Q&A Hero

Civil Engineering

Q: Every engineer needs to understand the fundamentals of electricity and magnetism. a. True b. False
Q: A degree-day (DD) is the difference between 65F (typically) and the average temperature of the outside air during a 24-hour period. a. True b. False
Q: The energy released by fuel when the combustion by-products include water in vapor form is known as the a. higher heating value b. lower heating value c. all of the above d. none of the above
Q: The energy released by fuel when the combustion by-products include water in liquid form is known as the a. higher heating value b. lower heating value c. all of the above d. none of the above
Q: The term that is used to quantify the amount of energy that is released when a unit mass or a unit volume of fuel is burned is known as a. heating value b. specific heat c. specific mass d. specific volume
Q: Most conventional fuels that we use today to generate power come from coal, natural gas, oil, or gasoline. a. True b. False
Q: How much energy is required to raise the temperature of of aluminum from to ?
Q: You wish to make a large cup of tea. How much energy is needed to raise the temperature of 500 ml of tap water from to ?
Q: A steel bridge is 150 m long when the temperature is . By how much will its length increase when the temperature is ? (Steel has a coefficient of linear expansion of
Q: The physical quantity that provides a quantitative way to show how much thermal energy is required to raise the temperature of an object by a certain amount is a. thermal conductivity b. specific heat c. specific weight d. density
Q: In general, as the temperature of a material is increased, the material's volume will a. increase b. decrease c. remain the same
Q: In general, as the temperature of a material is increased, the material's length will a. increase b. decrease c. remain the same
Q: A unit that is generally used to express the insulating value of clothing is called a. clo b. ciu c. cins d. ivc
Q: A unit commonly used to express the metabolic rate for an average person under sedentary conditions is called a. metabavg b. mravg c. met d. msed
Q: The physical measurement that is intended to account for the combined effect of wind speed and air temperature is known as a. Dew point b. Ambient conditions c. Wind chill index b. Relative temperature
Q: If you stay out too long at the beach you may get a sunburn as a result of too much heat being transferred to your skin. What mode of heat transfer is responsible for this? a. conduction b. convection c. radiation d. none of the above
Q: Before taking a bite of a piece of hot pizza you blow on it to cool it What mode of heat transfer are you using in this situation? a. conduction b. convection c. radiation d. none of the above
Q: When you touch a hot object with your finger, the heat transferred to your finger is by a. conduction b. convection c. radiation d. none of the above
Q: All matter emits thermal radiation. This rule is true as long as the body in question is at a nonzero absolute temperature. a. True b. False
Q: For both the forced and the free convection situations, the overall heat transfer rate between the fluid and the surface is governed by Fourier's law of cooling. a. True b. False
Q: The mode of heat transfer that occurs when a fluid in motion comes into contact with a solid surface whose temperature differs from the moving fluid is known as a. conduction b. convection c. radiation d. none of the above
Q: The R-value or R-factor of a material provides a measure of resistance to heat flow: The higher the value, the less resistance to heat flow the material offers. a. True b. False
Q: Thermal conductivity is a property of materials that shows how good the material is in transferring thermal energy (heat) from a high-temperature region to a low-temperature region within the material. a. True b. False
Q: The mode of heat transfer that occurs when a temperature difference exists in a medium is known as a. conduction b. convection c. radiation d. none of the above
Q: What is the SI unit of thermal energy? a. Calorie b. Watt c. Btu d. Joule
Q: The energy content of food is typically expressed in Calories, which is equal to 1000 calories. a. True b. False
Q: The amount of heat required to raise the temperature of of water by is known as a a. Btu b. calorie c. Calorie d. Joule
Q: The amount of heat required to raise the temperature of 1 lbm of water by is known as a a. Btu b. calorie c. Calorie d. Joule
Q: What does Btu stand for? a. British temperature unit b. British thermal unit c. British thermocouple unit d. Binary temperature unit
Q: Heat flows naturally from a hot object to a cold objects. a. True b. False
Q: Which of the following is NOT a mode of heat transfer? a. transposition b. convection c. radiation d. conduction
Q: A temperature difference in Celsius is equal to a temperature difference in Kelvin. a. True b. False
Q: A temperature difference in Celsius is equal to a temperature difference in Fahrenheit. a. True b. False
Q: The temperature in this room is . The temperature outside the building is . What is the temperature difference in degrees Celsius? a. b. c. d.
Q: The temperature in a room is . The temperature outside the building is . What is the temperature difference in Kelvins? a. 52 K b. 11 K c. 20 K d. 29 K
Q: When using the ideal gas law, , what system of units should you use when entering temperature values? a. Fahrenheit b. Celsius c. Kelvin d. any of the above
Q: What does T stand for in the following equation (ideal gas law)? a. Time b. Period c. Torque d. Temperature
Q: What does V stand for in the following equation (ideal gas law)? a. Volume b. Velocity c. Voltage d. Viscosity
Q: What does P stand for in the following equation (ideal gas law)? a. Pounds b. Pressure c. Power d. Permeability
Q: The Kelvin and Rankine scales are based on the behavior of an ideal gas. a. True b. False
Q: Which of the following temperature scales is known as an absolute scale? a. Rankine b. Kelvin c. all of the above
Q: Which of the following temperature scales is known as an absolute scale? a. Fahrenheit b. Celsius c. Centigrade d. Kelvin
Q: Convert to Kelvins
Q: Convert to Kelvins
Q: Convert to Fahrenheit
Q: Convert to Celsius
Q: A temperature-measuring device composed of a semiconductor material is known as a a. Thermocouple b. Thermistor c. Thermojunction d. RTD
Q: A temperature-measuring device that consists of two dissimilar metals is known as a a. Thermocouple b. Thermistor c. Thermojunction d. RTD
Q: Thermometers use varying physical properties to measure temperature. Which of the following variable physical properties are utilized in thermometers? a. expansion b. electrical resistance c. color d. all of the above
Q: Temperature is a macroscopic measurement of a microscopic phenomenon. a. True b. False
Q: The physical quantity that quantifies or provides a measure of how active molecules are on a microscopic level is a. density b. temperature c. viscosity d. specific weight
Q: The physical quantity that provides a measure of molecular activity and the internal energy of an object is a. density b. temperature c. viscosity d. specific weight
Q: Which of the following material properties varies with temperature? a. density b. viscosity c. electrical resistance d. all of the above
Q: Temperature is a fundamental dimension. a. True b. False
Q: Material properties are not a function of temperature. a. True b. False
Q: Civil engineers must design the structures in such a way as to allow for expansion and contraction of materials, such as concrete and steel that occur due to changes in the surrounding temperatures. a. True b. False
Q: Mechanics deals with the study of behavior of objects or structural members when subjected to forces. a. True b. False
Q: Linear impulse represents the net effect of a force acting over a period of time and brings about a change in the linear momentum of the object. a. True b. False
Q: The modulus of rigidity is a measure of how easily a material can be twisted or sheared. a. True b. False
Q: The value of fluid bulk modulus shows how easily the volume of the fluid can be reduced when the pressure acting on it is increased. a. True b. False
Q: A brittle material, when subjected to a tensile load, will go through significant permanent deformation before it breaks. a. True b. False
Q: A ductile material shows little or no permanent deformation before it ruptures. a. True b. False
Q: The modulus of elasticity is a measure of how easily a material will stretch when pulled (subject to a tensile force) or how well the material will shorten when pushed (subject to a compressive force). a. True b. False
Q: The modulus of elasticity, or Young's modulus, is computed by calculating the slope of a stress-strain diagram over the elastic region. a. True b. False
Q: Stress provides a measure of the intensity of internal forces acting over an area. a. True b. False
Q: Geometric properties of an object such as its length, area, and first and second moment of area do not play significant roles in the way the object responds to a force. a. True b. False
Q: The absolute pressure is related to the gauge pressure according to a. True b. False
Q: A "teeter-totter" (or "see-saw" if you prefer) has a 50 lb child sitting at one end, 10 ft from the center pivot point (fulcrum). How far from the center point should a 125 lb adult sit in order to balance the teeter-totter? a. 2.5 ft b. 4 ft c. 6.5 ft d. 10 ft
Q: Calculate the torque produced by a 50 N perpendicular force at the end of a 20 cm-long wrench. a. 10 N.m b. 1000 N.m c. 2.5 N/m d. 0.4 cm/N
Q: A "suction cup" sticks to the wall because it is a. pulled to the wall by vacuum b. pushed to the wall by the atmospheric pressure c. both of these d. none of the above
Q: What is the SI unit for pressure? a. b. c. d.
Q: Pressure is a fundamental dimension. a. True b. False
Q: Identify the force that accelerates a car: a. the car pushing on the road b. the road pushing on the car c. the engine pushing on the wheels d. the wheels pushing on the engine
Q: A tow truck exerts a force of on a car, causing it to accelerate at . What is the mass of the car? a. 45 slugs b. 45 lbm c. 45 kg d. None of the above
Q: A tow truck exerts a force of on a car, causing it to accelerate at . What is the mass of the car? a. b. c. d. e. None of the above
Q: If a small sports car collides head-on with a massive truck, which vehicle experiences the greater impact force? Which vehicle experiences the greater acceleration due to the impact?
Q: What does g stand for in the following equation? a. Weight b. Gallons c. Acceleration due to gravity d. none of the above
Q: What does W stand for in the following equation? a. Weight b. Work c. Watts d. none of the above
Q: What does F stand for in the following equation? a. Gravitational force b. Friction c. Viscous friction d. Weight
Q: What does r stand for in the following equation? a. Radius of the earth b. Universal gravitational constant c. Resistance d. Center-to-center distance between objects
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