IME 156 Lab Final

In Eagle, the Blue lines initially in Layout editor represent the final physical connections (copper traces on a PWB). (TRUE/FALSE)

False

In Eagle, the term 'pattern' is most commonly used to describe the physical dimensions of a PCB component. (TRUE/FALSE)

False

The electronic indicator of the press brake is always set to the correct location for your operation so that you never need to adjust or measure the value (True/False)?

False

Several operations must be completed within a reasonably tight tolerance to produce nicely fitting top and bottom chassis pieces. If a make a mistake is made, according to the video, what option do have? a)Start over from scratch with new sheet metal from our unlimited supply. b)Ask someone to sell theirs to you. c)Since metal is ductile, it can usually be re-worked satisfactorily.

Since metal is ductile, it can usually be re-worked satisfactorily.

Deburring sharp edges, corners and holes in sheet metal helps prevent injuries. (True/False)

True

Heat sinks should be attached to LM350 voltage regulators using #6 screw, #6 hex nut and star lock washers. (TRUE/FALSE)

True

All component bodies should be reasonably close, but resistors should be within _______ of the PCB surface for maximum points. a)1 millimeter b)'close enough for government work' c)1 centimeter d)1 kilometer

a)1 millimeter

In Eagle, what are the straight, colored lines initially connecting the devices in the layout referred to as? a)Air wires b)Traces c)Ratsnest d)Net connections

a)Air wires

Which of the following is/are a step for a PCB Layout design with Eagle? a)both choices b)checking design rules after routing traces c)Neither choice d)device placement

a)Both choices

Polarized capacitors usually have what two features that indicate polarity? a)Both these features indicate polarity. b)A longer lead which indicates the positive (anode). c)A negative stripe along the body near the cathode lead.

a)Both these features indicate polarity.

When selecting a location to solder where flux and fumes are emitted: a)Conduct soldering work in a well-ventilated space. Soldering operations should be performed outside, or in a garage, or with small fan blowing fumes away from you. b)Find a small room or closet so that friends and family don't have to smell the fumes c)In a self isolation area to prevent the spread of COVID-19

a)Conduct soldering work in a well-ventilated space. Soldering operations should be performed outside, or in a garage, or with small fan blowing fumes away from you.

Safety protocol when performing operations using tools that are shared with others requires which of the following. a)Each user must wipe down tool surfaces contacted by hand with paper towels moistened with isopropyl alcohol or disinfecting wipes to render safe for the next user. b)Safety protocols such as disinfecting tools, are only required if you have a fever or cough. c)Tools will be thoroughly wiped down/disinfected at the end of lab period; no other disinfecting is required. d)Transmission via touching contaminated surfaces is deemed to be low risk if nobody touches their face; therefore wiping down tools is optional.

a)Each user must wipe down tool surfaces contacted by hand with paper towels moistened with isopropyl alcohol or disinfecting wipes to render safe for the next user.

In Eagle, the physical dimensions of circuit components are specified in ____________ editor. a)Footprint b)Layout c)Device d)Component

a)Footprint

Where should you throw away lead solder debris and dross? a)In a sealed container labeled "Lead Waste", where it will be property disposed as hazardous waste. b)Lead may be toxic, but it is OK to throw in a normal waste bin. c)Lead may be toxic, but it is OK to throw into your recycling bin. d)Collect the lead so it can be melted into fishing weights later.

a)In a sealed container labeled "Lead Waste", where it will be property disposed as hazardous waste.

Which components MUST be inserted and soldered flush to the PCB to work correctly? a)Male headers that engage with Arduino b)voltage regulator IC c)Capacitors d)Resistors

a)Male headers that engage with Arduino

What type of table and flooring should you work on? a)Nonflammable surface that is not easily ignited. A ceramic tile or similar surface is preferred. b)A wood or wicker type surface is preferred since it looks nice in your home. c)While at the gym doing yoga d)A TV dinner tray, so you can relax on your couch while soldering.

a)Nonflammable surface that is not easily ignited. A ceramic tile or similar surface is preferred.

If you cut your finger on a sharp edge of metal, don't feel well, or experience any other type of injury, you should: a)Notify someone in your household immediately. Then when time permits, notify your instructor for further suggestions. b)Ask a Teaching Assistant (TA) who is on the Zoom call. c)Continue to work as though the injury never happened. d)Only notify the instructor if you deem the injury as serious.

a)Notify someone in your household immediately. Then when time permits, notify your instructor for further suggestions.

The soldering iron tip should be in contact with surfaces to be soldered for how long? a)only long enough for the solder to melt, then the iron tip should be immediately removed b)after the flames are extinguished c)until the trace lifts d)30 seconds after solder melts

a)only long enough for the solder to melt, then the iron tip should be immediately removed

What length of wire insulation is stripped off to prepare for crimping? a)1/2 inch b)1/8 inch c)it doesn't really matter d)1/4 inch

b)1/8 inch

What tool can be used to remove flux residue "glassy puddles"? a)scratch awl b)All choices c)isopropyl alcohol w/ acid brush & cotton or paper towels d)exacto-knife

b)All choices

What is the policy for food and drinks in your work area? a)Food & drinks are allowed in your work area if you're careful not to spill or get crumbs on the keyboards, tables or floors. b)Food and drinks are not allowed in your work area to keep all areas and equipment clean and available for working. Accidental ingestion of lead is a hazard and neurotoxin. c)Food is allowed if you bring enough to share with your friends. d)Food is allowed since mice and rats may be attracted and we wish to share the space with natural creatures.

b)Food and drinks are not allowed in your work area to keep all areas and equipment clean and available for working. Accidental ingestion of lead is a hazard and neurotoxin.

Which features are created with the pneumatic punch? a)1-1/4 inch diameter holes b)Four side notches c)90 degree bends d)3/16 inch diameter holes

b)Four side notches

What is a footprint in Eagle software? a)It defines the electrical function of the circuit component. b)It defines the physical dimensions of the circuit component and locates for pads or through-holes. c)It is used to create a wiring diagram or schematic for the circuit components.

b)It defines the physical dimensions of the circuit component and locates for pads or through-holes.

Working in the lab with unrestrained long hair or loose hoodie ties is ___________________________________. a)Okay, if you don't mind hot solder and debris in your long hair. b)Not a good idea because long hair and clothing can be caught in a rotating drill, circuit board or other items you're working on. c)Is safe if long hair is combed neatly or if the hoodie is super cool. d)Long hair is safe if it's colored bright orange.

b)Not a good idea because long hair and clothing can be caught in a rotating drill, circuit board or other items you're working on.

This tool removes a thin strip from the top sheet to allow for an attractive fit between top and bottom chassis pieces: a)Hand file b)Power shear c)Press brake d)Hack saw

b)Power shear

An electrical schematic is best described as a/an: a)component's physical dimensions. b)electrical circuit diagram using symbols. c)PWB Layout design. d)software code.

b)electrical circuit diagram using symbols.

Which component must be inserted flush (1 mm) to the PCB to receive maximum points? a)voltage regulator b)resistor c)All choices d)small disc-shaped capacitor

b)resistor

The following is likely to happen if you overheat a PCB trace or pad. a)the solder will flow more evenly b)the trace will lift off the board substrate c)the solder will only flow to the lead, not the trace d)None of the choices

b)the trace will lift off the board substrate

The soldering iron tip should contact which of the following during soldering? a)solder pad b)board substrate (nonconductive material of PCB) c)Both choices b & c d)lead

c)Both choices b & c

This tool is used make indentations at the center cross-hairs for each hole to be punched out later? a)Chisel b)Screw driver c)Center punch d)Exacto knife

c)Center punch

Circuit symbols are attached to their physical patterns in __________________. a)Device icon b)Schematic c)Component editor d)Layout

c)Component editor

What must you do before sending the board to a manufacturer? a)Print to PDF. b)Save to CSV file. c)Export with the CAM processor. d)Unzip the Eagle folder.

c)Export with the CAM processor.

Step-by-step instructions for Prism sheet metal chassis construction are: a)Printed as a .pdf that you will refer to from your phone or tablet while working. b)Printed in a bound, multi-page instruction booklet. c)Printed on a single sheet with instructions for top piece printed on one side and bottom sheet printed on the other side.

c)Printed on a single sheet with instructions for top piece printed on one side and bottom sheet printed on the other side.

To protect our feet from injury from sharp or heavy objects, what type of footwear must be worn at all times? a)Flats, sandals or flip flops are not fully protective, but may be worn on warm days if they match your outfit. b)Protective, closed-toed shoes are not required on days that you happen to forget about the policy. c)Protective, closed-toed shoes must be worn when working beginning the first day of the Prism LED project. d)Any choice of footwear is acceptable since there are no sharp tools, sheet metal edges or heavy objects in the electronics area.

c)Protective, closed-toed shoes must be worn when working beginning the first day of the Prism LED project.

Tools or equipment may be broken or found to be non-working in the lab. What should you do if you break a tool, find something broken or come across something that seems sketchy or possibly unsafe? a)Depends, if there are no witnesses, hide it, cleverly cover it up, or overtly blame someone else for the negligence if necessary. b)Since we use World War II vintage tools that never wear out, this is a moot question. c)Report unsafe, non-working or broken tools to your instructor or TA promptly. This way they can be repaired or replaced and the entity returned to safe, operating condition.

c)Report unsafe, non-working or broken tools to your instructor or TA promptly. This way they can be repaired or replaced and the entity returned to safe, operating condition.

The punching of various holes for the chassis are completed using the following tools: a)Jig saw b)Band saw c)Single hole punches and the turret punch. d)Hole saws for each of the required sizes.

c)Single hole punches and the turret punch.

What step is necessary before we can begin to create a schematic in Eagle software? a)We must have a Gerber file. b)We must have a design layout. c)We must have a library of components. d)We must perform at ERC check.

c)We must have a library of components.

Wearing eye protection whenever anyone is working(soldering, drilling, working with sheet metal, wire, or electrical components) is extremely important. Which of the following is the best practice for ensuring you are protecting your eyes? a)Wearing safety glasses is necessary only when you notice that someone next to you is actively working on something. b)Wearing eye protection is optional in the lab since all available safety glasses can be a little uncomfortable while getting used to them. c)Wear safety glasses while you or anyone is working in the lab because many activities in the lab can cause injury or blindness in an instant. d)If you don't feel comfortable with the safety glasses you're wearing, occasionally take them off, but continue working carefully.

c)Wear safety glasses while you or anyone is working in the lab because many activities in the lab can cause injury or blindness in an instant.

A solder joint contour should have a _________ shape. a)convex b)wedge c)concave d)ball

c)concave

Only use machines and tools you have been trained in the proper use of and that you are confident with, because: a)We want to learn by doing without risking injury to ourselves or others, or cause damage to the equipment that all students use. b)We get to learn by doing, but also avoid embarrassment by asking to see a demonstration repeated, which will improve our confidence. c)If we injure ourself or another student, or break a critical piece of equipment, this jeopardizes our learn by doing approach to lab work at Cal Poly. d)All of the choices are valid reasons to be trained, and ask questions you may have about tool or equipment operation in the lab.

d)All of the choices are valid reasons to be trained, and ask questions you may have about tool or equipment operation in the lab.

In the event of a serious injury or person in need of immediate medical assistance, what should you do? a)Call 911 b)Tell the 911 operator the location and the nature of the emergency. c)Tell someone in your current location about the emergency. d)All of these are appropriate actions if anyone needs help due to accident or serious illness.

d)All of these are appropriate actions if anyone needs help due to accident or serious illness.

A crimp connection may look okay after crimping, but should be tested for continuity because: a)power may not be getting to your system if either of your crimps in Slot 1 or Slot 2 are faulty. b)crimping process takes a few tries to become proficient. c)Crimps may look correct, but be intermittently failing. d)All of these are true.

d)All of these are true.

Assembling Region 1 only, then testing to verify functionality before proceeding is important because: a)Simplifies troubleshooting if something's awry. b)Provides feedback on the integrity of the assembly so far. c)It's worth points. d)All of these.

d)All of these.

How is personal identification of your chassis pieces is done? a)After the chassis is completed, write your name, quarter and year clearly on the outside surface using black marker pen. b)Name, quarter and year are engraved on both the black and white sides of each chassis piece. c)Personal identification of sheet metal chassis is optional, so is not required. d)Name, quarter and year are engraved on the white side, approximately near one edge of each aluminum piece.

d)Name, quarter and year are engraved on the white side, approximately near one edge of each aluminum piece.

This tool creates bends along various edges of the sheet metal: a)Hand file b)Turret punch c)Pneumatic punch d)Press brake

d)Press brake

When is it recommended to remove flux residue from the PCB? a)never b)after half the total number or solder joints are made c)After each solder joint is made d)after all solder joints are made, but before turning in for inspection

d)after all solder joints are made, but before turning in for inspection

What is wired to the third, side lug of the power jack (if you have one) in the Prism LED project? a)Any green wire b)Earth ground connection c)Any purple wire d)nothing, do not use, it's unnecessary.

d)nothing, do not use, it's unnecessary.

For ease of inspection, place resistors such that their______ bands are oriented on the right. a)multiplier b)None of the choices c)red d)tolerance

d)tolerance

Attach heat-sink to regulator IC after soldering regulator IC to PCB. (TRUE/FALSE)

false

When assembling header pins to a PCB, the long header pins are inserted into the PCB and the short header pins stick out above PCB. (TRUE/FALSE)

false

When removing flux residue with acid brush, isopropyl alcohol and paper towel, apply alcohol to entire board all at once. (TRUE/FALSE)

false

After assembling all the panel mount component wiring and testing Region 1, the space connectors of the on/off switch will require detachment / re-attachment to install in the chassis? (TRUE/FALSE)

true

Capacitors should be reasonably close to the PCB surface, but without excessive strain on the leads. (TRUE/FALSE)

true

For correct power jack wiring, outer lug (+) is crimped to slot 1 and inner lug (-) to slot 2. (TRUE/FALSE)

true

Safety glasses must be worn when working in the lab whether you're soldering, cleaning flux residue or inspecting your project masterpiece. (TRUE/FALSE)

true

Voltage regulator ICs, like transistors are polarized. (TRUE/FALSE)

true

When making a solder joint, never apply solder directly to the soldering iron tip more than momentarily. (TRUE/FALSE)

true