UPDATEDFINALNOCTICEXAM
what is the relationship between guage pressure and absolute pressure
gp=(ap)-(atmospheric p)
why is evaluation an important step in the design process
helps determine if design valid
just in time material system controls
productivity
best use for chasing die
recut damaged threads
in fluid systems, fluid encounters more ________ when it travels long distances
resistance
When measuring current the meter should be connected in
series
electronic inverter
DC to AC
when testing with compressed air, caution should be given to
PSI monitor
Sprockets
gear wheels on a bicycle
Distance Advantage
Back wheel turns faster than the chain wheel
Energy
Capacity to do work.
Force
A strength, power, or effort that causes movement of a body or other effects.
Gear Ratio
Input Gear Teeth / Output Gear Teeth
the flow through a control valve will increase with an increased
Orifice or throat size
Input Speed
Output speed / Gear Ratio
What is compressed air units? Which should be given most caution too?
Pascal; It is compressed air so it is dangerous to point near your body.
Power Equation:
= I * V, where P represents power in watts, I represents current in amperes, and V represents voltage in volts.
Bevel Gear
A gear in which the axis or shaft of the driving wheel forms an angle with the shaft of the wheel driven.
Idle Gear
A gear that is inserted into a mechanism that neither increases nor decreases the mechanical advantage but reverses the direction of motion.
Force Advantage
Chain wheel turns faster than the rear wheel
Force Equation:
F = m * a, where F represents force in Newtons, m represents mass in kilograms, and a represents acceleration in meters per second squared.
relationship of force, pressure and area in air cylinder
F=PxA
Chain wheel
Front gears of the bicycle
progression of project may be displayed as a chart using horizantal bar graph indicating that time and tast. this utilizes
Gantt chart
Output Speed
Input Speed x Gear Ratio
Driving Gear
The gear that is providing the force to produce motion.
Driven Gear
The gear that is receiving the force to produce motion.
Mechanism
The working parts of a machine or any system that consists of interrelated parts.
Rack & Pinion
The working parts of a machine or any system that consists of interrelated parts.
Crown & Pinion
These gears make changes in the direction of rotational motion typically at a 90-degree angle. They can also change speed and torque of the rotational motion and are commonly found on automobile drive trains.
Ohm's Law:
V = I * R, where V represents voltage in volts, I represents current in amperes, and R represents resistance in ohms
Work Equation:
W = F * d * cos(theta), where W represents work in joules, F represents force in Newtons, d represents displacement in meters, and theta represents the angle between the force and displacement vectors.
40ohm and 60ohm resistors are in parallel with an unknown resistor. If Req=20 ohm the unknown
120
atmospheric pressure at sea level is
14.7 psi
How many ports are there in a two way valve?
2
a speed reducing system has a 2 to 1 ratio
200 rpm to 100 rpm
If a speed reducing system (belt, chain, gears, and etc) has a reduction of 2 to 1, then if
200 volts are input, 100 volts will be output
how many parts on a 2 way valve
3
install 3 way valve, A and B should connect to
exhaust port
what can happen when oil and compressed oxygen and mixed
explosion or fire
training on ____ is given to comply with OSHA in the workplace
fasteners
High Gear
for pedalling downhill, use the largest front sprocket and the smallest rear sprocket
Low Gear
for pedalling uphill, use the smallest front sprocket and the largest rear sprocket
Abrasive cut off saws penetrate materials by grinding which makes them valuable for cutting
hardened materials
setting ammeter, set range switch at
highest
which generates pictorial drawing
isometric
procedure requires use of ______ with an oxygen or acetylene regulator
light oil
circuit breakers are wired in ________ with load
series
The technician should use a Vertical Mill to cut a keyway in a
shaft
Calculate the resulting downtime if there is $5,000 cost production, $1,000 in spare parts used, $1,500 in re-start up cost, $5,000 in lost energy cost and $1,000 in depreciation costs.
7,000
Begins 30 deg. Celsius, ends 212 deg Farenheit. what is the temperature difference
70 c
Efficiency: Efficiency
(Useful Output Energy / Input Energy) * 100%, where efficiency is expressed as a percentage.
how much heat is needed to raise a 1 lb of water 1 degree
1 BTU
Typical gas pressure gauges read what at atmospheric pressure?
1 atm
The amount of heat required to raise the temperature one pound of water by one degree Fahrenheit is
1 calorie
there are _______ degrees seperation on the celcius scale betweeen freezing and boiling water
100
shaft turning 1000rpm has 10 in sprocket connected by roller chain to a 10 in sprocket. How fast does the driven shaft turn
1000rpm
binary form of 192
11000000
one side of sheet metal is 3ft, other side is 2ft. The angle between to two is 90 degrees, how long is the diagnol
3.6 ft
Based On 242 work days, which are 8 hours long how much time can we save if we same 10 minutes each day?
322.66 min
103F to C
39.4
22mm long and 2cm wide, what is area
4.4cm
gear a=40 teeth and rotates at 100 rpm, b= 80 teeth, rpm of B driven by A is
50
Simple Gear Train
This is basically made up of wheels that have teeth cut around their circumference. Gears work on the principle of a lever. When power turns one gear, its teeth in turn force the next gear to move, and so forth. The gear connected to the power source is called the drive gear.
Any material that reduces the amount of heat transfer is called an _________ insulator.
maintain a steady voltage
when assembling a circuit board _______ is used to identify parts
material match software
21 C outside, 23 inside with AC on. Which direction will heat flow
no flow because of insulation
drawing method is used to generate 2d multiview drawing
orthographic
first man credited with powered, sustained and controlled flight is
orville wright
The first requirement for prototype development is to :
plan
what is the formula for force output of hydraulic cylinder
pressure x area
Linear
Made up by or in the form of straight lines.
Worm & Wheel
Makes changes in the direction of rotational motion. They can also change the speed and torque of the rotational motion.
Power (Mechanical) Equation:
P = W / t, where P represents power in watts, W represents work in joules, and t represents time in seconds.
equation for basic unit of electrical power (watt)
P=I^2R
Interconnecting Gears
Rotate in opposite directions
Chain transmission gears
Rotate in the same direction
Acceleration Equation:
a = (v_f - v_i) / t, where a represents acceleration in meters per second squared, v_f represents final velocity, v_i represents initial velocity, and t represents time in seconds.
the _______ has established rules/standards of conduct in codes ethics for engineers, which governs the profession
accreditation board of fundamental canons
gas cylinder at work station, as saftey precaution it should be
chained to rigid item
Thread call of 3/4 - 12 UNF 2B, the 2 stands for
class of thread
which affect strength of material
corrosion
A photo detector converts light to a
current
maintaining assembly and fab. process by gathering data and samples to evaluate variations in process
data process control
civil engineer
deal with surveying
in a simple DC circuit, that has constant voltage, as resistance increases, the current will:
decrease
first requirement for prototype design is
develop a plan
properties of common _________ materials are divided into the following : physical, mechanical, thermal and acoustic
solid
the current of a circuit wired in series is
sum of all parts
Steel reinforcing bars are added to concrete to resist the force of
tension
because switches can fail after opening a disconnect, the safest practice is to
test control circuit
Increasing a flowing liquids viscosity or friction or changing flow direction will result in what?
the pressure of the fluids increase
what does the R-Value on insulation represent
thermal resistance
junction of 2 dissimilar metals that produces voltages proportional to heat
thermocouple
The primary function of fuses in a circuit should be....
to prevent overcurrent
insulated box, constant temp 100F outside temp 50F
transfer equally through all sides
Velocity Equation:
v = d / t, where v represents velocity in meters per second, d represents displacement in meters, and t represents time in seconds
rheostat is a type of
variable resistor
use ___________ to measure existing parts and make dimensions
vernier calipers
the nameplate on a motor is important because it specifies ________ at which may have been operated
voltage
