Engineering study guide

schematic

A _ is a diagram of a system that uses graphic symbols to represent pneumatic, hydraulic, or electrical components

cantilever

A _ is a stuctural member which projects beyond its suport and is supported at only one end

pascal's

According to _ law, when a pressure or a force is applied to confined liquid, that force is transmitted to all parts of the liquid in all directions

deviation

Standard _ (SD) is a measure of the degree of variation from the mean

torsion

_ (also known as torque) is most associated with mechanical systems, such as motors, engines, and the related moving parts

opamps

_ are so named since they were designed to perform arithmetic calculations such as addition and multiplication

anthropometry

_ is the branch of science that deals with human measurement by describing human size, shape, and other physical characterestics

flexible

_ means the design is useful to a wide range of people with different abilities

velocity

__ (VR) is the relationship between the distance moved by the effort and load

resistors

___ are, by far, the most widely used electrical component

newtons laws of motion

___ forms the basis for classical Newtonian mechanics

dead

___ loads include the weight of the materials in the structure itself and all major architectural or product features

force

a _ causes a body (mechanism) to accelerate (move)

false

a bin definition is not necessary for making histogram (t,f)

transistor

a bipolar__ transistors has three leads: the emitter (e), the base (b), and the collector (c)

1

a class _ lever has the fulcrum between the effort and load

oscillating

a clock pendulum and the agitator of a top-loading washing machine move with a(n) _ motion

false

a common material used as an insulator of electricity is copper (t,f)

cylinder

a container with one movable wall is called a pneumatic _

true

a mechanical advantage greater than 1 (MA>1) means that a gain in output force has been achieved by an increase in input motion (t,f)

false

a structural subcomponent using the triangle shape is rarely used in structural design because of its inherent instability (t,f)

square

a very important similarity between gravitational and electric forces is that they are both governed by an inverse _ law

structure

a(n) _ is a body that supports a load and resists external forces without changing its shape, except for that due to the elasticity of the materail(s) used in construction

conductor

a(n) _ is a material that allows the flow of charge (typically, but not always, electrons)

shuttle

a(n) _ valve allows a single-acting cylinder to be controlled from two locations. It is a"I" connector with three ports, two air inlets, and one air outlet

true

all custom products are more expensive than mass-produced products (t,f)

false

all hydraulic fluids are petroleum-based (t,f)

vector

are lines that describe both the direction and magnitude of a force being applied to the system

histogram

as the name implies, a _ is a kind of history of data

bending

beams are primarily designed to resist __ forces

target

designers must first decide on the group of people for which they are designing. This group is known as the__ population

true

double-acting cylinders have the same piston area on both sides, so they can exert equal pressure in both directions (t,f)

false

dynamic loads are characterized by forces at rest (t,f)

false

elements that join pairs together are known as chains (t,f)

freeze

excel provides the ability to "_" a cell, so that Excel will not try to perform iteratively with it

gaussian

if you made a graph of the height of the people you observed, it would most likely look like a _ distribution or normal bell-shaped distribution curve

false

if you want to push or pull an object, the maximum force recommended by NIOSH is 80 lbs (t,f)

absolute

in a(n) _ plot, the real numerical values are used in the plot

rubber

in commercial cylinders, a plastic or __ seal is used to form a tight barrier to prevent fluid from escaping around the piston

henrys

inductance is measured in

work

is a force applied over a distance that overcomes some resistance as noted in Newton's laws

planned obsolescence

is the concious decision on the part of the designer to produce a product that will become outdated in a defined time frame

viscosity

is the resistance of a fluid to flow

binary

it is easy to represent __ numbers, 1s and

true

kinetics studies the action of forces on bodies (t,f)

live

loads include the weight of all occupants in the building as well as things that can be moved, such as furniture

moving

magnetic fields are created by _ charge

suspension

modern__ bridge designs are capable of spanning the greatest distance of all bridge designs

true

no material conducts electric charges perfectly, so een good conductors exhibit some resistance to the flow of charge (t,f)

actuators

output devices that cause movement are called

false

plastic gears are stronger than metal gears, but they are more expensive (t,f)

four

polygons are figures with more than _ angles

false

safety factors should be less than 1(t,f)

eccentric

the __ cam, a circular disk with the axle placed off center, gives a smooth, harmonic, linear output motion to the follower

true

the body is able to exert the most force and is the strongest in the neutral position (t,f)

resistivity

the electrical _ is the mathematical inverse of electrical conductivity

circle

the equation for a _ centered at the origin in Cartesian coordinates is x^2+y^2=R^2

faster rotary

the rack and pinion gear system changes a rotary input to a(n) __ output motion

false

the three-port valce has three positions (t,f)

direction

the two aspects of a vector, length and _, are exactly the important aspects of force

crack

the__ and slider mechanism is used to change between rotary and reciprocating motions

2

there are _pi radians in a circle

false

there are only four basic logic operations: invert, and, or, and nor (t,f)

false

torque is the rotational equivalent to acceleration (t,f)

uniform distributed

when a calculation is to include the weight of the material makig up the structure, as well as loads that may be districuted ocer the entire surface, a(n) __ load (UDL) measure is used

Newton's

when a force is applied to a gas in a container, the force tends to decrease the distance between the molecules _ third law, which describes how each action is accompanied by an equal but opposite reaction, tells us that there must also be a force pushing the molecules away from each other

false

when items in a structure are not moving, the sum of all the forces must equal one (t,f)

90

when using a computer workstation, you should keep your elbows close to your body and bent between__ and 120 degrees

20 to 40

when using a computer, you should keep the monitor between _ inches and directly in front of the user

false

when using a laptop, you should avoid using a wireless keyboard and mouse because of poor ergonomics (t,f)