8083 FUNDAMENTALS OF ELECTRICITY AND ELECTRONICS

iron

Through which material will magnetic lines of force pass the most readily?

permit the battery voltage to appear on the voltmeter

Troubleshooting an open circuit with a voltmeter

2.0 volts

1.2 KV equals

Rectifier

Diodes are used in electrical power circuits primarily as

in a fully charged condition

The electrolyte of a nickel-cadmium battery is highest when the battery is

smooth out slight pulsations in current/voltage

Capacitors are sometimes used in DC circuits to

994.6 watts

A 1-horsepower, 24-volt DC electric motor that is 80 percent efficient requires 932.5 watts. How much power will a 1-horsepower, 12-volt DC electric motor that is 75 percent efficient require?

1,000 watts

A 12-volt electric motor has 1,000 watts input and 1 horsepower output. Maintaining the same efficiency, how much input power does a 24-volt 1- horsepower electric motor require?

At least 35 milliwatts

A 14-ohm resistor is to be installed in a series circuit carrying .05 ampere. How much power will the resistor be required to dissipate?

24 volts

A 24-volt source is required to furnish 48 watts to a parallel circuit consisting of four resistors of equal value. What is the voltage drop across each resistor?

36 ohms

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?

equal to the voltage across the 20-watt light. B.

A cabin entry light of 10 watts and a dome light of 20 watts are connected in parallel to a 30-volt source. If the voltage across the 10-watt light is measured, it will be

0.52 ohm.

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

Open the circuit in order to allow cooling of the motor.

A thermal switch or thermal protector, as used in an electric motor, is designed to

voltage regulators

A typical application for zener diodes is as

21.2 ohms

Find the total resistance of the circuit in Figure 12-8.

By a measured discharge

How can the state-of-charge of a nickel-cadmium battery be determined?

25.23 amperes

How many amperes will a 28-volt generator be required to supply to a circuit containing five lamps in parallel, three of which have a resistance of 6 ohms each and two of which have a resistance of 5 ohms each?

14.6 amperes

How much current does a 30-volt, 1/2 horsepower motor that is 85-percent efficient draw from the bus? (Note: 1 horsepower = 746 watts

2,645 watts

How much power is being furnished to the circuit depicted in Figure 12-1 below?

450 watts

How much power must a 24-volt generator furnish to a system which contains the following loads? (Note: 1 horsepower = 746 watts)

Apply sodium bicarbonate solution to the affected area followed by a water rins

If electrolyte from a lead-acid battery is spilled in the battery compartment, which procedure should be followed?

one-fourth its original value

If the cross-sectional area of a given conductor is increased to four times its original value, and the length and temperature remain constant, the resistance of the conductor will be

0.93 amperes

If three resistors of 3 ohms, 5 ohms, and 22 ohms are connected in series in a 28-volt circuit, how much current will flow through the 3-ohm resistor?

when one or more inputs are 0.

In a functional and operating circuit, the logic gate depicted in Figure 12-14 below will be 0

24 volts

In a parallel circuit with four 6-ohms resistors across a 24-volt battery, what is the total voltage across resistor-three (VR3) in the circuit?

electrolyte becomes absorbed into the plates

Nickel-cadmium batteries, which are stored for a long period of time, will show a low liquid level because

sodium bicarbonate

Nickel-cadmium battery cases and drain surfaces, which have been affected by electrolyte, should be neutralized with a solution of

2

Referring to Figure 12-10 below, how many instruments (voltmeters and ammeters) are installed correctly?

Complete the PUSH-TO-TEST circuit

Referring to Figure 12-12 below, the No.7 wire is used to

Number 6

Referring to Figure 12-12 below, when the landing gear is down, the green light will not come on if an open condition occurs in which wire?

number 19.

Referring to Figure 12-12 below, with the landing gear retracted, the red indicator light will not come on if an open occurs in wire

be on full bright

Referring to Figure 12-13 below, if R2 sticks in the up position, the light will

cannot be turned off.

Referring to Figure 12-13 below, if an open condition occurs at R1, the light

3.0 voltgs

Referring to Figure 12-3 below, what is the measured voltage of the series-parallel circuit between terminal A and B?

24 volts

Referring to Figure 12-4 below, find the voltage across the 8-ohm resistor.

3 ohms

Referring to Figure 12-5 below, if resistor R5 is disconnected at the junction of R4 and R3 as shown, what will the ohmmeter read?

Infinite resistance

Referring to Figure 12-6 below, if resistor R3 is disconnected at terminal D, what will the ohmmeter read?

1.4 amperes

Referring to Figure 12-9, determine the total current flow in the circuit

less than the inductance of the lowest rated inductor.

Referring to the equation, when more than two inductors of different inductances are connected in parallel in a circuit, the total inductance is

plate area and inversely proportional to the distance between the plates.

The amount of electricity a capacitor can store is directly proportional to the

inductance.

The basis for transformer operation in the use of alternating current is mutual

the amperage of the circuit.

The voltage drop in a circuit of known resistance is dependent on

at least 50 percent greater than the highest applied voltage

The working voltage of a capacitor in an AC circuit should be

depends upon its temperature and the method used for charging

The end-of-charge voltage of a 19-cell nickel-cadmium battery, measured while still on charge

inductive reactance

The opposition offered by a coil to the flow of alternating current is called (disregard resistance)

Volts

The potential difference between two conductors which are insulated from each other is measured in

prevent sediment buildup from contacting the plates and causing a short circuit

The purpose of providing a space underneath the plates in a lead acid battery's cell container is to

impedance.

The term that describes the combined resistive forces in an AC circuit is

The state-of-charge of the battery

What determines the amount of current which will flow through a battery while it is being charged by a constant voltage source?

The current is stepped down by a 1 to 4 ratio

What happens to the current in a voltage step-up transformer with a ratio of 1 to 4?

Ampere

What is the basic unit of electrical quantity?

In parallel with a unit

What is the correct way to connect a test voltmeter in a circuit is?

10 ohms

What is the impedance of an AC series circuit consisting of an inductor with a reactance of 10 ohms, a capacitor with a reactance of 4 ohms, and a resistor with a resistance of 8 ohms?

26 ohms

What is the operating resistance of a 30-watt light bulb designed for a 28-volt system?

.4 μF

What is the total capacitance of a circuit containing three capacitors with capacitances of .25 microfarad, .03 microfarad, and .12 microfarad, respectively? (Note: CT = C1 + C2 + C3 ...)

Watt

What unit is used to express electrical power?

Toward the end of the charging cycle.

When a charging current is applied to a nickel- cadmium battery, the cells emit gas?

less than the apparent power

When calculating power in a reactive or inductive AC circuit, the true power is

equal to the sum of all the capacitances.

When different rated capacitors are connected in parallel in a circuit, the total capacitance is (Note: CT = C1 + C2 + C3 ...)

equal to the sum of the individual inductances.

When inductors are connected in series in a circuit, the total inductance is (where the magnetic fields of each inductor do not affect the others) (Note: LT = L1 + L2 + L3 ...)

Heat or burn marks on the hardware

Which condition is an indication of improperly torqued cell link connections of a nickel-cadmium battery?

Total resistance will be smaller than the smallest resistor

Which is correct concerning a parallel circuit?

If one of three bulbs in a parallel lighting circuit is removed, the total resistance of the circuit will increase

Which is correct in reference to electrical resistance?

3

Which of the components is a potentiometer in the Figure 12-2 below?

3

Which of the following are commonly used as rectifiers in electrical circuits? 1. Anodes 2. Resistors 3. Diodes

XOR

Which of the following logic gates illustrated in Figure 12‑14 will provide an active high output only when all inputs are different?

1 and 2

Which of the following statement(s) is/are generally true regarding the charging of several aircraft batteries together? 1. 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. 2. 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. 3. 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

Decrease the length or increase the cross sectional area.

Which of these will cause the resistance of a conductor to decrease?

Two lights requiring 3 amperes each in a 24-volt parallel system.

Which requires the most electrical power during operation? (Note: 1 horsepower = 746 watts)

A 1/5-horsepower, 24-volt motor which is 75 percent efficient

Which requires the most electrical power? (Note: 1 horsepower = 746 watts)

Any input being 1 will produce a 1 output

Which statement concerning the logic gate depicted in figure 12-13 above is true?

The total current is equal to the sum of the currents through the individual branches of the circuit.

Which statement is correct when made in reference to a parallel circuit?

The hydrometer reading does not require a temperature correction if the electrolyte temperature is 80 °F.

Which statement regarding the hydrometer reading of a lead- acid storage battery electrolyte is true?

Milliampere

Which term means .001 ampere?

10 ohms

With an ohmmeter connected into the circuit in Figure 12-7, what will the ohmmeter read?