Fundamentals of electricity PART 3

The basis for transformer operation in the use of alternating current is mutual. inductance.. capacitance. reactance.

The amount of electricity a capacitor can store is directly proportional to the. distance between the plates and inversely proportional to the plate area. plate area and is not affected by the distance between the plates. plate area and inversely proportional to the distance between the plates.

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?. 1.11 amperes. 1 ampere. 25.23 amperes.

Refer to Figure 12.) Find the total resistance of the circuit. 16 ohms. 2.6 ohms. 21.2 ohms.

When calculating power in a reactive or inductive AC circuit, the true power is. more than the apparent power. less than the apparent power in a reactive circuit and more than the apparent power in an inductive circuit. less than the apparent power.

Refer to Figure 16.) With power to the bus and the fuel selector switched to the right-hand tank, how many relays in the system are operating?. Three. Two. Four.

A 24-volt, 1-horsepower DC electric motor that is 80 percent efficient requires 932.5 watts. How much power will a 12-volt, 1-horsepower DC electric motor that is 75 percent efficient require? (Note: 1 horsepower = 746 watts). 932.5 watts. 1,305.5 watts. 994.6 watts.

What is the opposition to the flow of AC produced by an electromagnetic field (EMF) with generated back voltage called?. Inductive reactance. Capacitive reactance. Mutual inductance.

Forward biasing of a solid-state device will cause the device to. conduct via zener breakdown. conduct. turn off.

At what temperature is a battery charging adjustment necessary?. 68 degrees F. 25 degrees C. 95 degrees F.

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. equal to the voltage across the 20-watt light. half the voltage across the 20-watt light. one-third of the input voltage.

In nickel-cadmium batteries, a rise in cell temperature. causes an increase in internal resistance. causes a decrease in internal resistance. increases cell voltage.

Refer to Figure 13.) Determine the total current flow in the circuit. 0.2 ampere. 1.4 amperes. 0.8 ampere.

Which requires the most electrical power? (Note: 1 horsepower = 746 watts). A 1/5-horsepower, 24-volt motor which is 75 percent efficient. Four 30-watt lamps arranged in a 12-volt parallel circuit. A 24-volt anticollision light circuit consisting of two light assemblies which require 3 amperes each during operation.

When referring to an electrical circuit diagram, what point is considered to be at zero voltage?. The circuit breaker. The switch. The ground reference.

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. 0.52 ohm. 2.52 ohms. 5.0 ohms.

Refer to Figure 9.) How many instruments (voltmeters and ammeters) are installed correctly?. Three. One. Two.

Refer to Figure 19.) Under which condition will a ground be provided for the warning horn through both gear switches when the throttles are closed?. Right gear up and left gear down. Both gears up and the control valve out of neutral. Left gear up and right gear down.

Refer to Figure 22.) Which illustration is correct concerning bias application and current (positive charge) flow?. 1. 2. 3.

Refer to Figure 20.) Troubleshooting an open circuit with a voltmeter as shown in this circuit will. permit current to flow and illuminate the lamp. create a low resistance path and the current flow will be greater than normal. permit the battery voltage to appear on the voltmeter.

Refer to Figure 5.) 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?. 22 ohms. 5.29 ohms. 10 ohms.

What unit is used to express electrical power?. Volt. Watt. Ampere.

Capacitors are sometimes used in DC circuits to. counteract inductive reactance at specific locations. smooth out slight pulsations in current/voltage. assist in stepping voltage and current up and/or down.

In an AC circuit, the effective voltage is. equal to the maximum instantaneous voltage. greater than the maximum instantaneous voltage. less than the maximum instantaneous voltage.

Refer to Figure 16.) The TCO relay will operate if 24-volts DC is applied to the bus and the fuel tank selector is in the. right-hand tank position. crossfeed position. left-hand tank position.

Which condition is an indication of improperly torqued cell link connections of a nickel-cadmium battery?. Light spewing at the cell caps. Toxic and corrosive deposits of potassium carbonate crystals. Heat or burn marks on the hardware.

Refer to Figure 10.) What is the measured voltage of the series-parallel circuit between terminals A and B?. 1.5 volts. 3.0 volts. 4.5 volts.

Which of the following best describes the contributing factors to thermal runaway in a nickel-cadmium battery installed in an aircraft?. High internal resistance intensified by high cell temperatures and a high current discharge/charge rate in a constant potential (voltage) charging system. Low internal resistance intensified by high cell temperatures and a high voltage discharge/charge rate in a constant current charging system. Low internal resistance intensified by high cell temperatures and a high current discharge/charge rate in a constant potential (voltage) charging system.

What factors strengthen a coil inductor?. Limiting and separating the coils. Adding and separating the coils. Adding coils close together.

Refer to Figure 19.) When the throttles are retarded with only the right gear down, the warning horn will not sound if an open occurs in wire. 5. 13. 6.

Refer to Figure 15.) When the landing gear is down, the green light will not come on if an open occurs in wire. 7. 6. 17.

What is the operating resistance of a 30-watt light bulb designed for a 28-volt system?. 1.07 ohms. 26 ohms. 0.93 ohm.

A 12-volt electric motor has 1,000 watts input and 1 horsepower output. Maintaining the same efficiency, how much input power will a 24-volt, 1-horsepower electric motor require? (Note: 1 horsepower = 746 watts). 1,000 watts. 2,000 watts. 500 watts.

Refer to Figure 2.) What is the total capacitance of a circuit containing three capacitors with capacitances of .02 microfarad, .05 microfarad, and .10 microfarad, respectively?. .170 uF. 0.125 pF. .0125 uF.

Electrostatic fields are also known as. dielectric fields. electrostatic fields. static fields.

In a parallel circuit with four 6-ohm resistors across a 24-volt battery, what is the total voltage across resistor-three (VR3) in the circuit?. 6 volts. 18 volts. 24 volts.

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?. At least .70 milliwatt. At least 35 milliwatts. Less than .035 watt.

A thermal switch, or thermal protector, as used in an electric motor, is designed to. close the integral fan circuit to allow cooling of the motor. open the circuit in order to allow cooling of the motor. reroute the circuit to ground.

The end-of-charge voltage of a 19-cell nickel-cadmium battery, measured while still on charge,. must be 1.2 to 1.3 volts per cell. must be 1.4 volts per cell. depends upon its temperature and the method used for charging.

Which statement regarding the hydrometer reading of a lead-acid storage battery electrolyte is true?. The hydrometer reading does not require a temperature correction if the electrolyte temperature is 80°F. A specific gravity correction should be added to the hydrometer reading if the electrolyte temperature is below 59°F. The hydrometer reading will give a true indication of the capacity of the battery regardless of the electrolyte temperature.

Refer to Figure 3.) When more than two inductors of different inductances are connected in parallel in a circuit, the total inductance is. less than the inductance of the lowest rated inductor. equal to the inductance of the highest rated inductor. equal to the sum of the individual inductances.