Ure 2F071 Pretest
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CDC 2F071Volumes I, II, III UREs
- 1.What is a major difference between a gas and a liquid?
- A.
A liquid is far less compressible than a gas.
- B.
A gas is far less compressible than a liquid.
- C.
A liquid is more combustible than a gas.
- D.
A gas is more combustible than a liquid.
- 2.What is the lifting force of a liquid called?
- A.
Laminar
- B.
Interface
- C.
Buoyance
- D.
Dynamic pressure
- 3.Which best describes immiscible liquids?
- A.
They mix well together
- B.
One liquid will float on the other
- C.
They will become an entrained solution
- D.
They will repel each other and react violently
- 4.Which unit of measurement would indicate velocity of flow?
- A.
Feet per second
- B.
Gallons per minute
- C.
Cubic feet per second
- D.
Cubic gallons per minute
- 5.Which physical factor affects the behavior of liquids in both rest and motion?
- A.
Friction, applied forces, and gravity
- B.
Friction, inertia, and atmospheric pressure
- C.
Gravity, atmospheric pressure, and inertia
- D.
Gravity, atmospheric pressure, and applied forces
- 6.What determines the intensity of the excess pressure in a water-hammer wave?
- A.
The size of the pipe
- B.
The specific gravity of the fuel
- C.
The change in gallons per minute
- D.
The amount of extinguished velocity
- 7.Which type of measurement may be used to express pressure?
- A.
Kilograms
- B.
Pounds
- C.
Tons
- D.
Pounds per square inch
- 8.The standard measure for atmospheric pressure is equal to how many pounds per square inch?
- A.
13.1 psi
- B.
14.7 psi
- C.
15.2 psi
- D.
17.0 psi
- 9.What type of pressure reading is also referred to as overpressure?
- A.
Zero pressure
- B.
Gauge pressure
- C.
Absolute pressure
- D.
Atmospheric pressure
- 10.What term is used to describe the total pressure acting as a gas?
- A.
Overpressure
- B.
Gauge pressure
- C.
Absolute pressure
- D.
Atmospheric pressure
- 11.Which temperature scale is commonly used for scientific measurements?
- A.
Kelvin scale
- B.
Rankine scale
- C.
Reaumur scale
- D.
Fahrenheit scale
- 12.Which gas law declares that cooling a gas decreases its volume?
- A.
Boyle’s law
- B.
Charles’ law
- C.
Dalton’s law
- D.
Gay-Lussac’s law
- 13.Two or more atoms combined is called a
- A.
A compound
- B.
An element
- C.
A molecule
- D.
A mixture
- 14.According to the electron theory, atoms are composed of
- A.
Protons, neutrons, and electrons
- B.
Neutrons, elements, and protons
- C.
Electrons, molecules, and elements
- D.
Electrons, neutrons, and matter
- 15.How do the charges of protons and electrons differ?
- A.
Protons have positive charges, and electrons have neutral charges
- B.
Protons have neutral charges, and electrons have positive charges
- C.
Protons have negative charges, and electrons have positive charges
- D.
Protons have positive charges, and electrons have negative charges
- 16.The uniform movement of electrons in a specific direction is called
- A.
Electrical potential
- B.
Free electrons
- C.
Electric current
- D.
Ionization
- 17.Which shell of the valence electrons determines whether a material is a good or a poor conductor of electricity?
- A.
The outermost shell
- B.
The middle shell
- C.
The second shell
- D.
The first shell
- 18.Which statement best describes a positive ion?
- A.
An atom that lost a proton and has more electrons
- B.
An atom that lost an electron and has more protons
- C.
An atom that has an equal number of electrons and protons
- D.
An atom that cannot throw off any protons
- 19.What effect of current causes an electric motor to produce mechanical energy?
- A.
Heat
- B.
Magnetism
- C.
Chemical
- D.
Reactance
- 20.What is the unit of measurement of electrical power?
- A.
Watts
- B.
Volts
- C.
Amps
- D.
Ohms
- 21.A 3-hoursepower motor consumes how much power?
- A.
755 W
- B.
1,534 W
- C.
2,023 W
- D.
2,238 W
- 22.A magnet that is magnetized by induction from an external source is called?
- A.
A natural magnet
- B.
An electromagnet
- C.
An artificial magnet
- D.
An electromechanical magnet
- 23.When do the magnetic lines of force in a magnet cross?
- A.
When the north pole of a magnet is placed near the north pole of another magnet.
- B.
When the south pole of a magnet is placed near the north pole of another magnet.
- C.
When a permanent magnet and a temporary magnet are put together.
- D.
Magnetic lines of force never cross each other.
- 24.What are the two most common methods of producing voltage?
- A.
Magnetic and heat
- B.
Chemical and heat
- C.
Chemical and mechanical
- D.
Magnetic and mechanical
- 25.What type of current flow is the result of voltages produced by batteries and thermocouples?
- A.
Open current
- B.
Direct current
- C.
Latent current
- D.
Alternating current
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