- With the exception of water, all liquids expand ____________ to temperature change when heated.
a. in direct proportion
b. faster
c. inversely proportional
d. slower
e. exponentially
a. in direct proportion
- The change in length per unit length per degree rise in temperature is known as the:
a. Specific heat
b. Coefficient of linear expansion
c. Coefficient of conductivity
d. Latent heat of fusion
e. Latent heat of evaporation
b. Coefficient of linear expansion
- One factor that determines the amount of thermal expansion of an object is the nature of the material itself. Through experimentation, each material is assigned a coefficient value, which is then applied to expansion calculations involving that material.
a. True
b. False
a. True
- The amount of increase in area of each surface will depend on the:
a. Rate of thermal conductivity.
b. Time allowed for heating.
c. Coefficient of surface expansion.
d. Change of thickness of the material.
e. Specific heat.
c. Coefficient of surface expansion.
- What is the coefficient expansion for glass?
a. 10.4 X 10-6
b. 19.5 x 10-6
c. 9.4 x 10-4
d. 9.0 x 10-6
e. None of the above
d. 9.0 x 10-6
- A copper rod of the same dimensions as a steel rod will:
a. Expand more for a given temperature change.
b. Expand less for a given temperature change.
c. Heat up slower for a given amount of heat.
d. Have the same mass.
e. Expand the same at all temperatures.
a. Expand more for a given temperature change.
- Expansion will result in an increase in a body’s surface as well as its ________________.
a. temperature
b. coefficient
c. volume
d. pressure
e. location
c. volume
- The coefficient of expansion for solids is______________.
a. constant for all solids
b. or has the same result for all metals
c. or has no bearing on the volumetric expansion
d. that we have different values for different substances.
e. that it can be determined by the formula Cp/Cv.
d. that we have different values for different substances.
- Heat will flow from a hot substance to a colder substance unaided, but it is impossible for heat to flow from a cold substance to a hotter one without the aid of mechanical work is:
a. The First Law of Thermodynamics
b. Charles’ Law
c. The mechanical equivalent of heat
d. The Second Law of Thermodynamics
e. The General Gas Law
d. The Second Law of Thermodynamics
- The Second Law of Thermodynamics deals with:
a. Speed of heat flow
b. Type of heat flow
c. Work and heat conversion
d. Quantity of heat flow
e. Direction of heat flow
e. Direction of heat flow
- Transfer of heat by convection depends upon:
a. The molecular structure of the fluid.
b. A dense fluid being displaced by a less dense fluid.
c. The color and the texture of the surface of the fluid.
d. The viscosity of the fluid.
e. A less dense fluid being displaced by a denser fluid.
e. A less dense fluid being displaced by a denser fluid.
- Heat will always flow between two bodies if they are ___________________.
a. at different temperatures
b. different colors
c. close to each other
d. in a solid state or phase only
e. of the same material in construction
a. at different temperatures
- The three methods by which transfer of heat energy takes place is:
1. Convection 2. Sensible 3. Conduction 4. Latent 5. Enthalpy 6. Radiation
a. 1, 4, 6
b. 2, 3, 5
c. 1, 3, 6
d. 3, 4, 6
e. 2, 4, 5
c. 1, 3, 6
- Conduction of heat takes place:
a. From ion to ion within the substance.
b. By a difference in densities of the substance.
c. In straight lines much like the sun’s rays.
d. By convection currents.
e. None of the above
e. None of the above
- The transfer of heat by convection involves the:
a. Reduction of mass
b. Movement of a fluid
c. Transfer of elements
d. Radiation of light
e. Contact between molecules
b. Movement of a fluid
- Radiation refers to:
a. Mechanical energy transmission.
b. The transmission of energy waves.
c. Transfer of heat from molecule to molecule.
d. Transfer of heat by different densities.
e. Transfer of heat by fluid flow.
b. The transmission of energy waves.
- Radiant energy waves are:
a. Able to pass through a vacuum.
b. Those that travel in straight lines.
c. Absorbed, reflected or transmitted by other bodies.
d. Absorbed and converted into heat.
e. All of the above
e. All of the above
- ___________ has the lowest thermal conductivity.
a. Aluminum
b. Brass
c. Copper
d. Air
e. Steel
d. Air
- The thermal conductivity is a property of a material and has a different value for each different material.
a. True
b. False
a. True
- The rate at which the heat flow takes place by conduction depend upon the temperature difference and the ____________________________.
a. thickness through which the flow takes place
b. type of material through which the flow takes place
c. area of the object the heat flows through
d. temperature difference through the material
e. All of the above
e. All of the above
- The ratio of the coefficient of volumetric expansion of a material to the coefficient of linear expansion of the same material is:
a. The square of the coefficient of linear expansion.
b. The cube of the coefficient of linear expansion.
c. 2 to 1
d. 3 to 1
e. 9 to 1
d. 3 to 1
- If a mild steel cube of side 40 mm is heated from 25°C to 50 °C, the increase in volume will be?
a. 5.76 cu mm
b. 19.2 cu mm
c. 57.6 cu mm
d. 192 cu mm
e. 64 000 cu mm
c. 57.6 cu mm
- A 110 m long mild steel pipe in a refinery conveys oil at a maximum temperature of 140°C. In the winter the plant is shut down, and the temperature of the pipeline drops to -25°C. Calculate the amount of shrinkage of the pipe.
a. 0.151 8 cm
b. 0.217 8 cm
c. 15.18 cm
d. 21.78 cm
e. 65.34 cm
d. 21.78 cm
- The coefficient of volumetric expansion for solids is:
a. The cube of the coefficient of linear expansion.
b. Three times the coefficient of linear expansion.
c. Two times the coefficient of linear expansion.
d. The inverse of the coefficient of linear expansion.
e. The square root of the coefficient of linear expansion.
b. Three times the coefficient of linear expansion.
