How do you prevent excessive heat buildup on an area of a board when soldering multilead components?

How do you prevent excessive heat buildup on an area of a  board when soldering multilead components?
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1 Answer

Answer :

Use a skipping pattern
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Why is it a poor practice to use a high wattage soldering iron when soldering or desoldering components on a printed circuit board? A. The circuit board will blister and warp. B. The foil wire bonded to the board may come loosened from the board. C. The circuit board has a low melting temperature. D. The solder is kept to a dull heat dissipating finish.

Description : Why is it a poor practice to use a high wattage soldering iron when soldering or desoldering components on a printed circuit board? A. The circuit board will blister and warp. B. The foil wire bonded ... board has a low melting temperature. D. The solder is kept to a dull heat dissipating finish.

Last Answer : Answer: B

A soldering gun should NOT be used on what components?

Description : A soldering gun should NOT be used on what components?

Last Answer : Electronic components, such as resistors, capacitors, and transistors.

When soldering a printed circuit board component, you should be careful to prevent damage by _________. A. quickly heating the joints, using a high wattage iron B. using the soldering iron tip sparingly C. using only acid cord solder D. applying mechanical pressure to the joints being soldered

Description : When soldering a printed circuit board component, you should be careful to prevent damage by _________. A. quickly heating the joints, using a high wattage iron B. using the soldering iron tip sparingly C. using only acid cord solder D. applying mechanical pressure to the joints being soldered

Last Answer : Answer: B

What is the most common source of heat in electronic soldering?

Description : What is the most common source of heat in electronic soldering?

Last Answer : Conductive-type soldering iron.

Which of the procedures listed could result in damaging a transistor beyond repair? A. Applying incorrect polarity to the collector circuit. B. Applying excessive voltage to the input circuit. C. Careless soldering which would overheat the transistor. D. All of the above.

Description : Which of the procedures listed could result in damaging a transistor beyond repair? A. Applying incorrect polarity to the collector circuit. B. Applying excessive voltage to the input circuit. C. Careless soldering which would overheat the transistor. D. All of the above.

Last Answer : Answer: D

A shading coil used in an AC magnetic controller, functions to _____________. A. reduce vibration and noise in the contactor B. prevent flux buildup in the operating coil C. eliminate arcing when the contacts close D. energize the operating coil and 'pull in' the contacts

Description : A shading coil used in an AC magnetic controller, functions to _____________. A. reduce vibration and noise in the contactor B. prevent flux buildup in the operating coil C. eliminate arcing when the contacts close D. energize the operating coil and 'pull in' the contacts

Last Answer : Answer: A

Cells must constantly manage metabolic pathways, and this is often done by balancing specific biochemical reactions within a pathway. For example, the metabolic product of one pathway may block the formation of that specific metabolite at an earlier point in the pathway to prevent a buildup of that specific product. What is this process called?

Description : Cells must constantly manage metabolic pathways, and this is often done by balancing specific biochemical reactions within a pathway. For example, the metabolic product of one pathway may block the formation ... the pathway to prevent a buildup of that specific product. What is this process called?

Last Answer : Feedback inhibition

Why is steel wool NEVER used as an abrasive to clean soldering tools?

Description : Why is steel wool NEVER used as an abrasive to clean soldering tools?

Last Answer : The strands can fall into electrical equipment being worked on and cause short circuits.

What is an advantage of using a resistance soldering iron when soldering wire to a connector?

Description : What is an advantage of using a resistance soldering iron when soldering wire to a connector?

Last Answer : The soldering tips are hot only during the brief period of soldering the connection, thus minimizing the chance of burning the wire insulation or connector inserts.

Why are solvents used in the soldering process?

Description : Why are solvents used in the soldering process?

Last Answer : To remove contaminants from soldered connections.

What type of flux must be used in all electrical and electronic soldering?

Description : What type of flux must be used in all electrical and electronic soldering?

Last Answer : Noncorrosive, nonconductive rosin fluxes.

What purpose does flux serve in the soldering process?

Description : What purpose does flux serve in the soldering process?

Last Answer : It cleans the metal by removing the oxide layer and prevents further oxidation during the soldering

What causes the nuts or screws that hold the tips on soldering irons and guns to loosen?

Description : What causes the nuts or screws that hold the tips on soldering irons and guns to loosen?

Last Answer : The heating and cooling cycles.

What happens if a soldering gun switch is pressed for periods longer than 30 seconds?

Description : What happens if a soldering gun switch is pressed for periods longer than 30 seconds?

Last Answer : It will overheat and could burn the insulation of the wire being soldered.

What should be done to a soldering iron tip that is pitted?

Description : What should be done to a soldering iron tip that is pitted?

Last Answer : File the tip until it is smooth and retin it.

State why a well-designed soldering iron is self-regulating

Description : State why a well-designed soldering iron is self-regulating

Last Answer : The resistance of its heating element increases with rising temperature, thus limiting the current flow.

Why are small-wattage soldering irons not used to solder large conductors?

Description : Why are small-wattage soldering irons not used to solder large conductors?

Last Answer : Although its temperature is as high as the larger irons, it does not have thermal inertia.

What does "tinning" mean in relationship to soldering?

Description : What does "tinning" mean in relationship to soldering?

Last Answer : The coating of the material to be soldered with a light coat of solder.

Why must items to be soldered be cleaned just prior to the soldering process?

Description : Why must items to be soldered be cleaned just prior to the soldering process?

Last Answer : Solder will not adhere to dirty, greasy, or oxidized surfaces.

How should excess solder be removed from a hot soldering iron?

Description : How should excess solder be removed from a hot soldering iron?

Last Answer : By use of a cleaning cloth.

What safety precaution must you observe when soldering or hot-wire stripping fluoroplastic insulated wire?

Description : What safety precaution must you observe when soldering or hot-wire stripping fluoroplastic insulated wire?

Last Answer : Adequate ventilation.

Flux aids in soldering by removing what from surfaces to be soldered?

Description : Flux aids in soldering by removing what from surfaces to be soldered?

Last Answer : Oxides.

In soldering, what alloy changes directly from a solid state to a liquid state?

Description : In soldering, what alloy changes directly from a solid state to a liquid state?

Last Answer : Eutectic.

What determines the shape and size of a soldering iron tip?

Description : What determines the shape and size of a soldering iron tip?

Last Answer : The type of work to be done.

Which type of flux should be used when soldering electrical wire connections and electronic components? A. Silver flux B. Rosin flux C. Solid flux D. Acid flux

Description : Which type of flux should be used when soldering electrical wire connections and electronic components? A. Silver flux B. Rosin flux C. Solid flux D. Acid flux

Last Answer : Answer: B

What is an excessive heat condition?

Description : What is an excessive heat condition?

Last Answer : A condition in which the heat in or around the circuit increases to a higher than normal level

The combustion reactions inside the engine of a rocket cause a buildup of heat and pressure. When this heat and pressure escapes into the atmosphere, what force is created?

Description : The combustion reactions inside the engine of a rocket cause a buildup of heat and pressure. When this heat and pressure escapes into the atmosphere, what force is created?

Last Answer : Thrust (apex)

Use of flux during soldering is done to (A) Increase fluidity of solder by lowering its melting temperature (B) Prevent oxide formation (C) Wash away surplus solder (D) Full up the joint gap

Description : Use of flux during soldering is done to (A) Increase fluidity of solder by lowering its melting temperature (B) Prevent oxide formation (C) Wash away surplus solder (D) Full up the joint gap

Last Answer : (B) Prevent oxide formation

The compound used in prickly-heat powder to prevent excessive sweating is – (1) Boric acid (2) Phosphoric acid (3) Carbonic acid (4) Sulphonic acid

Description : The compound used in prickly-heat powder to prevent excessive sweating is – (1) Boric acid (2) Phosphoric acid (3) Carbonic acid (4) Sulphonic acid

Last Answer : (1) Boric acid Explanation: Boric acid (H3BO3), also called hydrogen borate, boracie acid, orthoboric acid and acidum boricum, is used in prickly heat powders to prevent excessive sweating. Boric ... dressings or salves. As an antibacterial compound, boric acid can also be used for acne treatment.

One of the generator bearing shells is generally insulated from the end housing in order to prevent _____________. A. rapid brush wear B. residual magnetism leak off C. excessive field winding heat D. circulation of shaft currents

Description : One of the generator bearing shells is generally insulated from the end housing in order to prevent _____________. A. rapid brush wear B. residual magnetism leak off C. excessive field winding heat D. circulation of shaft currents

Last Answer : Answer: D

One of the generator or motor bearings is generally insulated from the end housing in order to prevent ________. A. rapid brush wear B. current leakage from the shaft C. excessive field winding heat D. circulation of shaft currents induced in the machine's frame

Description : One of the generator or motor bearings is generally insulated from the end housing in order to prevent ________. A. rapid brush wear B. current leakage from the shaft C. excessive field winding heat D. circulation of shaft currents induced in the machine's frame

Last Answer : Answer: D

The purpose of a heat sink, as frequently used with transistors, is to ____________. A. prevent excessive temperature rise B. compensate for excessive doping C. increase the reverse current D. decrease the forward current

Description : The purpose of a heat sink, as frequently used with transistors, is to ____________. A. prevent excessive temperature rise B. compensate for excessive doping C. increase the reverse current D. decrease the forward current

Last Answer : Answer: A

To avoid damaging the components of a printed circuit board when testing it with a DC volt-ohmmeter, you should _______. A. ground the board B. avoid reversing the polarity of the leads C. isolate sensitive components with heat sinks D. all of the above

Description : To avoid damaging the components of a printed circuit board when testing it with a DC volt-ohmmeter, you should _______. A. ground the board B. avoid reversing the polarity of the leads C. isolate sensitive components with heat sinks D. all of the above

Last Answer : Answer: B

If a delicate component must be soldered into a circuit, the component may be protected from the heat of the soldering process by _____________. A. operating the soldering gun not more than 60 seconds at a time B. using a thermal shunt C. pre-oxidizing the leads to be soldered D. coating the leads to be soldered with a light oil film

Description : If a delicate component must be soldered into a circuit, the component may be protected from the heat of the soldering process by _____________. A. operating the soldering gun not more than 60 seconds at ... oxidizing the leads to be soldered D. coating the leads to be soldered with a light oil film

Last Answer : Answer: B

The proper way to apply plastic electrical tape to an electric cable splice is to _____________. A. apply tape to the braided cover, but avoid touching it B. wind the tape so that each turn overlaps the turn before it C. apply the tape in one non-overlapping layer only D. heat the tape with a soldering iron for good bonding

Description : The proper way to apply plastic electrical tape to an electric cable splice is to _____________. A. apply tape to the braided cover, but avoid touching it B. wind the tape so that each turn overlaps ... tape in one non-overlapping layer only D. heat the tape with a soldering iron for good bonding

Last Answer : Answer: B

Porcelain must not be contaminated by handling between which two stages: A. Pre-soldering and heat treatment B. Heat treatment and opaque /bake/ stages C. Opaque and bisque stages D. Bisque and glazing stages E. First opaque bake and second opaque bake

Description : Porcelain must not be contaminated by handling between which two stages: A. Pre-soldering and heat treatment B. Heat treatment and opaque /bake/ stages C. Opaque and bisque stages D. Bisque and glazing stages E. First opaque bake and second opaque bake

Last Answer : A. Pre-soldering and heat treatment

When a solid-state component of an electronic circuit is mounted to a metallic mass, the general purpose of that mass is to ____________. A. prevent vibration damage to delicate components B. prevent mechanical damage to solid-state components C. dissipate stray magnetic currents D. act as a heat sink

Description : When a solid-state component of an electronic circuit is mounted to a metallic mass, the general purpose of that mass is to ____________. A. prevent vibration damage to delicate components B. prevent ... damage to solid-state components C. dissipate stray magnetic currents D. act as a heat sink

Last Answer : Answer: D

Name the procedure used to reduce excessive arcing in a magnetron?

Description : Name the procedure used to reduce excessive arcing in a magnetron?

Last Answer : Baking in.

How does relative humidity over 95% cause excessive tape and head wear?

Description : How does relative humidity over 95% cause excessive tape and head wear?

Last Answer : High humidity causes increased friction as the tape passes over the heads.

What is an excessive current condition?

Description : What is an excessive current condition?

Last Answer : A condition that is not a direct short but in which circuit current increases beyond the designed current carrying ability of the circuit.

The development of excessive test voltages is avoided by the use of meggers equipped with what device?

Description : The development of excessive test voltages is avoided by the use of meggers equipped with what device?

Last Answer : Friction clutches.

The development of excessive test voltages is avoided by the use of meggers equipped with what device?

Description : The development of excessive test voltages is avoided by the use of meggers equipped with what device?

Last Answer : Friction clutches

Whats the best way to remove Calcium buildup off shower walls?

Description : Whats the best way to remove Calcium buildup off shower walls?

Last Answer : I could swear that I’ve heard somewhere that vinegar was good for removing calcium buildup.

what is the optimal temperature at the base of the stove above a woodstove to avoid creosote buildup.

Description : what is the optimal temperature at the base of the stove above a woodstove to avoid creosote buildup.

Last Answer : answer:The ‘optimal’ temperature, I cannot say. However this eHow describes steps you can take to avoid this problem: http://www.ehow.com/how_4855797_avoid-creosote-buildup-wood-stoves.html They do mention quickly getting the heat to over 220º in step 3. Cheers!

the buildup of electric charge on an object is type of electrsiy?

Description : the buildup of electric charge on an object is type of electrsiy?

Last Answer : Static electricity.

How do I remove wax buildup from hardwooe floors

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What kind of bolts can a buildup of static electricity cause?

Description : What kind of bolts can a buildup of static electricity cause?

Last Answer : Lightning bolts for one. Static electricity builds up, and when sufficient voltage is achieved, the bolt forms.

An open occurring within the field rheostat of an AC generator can be detected by short circuiting its terminals and observing a ____________. A. negative deflection of the wattmeter pointer B. positive deflection of the wattmeter pointer C. buildup of alternator voltage D. low, but constant alternator voltage

Description : An open occurring within the field rheostat of an AC generator can be detected by short circuiting its terminals and observing a ____________. A. negative deflection of the wattmeter pointer B. ... of the wattmeter pointer C. buildup of alternator voltage D. low, but constant alternator voltage

Last Answer : Answer: C

The removal of paint from electrical equipment, such as generators, should be cautiously undertaken because ____________. A. the mechanical shock of paint removal lessens the dielectric strength of the insulation B. the paint dust is composed of abrasive and semi-conducting materials which impair insulation C. paint dust buildup has a tendency to cause corrosion D. phase windings frequently become isolated from each other due to dust interference at the terminals

Description : The removal of paint from electrical equipment, such as generators, should be cautiously undertaken because ____________. A. the mechanical shock of paint removal lessens the dielectric strength ... phase windings frequently become isolated from each other due to dust interference at the terminals

Last Answer : Answer: B