Question 1

A homeowner wants to convert her basement into a recreation room. Which of the following is the best reason why the homeowner should go to the local city or town hall?
A)to purchase tools and materials for the project
B)to find the most reputable contractor for the project
C)to ask for help in estimating the cost of materials and labor for the project
D)to check for building codes and safety regulations that apply to the project

Accepted Answer

Local city or town halls provide information on building codes and safety regulations, which are crucial for any construction or renovation project to ensure compliance and safety.

Question 2

Which of the following types of lifting systems is best to use when a heavy load needs to be lifted and held precisely in place for a long period of time?
A)thermal
B)pneumatic
C)hydraulic
D)centrifugal

Accepted Answer

Hydraulic systems are best for lifting and holding heavy loads precisely in place for long periods due to their ability to exert large forces and maintain constant pressure without continuous power input, unlike pneumatic systems which rely on compressed air and may not provide the same level of precision or sustained force. Thermal and centrifugal systems are not typically used for lifting applications.

Question 3

Which of the following is a common source of an optical signal transmitted along a fiber-optic cable?
A)CRT
B)LED
C)resistor
D)transistor

Accepted Answer

LEDs (Light Emitting Diodes) are commonly used as a source of light in fiber-optic cables because they can efficiently convert electrical signals into light signals, which are then transmitted through the cable.

Question 4

Lasers are commonly used in which of the following applications?
A)disposable film cameras
B)eye surgery for nearsighted people
C)power transmission over long distances
D)TV signal transmission over coaxial cables

Accepted Answer

Lasers are widely used in various types of eye surgeries, including those for correcting nearsightedness (myopia). These procedures, such as LASIK, utilize the precision and controlled power of lasers to reshape the cornea, thereby improving vision.

Question 5

Which of the following is an example of casting?
A)A steel rod is heated and then rapidly cooled in a tank of water.
B)A molten alloy is poured into a mold where it cools and hardens.
C)A plastic pellet is forced through a die into a long, uniform shape.
D)A metal sheet is passed through smooth rollers to yield a curved piece.

Accepted Answer

Casting involves pouring molten material into a mold where it cools and solidifies into a specific shape. Option B describes this process.

Question 6

Which of the following statements best describes the functioning of an encoder in a mobile phone?
A)an antenna captures a signal
B)an LCD shows the number being dialed
C)a microphone converts sound to an electrical signal
D)a digital signal processor holds frequently dialed numbers

Accepted Answer

An encoder in a mobile phone functions by converting analog signals into digital form for processing or transmission. A microphone, which converts sound waves (analog signal) into electrical signals (digital form), is an example of an encoder's function in this context.

Question 7

Which of the following is most likely to require direct current (DC) for proper operation?
A)a blender
B)a flashlight
C)an electric heater
D)a microwave oven

Accepted Answer

Flashlights typically use batteries as their power source, which provide direct current (DC), making them most likely to require DC for proper operation.

Question 8

Which of the following examples describes a nonrenewable energy system?
A)Solar panels use energy from the Sun to heat a home.
B)Geothermal energy is used to heat water for a building.
C)Wind force turns windmill blades connected to a generator to produce electricity.
D)Coal is used to convert water into steam that turns turbine blades to produce electricity.

Accepted Answer

Coal is a nonrenewable energy source because it comes from fossil fuels that, once used, cannot be replenished on a human timescale. Solar, geothermal, and wind energy, on the other hand, are renewable as they rely on sources that are naturally replenished.

Question 9

An automobile company plans to develop an electric car to sell in urban areas. Which of the following will help the company evaluate the potential market for these cars?
A)field tests
B)scale models
C)prototype designs
D)consumer surveys

Accepted Answer

Consumer surveys are a direct method to gauge potential customer interest, preferences, and willingness to purchase the electric car, providing valuable insights into the market demand.

Question 10

Which of the following would best increase the year-round energy efficiency of a building that is subjected to hot summers and cold winters?
A)black exterior paint
B)fiberglass insulation
C)large glass windows
D)white exterior paint

Accepted Answer

Fiberglass insulation helps maintain a consistent indoor temperature by reducing heat loss in winter and heat gain in summer, improving energy efficiency year-round.

Question 11

Air in a hydraulic brake line causes the brakes to malfunction. Which property of air is most responsible for the malfunction?
A)Air is less visible than brake fluid.
B)Air changes volume under pressure.
C)Air causes corrosion in the brake line.
D)Air changes temperature under pressure.

Accepted Answer

Air is compressible and changes volume under pressure, unlike brake fluid. This compressibility leads to a spongy brake feel and decreased braking efficiency, as the pressure applied to the brake pedal is absorbed by the compression of the air instead of being transmitted to the brake pads.

Question 12

Which of the following is a function of a home TV antenna?
A)transmitter
B)storage
C)source
D)receiver

Accepted Answer

A home TV antenna functions as a receiver. It receives broadcast television signals from the airwaves and converts them into electrical signals that can be used by the television set to produce images and sound.

Question 13

In one type of home air conditioner thermostat, the case of the temperature sensor is made of metal. Which of the following is the best reason for using metal?
A)Metal convects heat easily.
B)Metal conducts heat quickly.
C)Metal consumes heat slowly.
D)Metal radiates heat efficiently.

Accepted Answer

Metal conducts heat quickly, which is essential for the temperature sensor in a thermostat to accurately detect changes in the room temperature and adjust the air conditioning accordingly. Conductivity ensures that the sensor can quickly reach thermal equilibrium with its surroundings, providing timely and accurate temperature readings.

Question 14

Which of the following is used to read a compact disc in a compact disc player?
A)polarization
B)microwaves
C)a magnet
D)a laser

Accepted Answer

A laser is used to read the information stored on a compact disc in a CD player. The laser beam reflects off the disc's surface, and a sensor detects changes in the reflection to read the stored data.

Question 15

Designers need to use a wind tunnel to test the airflow over a new design for an airplane wing. Since the wind tunnel is not large enough to hold the actual airplane wing, the designers will need to use which of the following?
A)a mockup
B)a propeller
C)a scale model
D)an orthographic projection

Accepted Answer

A scale model is a smaller or larger physical copy of an object. In this case, it allows designers to study the airflow over the airplane wing within the constraints of the wind tunnel's size.

Question 16

A circuit has a source with an electrical potential of 12 V. The circuit contains one resistor.If a second resistor is added to the circuit in series, what effect will this have on the current in the circuit?
A)The current will increase.
B)The current will decrease.
C)The current will not be affected.
D)The current will switch from DC to AC.

Accepted Answer

Adding a second resistor in series increases the total resistance of the circuit. According to Ohm's Law (V = IR), if the voltage remains constant and resistance increases, the current must decrease.

Question 17

In which of the following fluid systems does the fluid remain within the system?
A)compressed air in a gas station
B)steam engine on a railroad train
C)forced hot water heating in a home
D)forced hot air heating in a car repair shop

Accepted Answer

In a forced hot water heating system in a home, the water circulates within the system (pipes and radiators) and does not leave it. This is a closed system where the fluid (water) is reused continuously.

Question 18

Digital information is transmitted over fiberoptic cable as pulses of which of the following?
A)electricity
B)light
C)microwaves
D)sound

Accepted Answer

Digital information is transmitted over fiberoptic cables as pulses of light, which can travel long distances with very little loss of signal.

Question 19

A structural component for a bridge needs to be especially strong in tension. Which of the following materials would be mostsuitable for this component?
A)concrete
B)copper
C)steel
D)wood

Accepted Answer

Steel is known for its high tensile strength, making it an ideal material for structural components of a bridge that need to withstand significant tension.

Question 20

A company sent prototypes of a newly designed hair dryer for trial use to 100 homes along with a satisfaction survey. A month later the company received 82 completed surveys.This process is part of which of the following steps in the engineering design process?
A)developing possible solutions
B)communicating the solution
C)researching the problem
D)evaluating outcomes

Accepted Answer

Sending prototypes for trial use and collecting satisfaction surveys is part of evaluating outcomes. This step involves testing the solution (in this case, the newly designed hair dryer) in real-world conditions and gathering feedback to assess if the design meets the intended goals and requirements.

Quiz 6: Technology: Technology-Engineering

A homeowner wants to convert her basement into a recreation room. Which of the following is the best reason why the homeowner should go to the local city or town hall?

Which of the following types of lifting systems is best to use when a heavy load needs to be lifted and held precisely in place for a long period of time?

Which of the following is a common source of an optical signal transmitted along a fiber-optic cable?

Lasers are commonly used in which of the following applications?

Which of the following is an example of casting?

Which of the following statements best describes the functioning of an encoder in a mobile phone?

Which of the following is most likely to require direct current (DC) for proper operation?

Which of the following examples describes a nonrenewable energy system?

An automobile company plans to develop an electric car to sell in urban areas. Which of the following will help the company evaluate the potential market for these cars?

Which of the following would best increase the year-round energy efficiency of a building that is subjected to hot summers and cold winters?

Air in a hydraulic brake line causes the brakes to malfunction. Which property of air is most responsible for the malfunction?

Which of the following is a function of a home TV antenna?

In one type of home air conditioner thermostat, the case of the temperature sensor is made of metal. Which of the following is the best reason for using metal?

Which of the following is used to read a compact disc in a compact disc player?

Designers need to use a wind tunnel to test the airflow over a new design for an airplane wing. Since the wind tunnel is not large enough to hold the actual airplane wing, the designers will need to use which of the following?

A circuit has a source with an electrical potential of 12 V. The circuit contains one resistor.If a second resistor is added to the circuit in series, what effect will this have on the current in the circuit?

In which of the following fluid systems does the fluid remain within the system?

Digital information is transmitted over fiberoptic cable as pulses of which of the following?

A structural component for a bridge needs to be especially strong in tension. Which of the following materials would be mostsuitable for this component?

A company sent prototypes of a newly designed hair dryer for trial use to 100 homes along with a satisfaction survey. A month later the company received 82 completed surveys.This process is part of which of the following steps in the engineering design process?