Mechanical Engineering Quiz # 3

Which is the most common stress used to evaluate the yielding of ductile materials?

Shear Stress

Principle Stress

Von Mises Stress

Coulomb-Mohr

What is the term for the cutting process where the tool and cutting surface are perpendicular to each other?

Orthogonal cutting

Diagonal cutting

Perpendicular cutting

Side cutting

Which of these is a method used to evaluate new product ideas?

CAD simulation

SWOT analysis

MATLAB simulatioin

Place these in the correct order for torsion: T,L,J,theta

JL/Ttheta

TL/Jtheta

Ltheta/JT

Approximately how much does one gallon of water weigh?

.433 lbs

16.24 lbs

64 lbs

8.33 lbs

What is the maximum allowable working pressure for a low pressure steam boiler?

5 psi

50 psi

15 psi

1 psi

How do we describe the process for determining the magnitudes of the components of a vector directed in two dimensions?

Vector Resolution

Vector Assesment

Vector calculus

Vector Calculation

Which law of thermodynamics captures the idea that higher temperature materials will always gravitate toward cooler temperatures?

The second law of Thermodynamics

The third law of Thermodynamics

The first law of Thermodynamics

The fourth law of Thermodyamics

What is the force that prevents a material from being torn apart?

Adhesive strength

Tensile strength

Shear strength

Cohesive strength

According to Newton's first law, if the vector sum of all forces acting on a body is zero, then its:

acceleration is constant

velocity is zero

velocity is constant

What is the name of the 3 valve configuration designed to continuously vent unwanted fuel away from it's point of use?

Block and bleed

Closed and vented

Stop and block

Normally open normally closed

What are the units for a moment of inertia?

radians per second

kg/m^2

kg.m^2

Newton meter

True or False: The force needed to extend a spring by a certain distance is inversely proportional to that distance.

False

True

According to Bernoulli's principle, what happens in an ideal fluid with a decrease in pressure?

increase in speed

increase in volume

decrease in speed

What quality should shock resisting steel posses?

High Ductility

High Toughness

High Hardness

High Stiffness

High Shear Strength

Cooling tons are calculated as the amount of heat energy needed to turn one ton of ice into water over what time period?

1 hour

24 hours

8 hours

12 hours

What two fuel types are commonly incorporated into dual fuel burner design?

Propane and natural gas

Coal and wood

Natural gas and fuel oil

Gasoline and fuel oil

What machinability rating has the American Iron and Steel Institute (AISI) given to AISI No. 1112 carbon steel?

0%

50%

100%

25%

What type of fuel oil pump will deliver consistent pressure and volume with minimal fluctuations to combustion eqiupment?

A positive displacement pump

A single stage centrifugal pump

A multi-stage centrifugal pump

A recriprocating pump

A four bar linkage system meets the Grashof condition if:

The shortest link can rotate fully with respect to a neighboring link.

The crank length is greater than the rocker length.

The mechanism contains more than one degree of freedom.

The coupler curve follows a symmetrical path.

In a heat exchanger application, what value does the term "temperature delta" refer to?

The resultant temperture of the heat exchange process

The heat energy lost through system operation

The difference in temperature between supply and return on one side of the system

The difference in temperature between the two sides exchanging heat energy

Cogeneration commonly combines the production of what two forms of energy?

Electricity and Steam

Steam and Gas

Gas and Electricity

Heating and Cooling

A Mohr's circle reduces to a point when the body is subjected to which of the following conditions?

Equal and opposite axial stress on two mutually perpendicular planes, the planes being free of shear

Pure shear

Equal axial stress on two mutually perpendicular planes, the planes being free of shear

Uniaxial stress only

Doubling the thickness of a rectangular cantilever beam will do what to the stiffness?

The beam becomes 8x stiffer.

The beam becomes 6x stiffer.

The beam becomes 4x stiffer.

The beam becomes 2x stiffer.

Water can be raised in temperature by means of what type of energy?

Sensible heat

Superheat

Latent heat

Thermodynamic energy

In relation to O-Ring sealing, what are back up seals.

A second O-Ring seal to provide redundancy against failure

O-Rings made with special tolerances

O-Rings made from HNBR material to prevent failure

Additional rings which help prevent O-Ring extrusion

What is the ratio of the molar volume of a gas to the molar volume of an ideal gas at the same temperature and pressure?

Compressibility factor

volume factor

ideal ratio

Boyle's ratio

Which thermodynamic cycle is ideally isobaric?

Boyle's cycle

Brayton cycle

Rankine cycle

For a completely isolated system, what is the entropy at thermodynamic equilibrium?

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maximum

minimum

When dimensioning drawings with Inches which of these is the correct format?

0.05±0.01

0.05±.01

.05±0.01

.05±.01