A-02 Elementary Physical, Chemical and Thermodynamic Principles Flashcards
______ heat exchangers are not usually used with steam, because condensate does not easily drain from them.
A. Plate type
B. Straight tube
C. Finned tube
D. U- tube
A. Plate type
When heat flows from molecule to molecule within a substance, or between bodies that are in direct contact, the method of heat transfer is called:
A. Convection
B. Induction
C. Conduction
D. Contraction
E. Radiation
C. Conduction
The temperature at which all molecular motion is said to completely cease is:
A. -373c
B. 0c
C. 0f
D. -460R
C. 0 K
0 K
An example of heterogeneous mixture is:
A. Sand and water
B. Soda water
C. Acid
D. Flue gas
E. Stainless steel
A. Sand and water
Which of the following statements is true?
A. In general, coefficients of expansion of solids are greater than those of liquids.
B. Liquids do not contract when cooled.
C. The coefficient of expansion for a liquid changes if the liquid temperature changes
D. Solids contract when heated
E. Water will only expand when its temperature is increased
C. The coefficient of expansion for a liquid changes if the liquid temperature changes
A substance that cannot be decomposed into other substances by chemical means is:
A. A mixture
B. A compound
C. A solution
D. An atom
E. An element
E. An element
In the Steam Tables, the numbers given for the specific volume of steam are in what units ?
A. Cubic centimeters
B. Cubic centimetres per gram
C. Cubic meters per kilogram
D. Kilograms per cubic meter
E. Grams per cubic centimeter
B. Cubic centimeters per gram
The information found in Column 9 (Labeled Hfg) of table 1 of the Steam Tables is the:
A. Specific Heat
B. Latent Heat of fusion
C. Sensible Heat of evaporation
D. Latent Heat of evaporation
E. Sensible Heat of enthalpy
D. Latent Heat of evaporation
How do you handle condensate during start up?
A. Open trap inlet valve
B. Open trap outlet valve
C. Close trap bypass valve
D. Open trap bypass
D. Open trap bypass
An example of a physical change in matter is the:
A. Reaction of sodium with chlorine
B. Boiling of a refrigerant
C. Burning of a coal
D. Rusting of a steel
E. Corrosion of boiler metal
B. Boiling of a refrigerant
An intensive physical property is one that is:
A. Dependant on the amount of matter
B. Independent of the amount of matter
C. Dependant on the volume
D. Dependent on the density of a substance
E. Dependent on the amount of pressure applied
B. Independent of the amount of matter
Natural convection is a method of heat transfer in which the movement of the fluids is due solely to the:
A. Surface pressure
B. Difference in densities
C. Action of a pump or fan
D. Gravitational differences
E. Activity of the radiant heat
B. Difference in densities
The second law of thermodynamics states that in order to transfer heat from a colder substance to a hotter substance, ______ must be supplied.
A. Internal energy
B. External work
C. Intense energy
D. Mechanical refrigeration
E. Physical labour
B. External work
In the Steam Tables, the unit used for pressure is _____ absolute l.
A. GPa
B. MPa
C. kPa
D. Bars
E. Pa
C. kPa
Radiant heat:
A. Travels in straight lines
B. Is present in oil firing but not fuel gas firing
C. Radiates through the superheater tube walls.
D. Radiates through the water in the water walls.
E. Requires a transfer medium
A. Travels in straight lines
