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25 Cards in this Set
- Front
- Back
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1) When two or more atoms combine chemically, the paricle thus formed is a ---
(A) molecule (B) nucleus (C) mixture (D) proton |
(A) molecule
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2) A compound is formed when the atoms of two or more elements become ---
(A) closely mixed (B) chemically bonded (C) divided into simpler particles (D) changed within their kernels |
(B) chemically bonded
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3) Water is ----
(A) an element (B) a compound (C) a mixture (D) a composition of hydrogen and helium |
(B) a compound
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4) Which of the four elements listed is the lightest per cubic foot?
(A) carbon (B) calcium (C) barium (D) aluminum |
(B) calcium
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5) Our air (or atmosphere) is composed by volume of ---
(A) 21% nitrogen and 79% oxygen (B) 21% oxygen and 79% cabon dioxide (C) 21% oxygen and 79% nitrogen (D) 21% oxygen and 79% hydrogen |
(C) 21% oxygen and 79% nitrogen
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6) Atmospheric pressure at sea level is normally considered to be approximately ---
(A) 4.17 psi (B) 7.14 psi (C) 14.7 psi (D) 17.4 psi |
(C) 14.7 psi
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7) Liquids offer a high resistance to any force tending to change their ---
(A) fluidity (B) volume (C) specific gravity (D) temperature |
(B) volume
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8) When the temperature of a substance increases, the substance becomes less dense because ---
(A) the mass of each molecule decreases (B) its volume decreases (C) ther are fewer molecules per unit volume (D) ther molecules become more closely packed |
(C) ther are fewer molecules per unit volume
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9) A characteristic of a fluid which indicates its opposition to a change in flow or shape is its ---
(A) specific gravity (B) buoyancy (C) density (D) viscosity |
(D) viscosity
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10) A pound is a unit of ---
(A) energy (B) tenacity (C) force (D) density |
(C) force
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11) Fluid pressure might be expressed properly by ---
(A) area/force (B) area x height (C) lbs/in squared (D) lbs/in cubed |
(C) lbs/in squared
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12) Water has a density of 62.4 lbs/cubic feet. The volume of 1000 pounds of water is ---
(A) 16 cubic feet (B) 43.3 cubic feet (C) 433 cubic feet (D) 62,400 cubic feet |
(A) 16 cubic feet
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13) Specific weight most nearly means ---
(A) gravity (B) volume (C) force (D) density |
(D) density
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14) A temperature reading of 59 degrees F is equivolent to ---
(A) 145.8 degrees C (B) 50.1 degrees C (C) 48.6 degrees C (D) 15 degrees C |
(D) 15 degrees C
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15) The volume of a vertical cylindrical tank having inside measurements of 36 inches in diameter and 10 feet high is ---
(A) 70.686 cubic feet (B) 47.124 cubic feet (C) 282.744 cubic feet (D) 282.744 cubic inches |
(A) 70.686 cubic feet
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16) If the tank in question #15 is filled to the top with oil whose density is 72 lbs/cubic foot, what pressure in pounds per square inch is being exerted on its base?
(A) 5 psi (B) 7.2 psi (C) 72 psi (D) 720 psi |
(A) 5 psi
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17) What is the total force being exerted over a butterfly valve area when the head tank is filled with water?
(A) less than 20,000 lbs (B) between 20,000 and 30,000 lbs (C) between 30,000 and 40,000 lbs (D) greater than 80,000 lbs |
(D) greater than 80,000 lbs
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18) The term viscosity most nearly means ---
(A) resistance to fluid flow (B) ability to support an object (C) the ability to exert force (D) the tendancy for molecules to stick together |
(A) resistance to fluid flow
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19) To convert gauge pressure to absolute pressure at sea level conditions ---
(A) subtract 14.7 (B) add 14.7 (C) add 17.4 (D) add (14.7 X 0.433) |
(B) add 14.7
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20) A deaerating heater storage tank conveys water to the boiler feed pumps located 100 feet below the level of the deaerating storage tank. The pressure at the boiler feed pump suction due to the head from the storage tank is most nearly ---
(A) 433.3 psi (B) 112.6 psi (C) 43.3 psi (D) none of the above |
(C) 43.3 psi
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21) The pressure upward at any given point in a liquid is ____ the downward pressure at that point
(A) less than (B) the same as (C) greater than (D) unrelated to the |
(B) the same as
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22) Pressure in lbs/square inch against the large piston of a hydraulic press is ---
(A) proportional to area (B) proportional to diameter (C) the same as that against the small piston (D) greater than that against the small piston |
(C) the same as that against the small piston
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23) A piece of concrete weighs 400 lbs in air and 350 lbs in water. What is its specific gravity?
(A) 80 (B) 50 (C) 8 (D) 0.8 |
(C) 8
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24) Density is a ratio between weight and ---
(A) mass (B) water (C) volume (D) velocity |
(C) volume
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25) When an object is suspended in water the weight that appears to be lost is ---
(A) negligible (B) equal to the weight of water that it displaces (C) always greater than its own weight (D) equal to its density |
(B) equal to the weight of water that it displaces
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