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General Test Guide Prepware > Basic Electricity > Flashcards

Basic Electricity Flashcards

1
Q

The working voltage of a capacitor in an AC circuit should be:
A. Equal to the highest applied voltage.
B. At least 20 percent greater than the highest applied voltage.
C. At least 50 percent greater than the highest applied voltage.

A

C. At least 50 percent greater than the highest applied voltage.

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2
Q

The term that describes the combined resistive forces in an AC circuit is:
A. Resistance.
B. Reactance.
C. Impedance.

A

C. Impedance.

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3
Q

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

A

A. Inductive reactance.

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4
Q

Electrostatic fields are also known as:
A. Dielectric fields.
B. Electrostatic fields.
C. Static fields.

A

A. Dielectric fields.

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5
Q

The basis for transformer operation in the use of alternating current is mutual:
A. Inductance.
B. Capacitance.
C. Reactance.

A

A. Inductance.

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6
Q

The opposition offered by a coil to the flow of alternating current (ignoring resistance) is called:
A. Impedance.
B. Reluctance.
C. Inductive reactance.

A

C. Inductive reactance.

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7
Q

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

A

C. Adding coils close together.

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8
Q

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

A

A. Inductance and frequency.

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9
Q

(Refer to figure 1.) when different rated capacitors are connected in series in a circuit, the total capacitance is:
A. Less than the capacitance of the lowest rated capacitor.
B. Greater than the capacitance of the highest rated capacitor.
C. Equal to the sum of all the capacitances.

A

A. Less than the capacitance of the lowest rated capacitor.

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10
Q

Capacitors are sometimes used in DC circuits to:
A. Counteract inductive reactance at specific locations.
B. Smooth out slight pulsations in current/voltage.
C. Assist in stepping voltage and current up and/or down.

A

B. Smooth out slight pulsations in current/voltage.

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11
Q

In an AC circuit, the effective voltage is:
A. Equal to the maximum instantaneous voltage.
B. Greater than the maximum instantaneous voltage.
C. Less than the maximum instantaneous voltage.

A

C. Less than the maximum instantaneous voltage.

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12
Q

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

A

C. Plate area and inversely proportional to the distance between the plates.

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13
Q

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

A

C. .0125 uF.

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14
Q

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

A

A. .170 uF.

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15
Q

Convert farads to microfarads by:
A. Multiplying farads by 10 to the power of 6.
B. Multiplying picfarads by 10 to the power of 6.
C. Multiplying microfarads by 10 to the power 6.

A

A. Multiplying farads by 10 to the power of 6.

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16
Q

Convert farads to picofarads by:
A. Multiplying farads by 10 to the power of 12.
B. Multiplying picofarads by 10 to the power of -12.
C. Multiplying microfarads by 10 to the power of 12.

A

A. Multiplying farads by 10 to the power of 12.

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17
Q

Unless otherwise specified, any values given for current or voltage in an AC circuit are assumed to be:
A. Instantaneous values.
B. Effective values.
C. Maximum values.

A

B. Effective values.

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18
Q

When different rated capacitors are connected i parallel in a circuit, the total capacitance is:
A. Less than the capacitance of the lowest rated capacitor.
B. Equal to the capacitance of the highest rated capacitor.
C. Equal to the sum of all the capacitances.

A

C. Equal to the sum of all the capacitances.

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19
Q

When inductors are connected in series in a circuit, the total inductance (where the magnetic fields of each indicator do not affect the others) is:
A. Less than the inductance of the lowest rated inductor.
B. Equal to the inductance of the highest rated inductor.
C. Equal to the sum of the individual inductances.

A

C. Equal to the sum of the individual inductances.

20
Q

(Refer to figure 3) When more than two inductors of different inductances are connected in parallel in a circuit, the total inductance is:
A. Less than the inductance of the lowest rated inductor.
B. Equal to the inductance of the highest rated inductor.
C. Equal to the sum of the individual inductances.

A

A. Less than the inductance of the lowest rated inductor.

21
Q

What is the total capacitance of a certain circuit containing three capacitors with capacitances of .25 microfarad, .03 microfarad, and microfarad, respectively?
A. .4uF.
B. .04pF.
C. .04uF.

A

A. .4uF.

22
Q

Which requires the most electrical power during operation?
A. A 12-volt motor requiring 8 amperes.
B. Four 30-watt lamps in a 12-volt parallel circuit.
C. Two lights requiring 3 amperes each in a 24-volt parallel system.

A

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

23
Q

How much power must a 24-volt generator furnish to a system which contains the following loads?
One motor (75% efficient) 1/5 HP
Three position lights 20 watts each
One heating element 5 amp
One anti collision light 3 amp
A. 402 watts.
B. 385 watts.
C. 450 watts.

A

C. 450 watts.

24
Q

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?
A. 942.5 watts.
B. 1,305.5 watts.
C. 994.6 watts.

A

C. 994.6 watts.

25
Q

The potential difference between two conductors which are insulated from each other is measured in:
A. Volts.
B. Amperes.
C. Coulombs.

A

A. Volts.

26
Q

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

A

C. Static energy.

27
Q

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?
A. 12 volts.
B. 6 volts.
C. 24 volts.

A

C. 24 volts.

28
Q

When calculating power in a reactive or inductive AC circuit, the true power is:
A. More than the apparent power.
B. Less than the apparent power in a reactive circuit and more than the apparent power in an inductive circuit.
C. Less than the apparent power.

A

C. Less than the apparent power.

29
Q

(Refer to figure 4) how much power is being furnished to the circuit?
A. 575 watts.
B. 2,875 watts.
C. 2,645 watts.

A

C. 2,645 watts.

30
Q

(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 8 ohms?
A. 22 ohms.
B. 5.29 ohms.
C. 10 ohms.

A

C. 10 ohms.

31
Q

(Refer to figure 6) If resistor R5 is disconnected at the junction of R4 and R3 as shown, what will the ohmmeter read?
A. 2.76 ohms.
B. 3 ohms.
C. 12 ohms.

A

B. 3 ohms.

32
Q

(Refer to figure 7) If resistor R3 is disconnected at terminal D, what will the ohmmeter read?
A. Infinite resistance.
B. 10 ohms.
C. 20 ohms.

A

A. Infinite resistance.

33
Q

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

A

C. 10 ohms.

34
Q

(Refer to figure 9) How many instruments (voltmeters and ammeters) are installed correctly?
A. Three.
B. One.
C. Two.

A

C. Two.

35
Q

The correct way to connect a test voltmeter in a circuit is:
A. In series with a unit.
B. Between the source voltage and the load.
C. In parallel with a unit.

A

C. In parallel with a unit.

36
Q

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

A

C. Zero voltage.

37
Q

What does the letter Q symbolize when measuring electrical charges?
A. Farad.
B. Electron.
C. Coulomb.

A

C. Coulomb.

38
Q

Which term means .001 ampere?
A. Microampere.
B. Kiloampere.
C. Milliampere.

A

C. Milliampere.

39
Q

A cabin entry light of 10 watts and a dome light f 20 watts are connected in parallel to a 30-volt source. If the voltage across the 10-watts light is measured, it will be:
A. Equal to the voltage across the 20-watt light.
B. Half the voltage across the 20-watt light.
C. One-third of the input voltage.

A

A. Equal to the voltage across the 20-watt light.

40
Q

A 14-ohm resistor is to be installed in a series circuit carrying .05 ampere. How much power will the resistor be required too dissipate?
A. At least .70 milliwatt.
B. At least 35 milliwatt.
C. Less than .035 watt.

A

B. At least 35 milliwatt.

41
Q

.002 kV equals:
A. 20 volts.
B. 2.0 volts.
C. .2 volts.

A

B. 2.0 volts.

42
Q

(Refer to figure 10) what is the measure =d voltage of the series-parallel circuit between terminals A and B?
A. 1.5 volts.
B. 3.0 volts.
C. 4.5 volts.

A

B. 3.0 volts.

43
Q

(Refer to figure 64) a 24-volt course is required to furnish 48 watts to a parallel circuit consisting of two resistors of equal value. What is the value of each resistor?
Rt = E^2/P
A. 24 ohms.
B. 12 ohms.
C. 6 ohms.

A

A. 24 ohms.

44
Q

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

A

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

45
Q

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

A

B. Watt.

46
Q

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

A

C. Coulomb.

47
Q

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

A

B. 26 ohms.

General Test Guide Prepware (12 decks)

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