Question 1

In certain circuits, if one of the elements fails, that failure prevents the current from flowing through other elements in the circuit; thus the entire circuit fails.This type of circuit is a
A)parallel circuit
B)series circuit
C)none of the above

Accepted Answer

This type of circuit is a series circuit, where the elements are connected one after the other in a single path. If one element fails, it breaks the circuit and prevents current flow to other elements in the circuit.

Question 2

A numbering system that describes the size of an electric conductor is AWG.What does AWG stand for?
A)American Wire Gage
B)Association of Wire Gages
C)Atlas of Wire Gages
D)All Wire Gages

Accepted Answer

AWG stands for American Wire Gage.

Question 3

Ohm's law describes the relationship between voltage, resistance, and current.Which of these is Ohm's law?
A) 
B) 
C) 
D)

Accepted Answer

The answer of Ohm's law describes the relationship between voltage,...

Question 4

Electrical resistance is a fundamental dimension.

Accepted Answer

Electrical resistance is not a fundamental dimension; it is derived from fundamental dimensions such as length, mass, time, and electric current.

Question 5

Most indoor fluorescent light fixtures contain two or three 40-watt bulbs each.If a classroom has 15 fluorescent light fixtures, each with three 40-watt bulbs, how much does it cost to leave the lights on for a two-hour class? Assume the electric company charges approximately 10 cents per kilowatt-hour.

Accepted Answer

The answer of Most indoor fluorescent light fixtures contain two...

Question 6

Electrical components that store energy on two oppositely charged electrodes, rather than through a chemical reaction are known as
A)batteries
B)inductors
C)transistors
D)capacitors

Accepted Answer

Batteries store energy chemically, inductors store energy in a magnetic field, and transistors are not components that store energy. Capacitors, on the other hand, store energy on two oppositely charged electrodes separated by a dielectric material. When a voltage is applied, electrons accumulate on one plate, creating a negative charge, while the other plate becomes positively charged. This creates an electric field that stores energy, which can be released when the capacitor is discharged.

Question 7

In lighting design, a variable called CRI is often used.What does CRI stand for?
A)Color Repeatability Index
B)Color Rendition Index
C)Capacitive-Resistive Index
D)none of the above

Accepted Answer

CRI stands for Color Rendition Index, which is a quantitative measure of how well a light source can reproduce the colors of objects in comparison to a natural light source. A higher CRI value indicates that a light source can accurately reproduce more colors, making it more desirable for tasks that require accurate color perception such as in art studios, hospitals, and retail stores.

Question 8

The electrical resistance of a material does not vary with temperature.

Accepted Answer

The electrical resistance of most materials changes with temperature; for conductors, resistance typically increases with temperature, while for semiconductors, it usually decreases.

Question 9

A common unit of illumination intensity is called a footcandle and is equal to
A)the amount of light one foot away from a candle.
B)the amount of light from a one-foot long candle.
C)one lumen distributed over an area of 1-square-foot.
D)none of the above

Accepted Answer

A footcandle is defined as one lumen of light distributed over an area of 1-square-foot, so choice C is the correct answer. Choice A involves a candle, which is not a standard unit of measurement for light intensity. Choice B mentions a one-foot long candle, which is not a standard unit of measurement for either length or light intensity. Choice D is a blanket statement that does not provide any correct information.

Question 10

According to a light bulb manufacturer, its 75 W CFL floodlight consumes 25 W and produces 1500 lumens.What is the efficacy of the floodlight?

Accepted Answer

The answer of According to a light bulb manufacturer, its...

Question 11

How many kW-hour is consumed by a TV set that uses 250 watts when it is left on for 4 hours?
A)250
B)1000
C)1
D)0.25

Accepted Answer

To calculate the energy consumed in kWh, we need to convert the watts to kilowatts and multiply by the time in hours.

250 watts = 0.25 kilowatts

Energy consumed = Power x Time 
= 0.25 kW x 4 hours

= 1 kWh

Therefore, the answer is C) 1.

Question 12

The ratio of the diameter of No.1 AWG wire to No.2 is
A)1.25
B)1.5
C)2.0
D)1.12

Accepted Answer

The diameter of No.1 AWG wire is approximately 1.12 times that of No.2 AWG wire according to the American Wire Gauge system.

Question 13

the amount of light emitted by a lamp is expressed in lumens.

Accepted Answer

Lumens are the unit of measure for the amount of light emitted by a lamp.

Question 14

Some of the factors that engineers consider when selecting a motor for an application are:
A)motor type and speed (rpm).
B)motor performance and efficiency.
C)cost, life expectancy, and noise level.
D)maintenance and service requirements.
E)all of the above

Accepted Answer

All of the above factors are important considerations when selecting a motor for an application. The motor type and speed (rpm) must be chosen to match the requirements of the application. Motor performance and efficiency are critical to ensure that the motor can handle the load and operate with the required power consumption. Cost, life expectancy, and noise level are important factors to consider from a budget and operational standpoint. Maintenance and service requirements are also important to ensure that the motor remains operational over its lifespan. Therefore, all of the factors listed above should be taken into account when selecting a motor for an application.

Question 15

The distribution of light on a horizontal surface is known as
A)luminescence
B)luminosity
C)illuminescence
D)illumination

Accepted Answer

The distribution of light on a horizontal surface is referred to as illumination. Choice D is the only option that correctly identifies this term. Luminescence refers to the emission of light from a substance that has not been heated, while luminosity refers to the total amount of energy radiated by a star. Illuminescence is not a commonly used term in the field of lighting or physics.

Question 16

When it comes to wire size, the larger the gage number the larger the wire diameter.

Accepted Answer

The larger the gauge number, the smaller the wire diameter.

Question 17

Some materials exhibit near-zero resistance at very low temperatures.This behavior is called
A)infra-resistance
B)anti-resistance
C)semiconductivity
D)superconductivity

Accepted Answer

The behavior described above is called superconductivity.

Question 18

Capacitors are used for
A)energy storage
B)electronic filters
C)timing elements
D)all of the above

Accepted Answer

Capacitors are used for all of the above purposes. They are commonly used for energy storage in electronic circuits, as well as for tuning and filtering signals in electronic devices. They also function as timing elements in oscillator circuits.

Question 19

The ratio of how much light is produced by a lamp (in lumens) to how much energy is consumed by the lamp (in watts) is known as
A)efficacy
B)efficiency
C)illumination cost
D)energy cost

Accepted Answer

The ratio of lumens produced per watt consumed is known as efficacy. It is a measure of how efficiently a light source converts electrical energy into visible light. Efficiency, on the other hand, is a measure of how effectively the electrical energy is being used, regardless of the amount of light produced. Illumination cost and energy cost are not the correct terms for this ratio.

Question 20

One kilowatt hour represents the amount of power consumed during 1 hour by a device that uses one kilowatt (kW).

Accepted Answer

This is the definition of a kilowatt hour.

Quiz 12: Electric Current and Related Variables in Engineering

In certain circuits, if one of the elements fails, that failure prevents the current from flowing through other elements in the circuit; thus the entire circuit fails.This type of circuit is a

A numbering system that describes the size of an electric conductor is AWG.What does AWG stand for?

Ohm's law describes the relationship between voltage, resistance, and current.Which of these is Ohm's law?

Electrical resistance is a fundamental dimension.

Electrical components that store energy on two oppositely charged electrodes, rather than through a chemical reaction are known as

In lighting design, a variable called CRI is often used.What does CRI stand for?

The electrical resistance of a material does not vary with temperature.

A common unit of illumination intensity is called a footcandle and is equal to

According to a light bulb manufacturer, its 75 W CFL floodlight consumes 25 W and produces 1500 lumens.What is the efficacy of the floodlight?

How many kW-hour is consumed by a TV set that uses 250 watts when it is left on for 4 hours?

The ratio of the diameter of No.1 AWG wire to No.2 is

the amount of light emitted by a lamp is expressed in lumens.

Some of the factors that engineers consider when selecting a motor for an application are:

The distribution of light on a horizontal surface is known as

When it comes to wire size, the larger the gage number the larger the wire diameter.

Some materials exhibit near-zero resistance at very low temperatures.This behavior is called

Capacitors are used for

The ratio of how much light is produced by a lamp (in lumens) to how much energy is consumed by the lamp (in watts) is known as

One kilowatt hour represents the amount of power consumed during 1 hour by a device that uses one kilowatt (kW).