# Ure 2F071 Pretest

100 Questions | Total Attempts: 778

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CDC 2F071Volumes I, II, III UREs

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• 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