts and a load consisting of a 10-ohm resistor in series with a 20-ohm resistor. What is the voltage drop across the 10-ohm resistor?. 10 volts. 20 volts. 30 volts.

Refer to Figure 15.) Wire 7 is used to. close the PUSH-TO-TEST circuit. open the UP indicator light circuit when the landing gear is retracted. close the UP indicator light circuit when the landing gear is retracted.

Refer to Figure 23.) If R(2) sticks in the up position, the light will. be on full bright. be very dim. not illuminate.

When referencing resistance in a parallel DC circuit, which of the following statements is true?. The current is equal in all portions of the circuit. The total current is equal to the sum of the currents through the individual branches of the circuit. The current in amperes can be found by dividing the source voltage in volts by the sum of the resistors in ohms.

Refer to Figure 16.) When electrical power is applied to the bus, which relays are energized?. PCC and TCC. TCC and TCO. PCO and PCC.

Which of the following logic gates will provide an active high out only when all inputs are different?. XNOR. NAND. XOR.

The opposition offered by a coil to the flow of alternating current (ignoring resistance) is called. impedance. reluctance. inductive reactance.

A fully charged lead-acid battery will not freeze until extremely low temperatures are reached because. the acid is in the plates, thereby increasing the specific gravity of the solution. most of the acid is in the solution. increased internal resistance generates sufficient heat to prevent freezing.

Refer to Figure 11.) Find the voltage across the 8-ohm resistor. 8 volts. 20.4 volts. 24 volts.

Typical application for zener diodes is as. full-wave rectifiers. half-wave rectifiers. voltage regulators.

Refer to Figure 64.) 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?. 36 ohms. 4 ohms. 12 ohms.

Refer to Figure 19.) When the landing gears are up and the throttles are retarded, the warning horn will not sound if an open occurs in wire. 5. 7. 6.

Refer to Figure 16.) 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. 5, 9, 10, 11, 12, 13, and 15. 3, 5, 6, 7, 11, and 13. 5, 6, 11, 12, 13, 15, and 16.

What kind of circuit protection device can be reset?. Fuse. Current limiter. Circuit breaker.

Refer to Figure 25.) In a functional and operating circuit, the depicted logic gate's output will be 0. only when all inputs are 0. when all inputs are 1. when one or more inputs are 0.

The electrolyte of a nickel cadmium battery is highest when the battery is. in a fully charged condition. in a discharged condition. under a no-load condition.

What is the total capacitance of a circuit containing three capacitors in parallel with capacitances of .02 microfarad, .05 microfarad, and .10 microfarad, respectively?. .170 uF. 0.125 pF. .0125 uF.

Refer to Figure 14.) The total resistance of the circuit is. 25 ohms. 35 ohms. 17 ohms.

Refer to Figure 1.) When different rated capacitors are connected in series in a circuit, the total capacitance is. less than the capacitance of the lowest rated capacitor. greater than the capacitance of the highest rated capacitor. equal to the sum of all the capacitances.

Which effect does not apply to the movement of electrons flowing in a conductor?. Magnetic energy. Thermal energy. Static energy.

The term that describes the combined resistive forces in an AC circuit is. resistance. reactance. impedance.

When a charging current is applied to a nickel cadmium battery, the cells emit gas. toward the end of the charging cycle. throughout the charging cycle. especially if the electrolyte level is high.

Convert farads to picofarads by. multiplying farads by 10 to the power of 12. multiplying microfarads by 10 to the power of -12. multiplying picofarads by 10 to the power of 12.

Which is correct concerning a parallel circuit?. Total resistance will be smaller than the smallest resistor. Total resistance will decrease when one of the resistances is removed. Total voltage drop is the same as the total resistance.

Refer to Figure 21.) Which symbol represents a variable resistor?. 2. 1. 3.

The presence of any small amount of potassium carbonate deposits on the top of nickel-cadmium battery cells in service is an indication of. normal operation. excessive gassing. plate sulfation.

What will a voltmeter read if properly connected across a closed switch in a circuit with electrical power on?. Voltage drop in the component(s) the switch is connected to. System voltage. Zero voltage.

Refer to Figure 8.) With an ohmmeter connected into the circuit as shown, what will the ohmmeter read?. 20 ohms. Infinite resistance. 10 ohms.

Refer to Figure 4.) How much power is being furnished to the circuit?. 575 watts. 2,875 watts. 2,645 watts.

Which requires the most electrical power during operation? (Note: 1 horsepower = 746 watts). A 12-volt motor requiring 8 amperes. Four 30-watt lamps in a 12-volt parallel circuit. Two lights requiring 3 amperes each in a 24-volt parallel system.

What is the likely result, if any, of servicing and charging nickel-cadmium and lead-acid batteries together in the same service area?. The electrolytes in each battery are the same, so there are no significant differences. The nickel-cadmium would not be affected, but the lead-acid battery could become contaminated. Contamination of both types of batteries would occur.

In an N-P-N transistor application, the solid-state device is turned on when the. emitter is positive with respect to the base. base is negative with respect to the emitter. base is positive with respect to the emitter.

Refer to Figure 11.) Find the total current flowing in the wire between points C and D. 6.0 amperes. 2.4 amperes. 3.0 amperes.

Refer to Figure 26.) Which of the logic gate output conditions is correct with respect to the given inputs?. 1. 2. 3.

What is the basic unit of electrical quantity?. Electromotive force. Ampere. Coulomb.

What is the total capacitance of a certain circuit containing three capacitors with capacitances of .25 microfarad, .03 microfarad, and .12 microfarad, respectively? (Note: C(T) = C(1) + C(2) + C(3)). .4 uF. .04 pF. .04 uF.

(Refer to Figure 23.) If an open occurs at R(1), the light. cannot be turned on. will not be affected. cannot be turned off.

If electrolyte from a lead-acid battery is spilled in the battery compartment, which procedure should be followed?. Apply boric acid solution to the affected area followed by a water rinse. Rinse the affected area thoroughly with clean water. Apply sodium bicarbonate solution to the affected area followed by a water rinse.

An increase in which of the following factors will cause an increase in the inductive reactance of a circuit?. Inductance and frequency. Resistance and voltage. Resistance and capacitive reactance.

If each cell, connected in series, equals 2 volts, how would a 12-cell lead acid battery be rated?. 24 volts. 12 volts. 6 volts.

What may result if water is added to a nickel-cadmium battery when it is not fully charged?. Excessive electrolyte dilution. Excessive spewing is likely to occur during the charging cycle. No adverse effects since water may be added anytime.

When different rated capacitors are connected in parallel in a circuit, the total capacitance is (Note: C(T) = C(1) + C(2) + C(3) . . .). less than the capacitance of the lowest rated capacitor. equal to the capacitance of the highest rated capacitor. equal to the sum of all the capacitances.

How much power must a 24-volt generator furnish to a system which contains the following loads? UNIT RATING One motor (75 percent efficient) 1/5 hp Three position lights 20 watts each One heating element 5 amp. 402 watts. 385 watts. 450 watts.