Engineering Quiz: A Basic Electrical Theory Assessment Test
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- 1.Which of the following is not applicable to an AC system?
- A.
It can be transformed.
- B.
It develops eddy currents.
- C.
It can interfere with communications lines.
- D.
It is suitable for charging batteries.
- 2.
- A.
For every 20 turns in the primary, there is one turn in the secondary.
- B.
The primary voltage is 20 times greater than that of the secondary.
- C.
For every 20 rotations in the secondary, there is one rotation in the primary.
- D.
None of the above
- 3.If a motor enclosure is designed to contain sparks or flashes that could ignite surrounding vapors or gases, then the enclosure is considered to be which of the following:
- A.
Ventilated
- B.
Explosion proof
- C.
Explosion resistant
- D.
Fire proof
- 4.
- A.
Volts
- B.
Amperes
- C.
Volt-amps
- D.
Watts
- 5.In order to change the rotation of a DC series motor, which of the following must be done:
- A.
The motor must be converted to AC.
- B.
F1 and F2 must be reversed.
- C.
The capacitor leads must be reversed.
- D.
The frequency must be altered.
- 6.Bonding does which of the following:
- A.
Provides electrical continuity
- B.
Regulates the voltage
- C.
Controls the load on the system installation
- D.
All of the above
- 7.A meter used to measure both AC and DC voltage and current is known as which of the following:
- A.
An ohms meter
- B.
A multimeter
- C.
A resistance meter
- D.
None of the above
- 8.
- A.
Bushings
- B.
Couplings
- C.
Lock nuts
- D.
All of the above
- 9.If a transformer has a voltage step-down from 117 volts to 6 volts then the ratio of the transformer is equal to which of the following:
- A.
19, 5 :1
- B.
1 :19, 5
- C.
180 :1
- D.
3 :1
- 10.If the power factor of a circuit is increased, then which of the following occurs:
- A.
The active power is increased
- B.
The reactive power is decreased
- C.
Both of the above
- D.
None of the above
- 11.In a 3Ø circuit, how many electrical degrees separate each phase:
- A.
3
- B.
120
- C.
180
- D.
360
- 12.Ground fault protection for personnel on a 120 volt single-phase circuit is based on which of the following:
- A.
Ungrounded current between conductors
- B.
Unbalanced current between the grounded and ungrounded conductor
- C.
Overload in the current carrying conductor
- D.
Excessive voltage in the grounding conductor
- 13.Electrical appliances shall be installed in parallel in order to make the operation of each appliance in- dependent of the others.
- A.
True
- B.
False
- 14.
- A.
E x I x T²
- B.
Amps/Volts
- C.
E x I x T
- D.
24 /(E x I x T )
- 15.The peak value of AC voltage determines the breakdown voltage of insulation.
- A.
True
- B.
False
- 16.The efficiency of electrical equipment is determined by which of the following:
- A.
The amount of friction present
- B.
The motor speed divided by the input power
- C.
The power output divided by the input
- D.
None of the above
- 17.Inductance and capacitance are not considerations in a DC current for which of the following reasons:
- A.
DC supply has no frequency
- B.
DC supply carries power equally
- C.
Both of the above
- D.
None of the above
- 18.Two transmission wires create a corona when which of the following exists:
- A.
The wires have a high potential difference
- B.
The wires are installed overlapping or too close together
- C.
The wires are spaced too far apart
- D.
None of the above
- 19.Rearranging the control components in an electrical diagram in order to simplify tracing of a circuit is an example of a schematic diagram.
- A.
True
- B.
False
- 20.In a coil, the higher the level of self-inductance:
- A.
The lower the level of resistance will be
- B.
The longer the delay will be in establishing current through it
- C.
The greater the level of flux produced will be
- D.
None of the above
- 21.A negative charge will do which of the following: 1. I. Interact with negative charges 2. II. Interact with positive charges 3. III. Cause a short in a positive system
- A.
I & III
- B.
I & II
- C.
I only
- D.
All of the above
- 22.If a circuit breaker is installed vertically and the handle is flipped up, then the circuit breaker will be which of the following:
- A.
Off
- B.
Unable to operate properly
- C.
On
- D.
Locked in place
- 23.A dielectric electrical element is which of the following:
- A.
A capacitor
- B.
A grounding conductor
- C.
An insulator
- D.
None of the above
- 24.The electrical property of conductors that allows them to oppose the free flow of current traveling over them is measured in which of the following:
- A.
Amperes
- B.
Ohms
- C.
Volts
- D.
Watts
- 25.
- A.
Twice as much as one of the resistors
- B.
The sum of one
- C.
The difference between each resistance
- D.
None of the above
- 26.An eddy current can cause which of the following:
- A.
Power fluctuation
- B.
Unusable frequency ranges
- C.
An increase in core loss
- D.
All of the above
- 27.
- A.
The high voltage side
- B.
The primary
- C.
The secondary
- D.
The low voltage side
- 28.In order to adjust the voltage of a constant speed DC generator, the field voltage must be changed.
- A.
True
- B.
False
- 29.The most power lost in the form of heat would come from which of the following:
- A.
A short circuit
- B.
Resistance
- C.
“Z”
- D.
None of the above
- 30.In order to connect an ammeter in series, the circuit must be opened at the voltage source and connected to the meter at the other end.
- A.
True
- B.
False
- 31.Electric motors operate on the principal of induction and repulsion.
- A.
A. True
- B.
B. False
- 32.Where the current flow through a conductor is greatest will be the point where the voltage drop is the lowest.
- A.
True
- B.
False
- 33.Frequency is measured in which of the following:
- A.
Voltage
- B.
Watts
- C.
Hertz
- D.
None of the above
- 34.For electroplating power, which of the following generators should be used?
- A.
Separately excited
- B.
Delta system
- C.
Split phase
- D.
None of the above
- 35.Power factor is equal to which of the following:
- A.
Apparent power multiplied by true power
- B.
True power divided by apparent power
- C.
Watts multiplied by amps
- D.
None of the above
- 36.
- A.
$30
- B.
$50
- C.
$70
- D.
$90
- 37.
- A.
A. From the breaker to the grounding neutral
- B.
B. From hot to neutral
- C.
C. From a breaker to the cabinet
- D.
D. All of the above
- 38.Of all of the materials used for insulation, which of the following has the highest electrical breakdown strength and the longest life:
- A.
Rubber
- B.
Cloth
- C.
Impregnated paper
- D.
Colored vinyl
- 39.The combined opposition to current by resistance and reactance is which of the following:
- A.
“Z”
- B.
Impedance
- C.
Both of the above
- D.
None of the above
- 40.In a generator, voltage is produced by which of the following conditions:
- A.
Electrical pressure
- B.
Vibration
- C.
Magnetism
- D.
Cutting lines of force
- 41.A capacitor performs which of the following functions:
- A.
It opposes changes in voltage
- B.
It generators voltage
- C.
It creates changes in amperage
- D.
None of the above
- 42.
- A.
The lowest resistance has the highest current.
- B.
The lowest resistance has the highest voltage.
- C.
The highest resistance has the highest voltage.
- D.
The highest resistance has the highest current.
- 43.When reduced to the most nominal component, the smallest element of matter is which of the following:
- A.
One ohm of electrical current
- B.
An atom
- C.
Electrons
- D.
None of the above
- 44.The armature reaction in an alternator is magnetizing at lagging loads.
- A.
True
- B.
False
- 45.A three horsepower motor is equivalent to which of the following in watts:
- A.
746 watts
- B.
2238 watts
- C.
3000 watts
- D.
None of the above
- 46.During one complete rotation of 360 degrees, a three-phase 6-pole AC 34 kVA alternator on a Y- connected system will have how many cycles:
- A.
4
- B.
3
- C.
18
- D.
12
- 47.When a switch on a 110 amp system is closed, the total resistance of the switch is equal to which of the following:
- A.
A. 55 amps
- B.
B. 220 volts
- C.
C. 1100 ohms
- D.
D. Zero
- 48.The circuit conductors between service equipment and the final branch circuit overcurrent device are considered to be which of the following:
- A.
Service laterals
- B.
Feeder conductors
- C.
Grounded conductors
- D.
A wire assembly
- 49.The sum of series voltage drops equals the applied voltage.
- A.
True
- B.
False
- 50.Which of the following terms is used to describe the inductive action, which causes current to flow on the outer surface of a conductor:
- A.
Halo Effect
- B.
Inductance
- C.
Skin effect
- D.
Insulated par value
- 51.A wiring system has two lengths of wires, where wire A has a resistance of 10 ohms and wire B is three times the length of wire A with two times the cross-sectional area, which means that resistance of wire B is equal to which of the following:
- A.
30 ohms
- B.
20 ohms
- C.
15 ohms
- D.
10 ohms
- 52.The wattage rating of a resistor determines its ability to absorb heat.
- A.
True
- B.
False
- 53.Illumination is measured in which of the following units:
- A.
Lumens
- B.
Foot candles
- C.
Light per square inch
- D.
None of the above
- 54.Some copper conductors are tinned to help prevent chemical reaction:
- A.
A. True
- B.
B. False
- 55.A wire secured at one end with the other end fastened to a pole under tension is known as which of the following:
- A.
Messenger wire
- B.
A service drop
- C.
A guy wire
- D.
None of the above
- 56.Which of the following is characteristic of inductance?
- A.
It creates opposition to voltage.
- B.
It opposes changes in current.
- C.
It creates changes in current.
- D.
None of the above
- 57.Magnetic lines of force are also known as which of the following:
- A.
A. Flux
- B.
B. Alternating currents
- C.
B. Alternating currents
- D.
D. None of the above
- 58.In applications where high starting torque is required, DC series motors are generally used.
- A.
A. True
- B.
B. False
- 59.In order to correct a low power factor, which of the following should be checked first:
- A.
Resistance
- B.
Watts
- C.
Inductive load
- D.
All of the above
- 60.In an alternator, frequency is determined by which of the following:
- A.
Motor size
- B.
Rotation speed of the armature
- C.
Voltage
- D.
All of the above
- 61.In a transformer, the voltage per turn in the primary relates to the voltage per turn in the secondary in which of the following ways:
- A.
The primary is more
- B.
The secondary is more
- C.
They are the same
- D.
None of the above
- 62.In a lamp holder, which of the following is true of the grounded conductor?
- A.
It would connect to the screw shell
- B.
It is the lead wire
- C.
It would be fire-retardant
- D.
All of the above
- 63.An electrical lighting timer switch is generally connected in parallel with the lighting
- A.
True
- B.
False
- 64.Bonding safely conducts any fault currents which may arise.
- A.
True
- B.
False
- 65.If a two-wire 120 volt circuit has one grounded conductor and supplies a single-phase 5 horsepower motor, then the required number of overloads is which of the following:
- A.
Two, one in each conductor
- B.
One in the grounded conductor
- C.
One in the ungrounded conductor
- D.
Zero, no overload is required
- 66.Conductors are materials that can be charged by rubbing them against other wires.
- A.
True
- B.
False
- 67.An incandescent lamp filament is made of nickel.
- A.
True
- B.
False
- 68.Which of the following conductor types is both moisture and heat resistant?
- A.
THHN
- B.
THW
- C.
XHHW
- D.
None of the above
- 69.Electromagnetic induction involves a substance becoming a magnet when it is placed next to another magnet.
- A.
True
- B.
False
- 70.A metal halide lamp is also referred to as a quartz lamp.
- A.
True
- B.
False
- 71.Lamp holders installed in damp or wet locations shall be which of the following:
- A.
Waterproof
- B.
Insulated
- C.
Brass
- D.
None of the above
- 72.In an open circuit the resistance is equal to which of the following:
- A.
0.012 ohms
- B.
1 coulomb
- C.
Zero
- D.
Infinity
- 73.A resistor’s ability to absorb heat is gauged in which of the following units:
- A.
Watts
- B.
Ohms
- C.
Volts
- D.
Amps
- 74.The power factor for a single-phase 50 amp 100 volt electric motor that draws 25 watts is which of the following:
- A.
20
- B.
0.20
- C.
0.025
- D.
0.005
- 75.Based on Ohm’s law, the voltage of a system is equal to which of the following:
- A.
Current multiplied by the wattage
- B.
Current multiplied by the resistance
- C.
Amperes divided by the resistance
- D.
Amperes multiplied by the current
- 76.The rate of flow of the electrical charges through a conductor is which of the following:
- A.
Watts
- B.
Ohms
- C.
Voltage
- D.
Current
- 77.According the Kirchhoff’s current law, electrical current will do which of the following in Parallel circuits:
- A.
Combine in the parallel path
- B.
Divide and flow through each parallel path
- C.
Increase in voltage
- D.
Experience a voltage drop
- 78.Watts are equal to which of the following:
- A.
Voltage divided by amps
- B.
Amps multiplied by voltage times the power factor
- C.
Ohms multiplied by amps and divided by the power factor
- D.
None of the above
- 79.A centimeter is equal to which of the following:
- A.
2 1/4 inches
- B.
Inches X 2.54
- C.
1.98 inches
- D.
None of the above
- 80.Efficiency is calculated as output divided by input.
- A.
True
- B.
False
- 81.The amperage of a three-phase system can be calculated as which of the following:
- A.
Watts divided by the value of the voltage times 1.73
- B.
1.73 X watts divided by volts
- C.
Volts times 1.73
- D.
Power factor divided by the value of the voltage times 1.73
- 82.Circuits that are run in series:
- A.
Have a total voltage of 8.92 per circuit
- B.
Have a total resistance equal to the sum of all the resistors
- C.
Must be connected to a bonding jumper
- D.
All of the above
- 83.Fahrenheit temperature is converted from Centigrade by using which of the following Equations:
- A.
Dividing the Centigrade temperature by 1.8
- B.
(Temp C X 1.8) + 32
- C.
Multiplying the Centigrade temperature by 32 and adding 1.798
- D.
None of the above
- 84.The temperature of the area surrounding a conductor is known as the ambient temperature.
- A.
True
- B.
False
- 85.Arcing is defined as a luminous discharge of electricity across an insulating medium. Electric arcs operate at temperatures between and expel small particles of very hot molten materials.
- A.
1,000 and 5,000°F
- B.
2,000 and 10,000°F
- C.
5,000 and 15,000°F
- D.
10,000 and 25,000°F
- 86.A motor that draws 4.5 kilowatts from the power line and delivers 5 horsepower has an efficiency equal to which of the following:
- A.
90.5 percent
- B.
83 percent
- C.
75 percent
- D.
45 percent
- 87.
![Based on the figure below, the voltage across the 5 amp load after the neutral is opened,if both loads have resistance and the power factor is 1.0, would be which of the following:
- ProProfs]( "Based on the figure below, the voltage across the 5 amp load after the neutral is opened,if both loads have resistance and the power factor is 1.0, would be which of the following:")
Based on the figure below, the voltage across the 5 amp load after the neutral is opened,if both loads have resistance and the power factor is 1.0, would be which of the following:- A.
240 volts
- B.
180 volts
- C.
150 volts
- D.
100 volts
- 88.Lightning protection is intended to protect the building structure itself, as well as the electrical equipment on or inside the building structure.
- A.
True
- B.
False
- 89.A balanced 3-wire, 120/240V, single-phase circuit is connected so that the ungrounded conductors are from different transformer phases (Line 1 and Line 2). The current on the grounded conductor will be of the ungrounded conductor current.
- A.
0%
- B.
70%
- C.
80%
- D.
100%
- 90.Because of conductor resistance, flux leakage, eddy currents, and hysteresis losses, not all of the input power is transferred to the secondary winding for useful purposes.
- A.
True
- B.
False
- 91.
- A.
2.5 kW
- B.
5 kW
- C.
7.5 kW
- D.
15 kW
- 92.
- A.
8 kW
- B.
9 kW
- C.
11 kW
- D.
12 kW
- 93.
- A.
51A
- B.
58A
- C.
65A
- D.
80A
- 94.
- A.
15 kVA
- B.
25 kVA
- C.
37.5 kVA
- D.
50kVA
- 95.Three-phase,_____________________, wye-connected systems can overheat because of circulating odd triplen harmonic currents.
- A.
2-wire
- B.
3-wire
- C.
4-wire
- D.
None of these
- 96.If there are three resistors in a series circuit, labeled R1, R2, and R3, with a total power used of 225 watts, and the individual power used by R2 is 75 watts and by R3 is 100 watts,then the power used by resistor R1 is which of the following:
- A.
100 watts
- B.
75 watts
- C.
50 watts
- D.
25 watts
- 97.In a 100 volt circuit with a resistance of 25 ohms, the current flowing through the circuit is which of the following:
- A.
1.25 amps
- B.
2.5 amps
- C.
4 amps
- D.
5 amps
- 98.Three parallel circuits with a voltage of 150 volts each produce a total current of which of the following:
- A.
50 volts
- B.
150 volts
- C.
225 volts
- D.
450 volts
- 99.
- A.
43W
- B.
86W
- C.
172W
- D.
1,440W
- 100.Which of the following is used to control speed in a DC motor?
- A.
Field winding
- B.
A primary transformer
- C.
Ground fault breaker
- D.
A bonding jumper
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