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.

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.
by

1 Answer

Answer :

Answer: B
by

Related questions

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

Tightly knit metal braid wire can be used with a printed circuit board when ___________. A. conductor flexibility is required B. desoldering components in the circuit C. electrically produced magnetic fluxes would cause inaccuracies in adjacent components D. reactance in the circuit must be kept to a minimum

Description : Tightly knit metal braid wire can be used with a printed circuit board when ___________. A. conductor flexibility is required B. desoldering components in the circuit C. electrically produced magnetic ... cause inaccuracies in adjacent components D. reactance in the circuit must be kept to a minimum

Last Answer : Answer: B

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.

When troubleshooting an electronic circuit, a cold solder joint can be located with the aid of an ohmmeter. Once the problem has been located, you should _________________. A. reheat the circuit in an oven to an even temperature and recheck with an ohmmeter B. reheat the connection with a match and recheck with an ohmmeter C. reheat connection with a soldering tool and recheck with an ohmmeter D. do nothing as this is the normal condition

Description : When troubleshooting an electronic circuit, a cold solder joint can be located with the aid of an ohmmeter. Once the problem has been located, you should _________________. A. reheat the circuit in an ... a soldering tool and recheck with an ohmmeter D. do nothing as this is the normal condition

Last Answer : Answer: C

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

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

The small circular symbols to which wire '52N57E' is connected at coordinates '57L' and '57P' shown in the illustration represent ___________________. EL-0100 A. relay contact solder points B. wire wrap connections C. terminal board screws D. switch contact terminals

Description : The small circular symbols to which wire '52N57E' is connected at coordinates '57L' and '57P' shown in the illustration represent ___________________. EL-0100 A. relay contact solder points B. wire wrap connections C. terminal board screws D. switch contact terminals

Last Answer : Answer: C

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

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.

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

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

Last Answer : Use a skipping pattern

When a console indicating lamp burns out, attempts to renew it should not be made while maneuvering because _______________. A. the new lamp may be of a higher wattage and cause heat damage to the lens B. removing a faulty lamp usually causes an alarm to sound on the bridge C. attention should be paid only to engine orders D. a socket/wiring fault may cause a ground or short circuit to shut down a vital function

Description : When a console indicating lamp burns out, attempts to renew it should not be made while maneuvering because _______________. A. the new lamp may be of a higher wattage and cause heat damage to the lens ... D. a socket/wiring fault may cause a ground or short circuit to shut down a vital function

Last Answer : Answer: D

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

What is the type of solder that would be used in hard soldering?

Description : What is the type of solder that would be used in hard soldering?

Last Answer : Need answer

Which of the following statements describes the significance of ambient temperature in relation to the service life of electronic components? A. Ambient temperature should be as high as possible to drive off moisture. B. Increased ambient temperature decreases the service life of electronic components. C. Ambient temperature is not significant as long as the relative humidity is kept low. D. A reduced ambient temperature causes a corresponding reduced service life.

Description : Which of the following statements describes the significance of ambient temperature in relation to the service life of electronic components? A. Ambient temperature should be as high as possible to drive ... is kept low. D. A reduced ambient temperature causes a corresponding reduced service life.

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

In electronic circuits, DC voltages can be positive (+) or negative (-) when measured with respect to the _________. A. printed circuit board 'common' trace B. chassis, console frame or hull 'ground' C. analogue or digital circuitry 'common' bus D. all of the above

Description : In electronic circuits, DC voltages can be positive (+) or negative (-) when measured with respect to the _________. A. printed circuit board 'common' trace B. chassis, console frame or hull 'ground' C. analogue or digital circuitry 'common' bus D. all of the above

Last Answer : Answer: D

In electronic circuitry, the abbreviation 'PCB' commonly means ______________. A. pulse coded binary B. printed circuit board C. poly-coated braid D. personal computer bits

Description : In electronic circuitry, the abbreviation 'PCB' commonly means ______________. A. pulse coded binary B. printed circuit board C. poly-coated braid D. personal computer bits

Last Answer : Answer: B

The heat dissipating capability of transformers of ratings higher than 30 kVA in increased by providing which of the following ? (a) Corrugations (b) Fins (c) Tubes (d) Radiator tanks (e) All of the above

Description : The heat dissipating capability of transformers of ratings higher than 30 kVA in increased by providing which of the following ? (a) Corrugations (b) Fins (c) Tubes (d) Radiator tanks (e) All of the above

Last Answer : (e) All of the above

The joint for soldering is supported by binding wire made of (A) Mild steel (B) Copper (C) Soft iron (D) Stainless steel

Description : The joint for soldering is supported by binding wire made of (A) Mild steel (B) Copper (C) Soft iron (D) Stainless steel

Last Answer : Option C

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.

A circuit with a blown fuse would be described as a/an _____________. A. short circuit B. open circuit C. bonded circuit D. grounded circuit

Description : A circuit with a blown fuse would be described as a/an _____________. A. short circuit B. open circuit C. bonded circuit D. grounded circuit

Last Answer : Answer: B

Which of the following characteristics is not typical of ionically bonded crystals? (a) Has no sharp melting point (b) Cleave into definite cleavage planes (c) Conducts when melted (d) Shatters when crystal is distorted

Description : Which of the following characteristics is not typical of ionically bonded crystals? (a) Has no sharp melting point (b) Cleave into definite cleavage planes (c) Conducts when melted (d) Shatters when crystal is distorted

Last Answer : Ans:(a)

When replacing component 'B' of the circuit shown in the illustration, it is important to know that ____________. EL-0081 A. it is polarity sensitive and must be inserted as indicated on its base B. there is a danger of phosphor poisoning should 'B''s bulb break C. component 'D' must be closed during the replacement to provide the capacitor's initial charge D. it must match the circuit voltage and component 'C' wattage

Description : When replacing component 'B' of the circuit shown in the illustration, it is important to know that ____________. EL-0081 A. it is polarity sensitive and must be inserted as indicated on its ... provide the capacitor's initial charge D. it must match the circuit voltage and component 'C' wattage

Last Answer : Answer: D

In the illustration what is the minimum wattage needed for a 3 ohm resistor with a 12 VDC power source in circuit 'A'? EL-0041 A. 12 watts B. 48 watts C. 64 watts D. 232 watts

Description : In the illustration what is the minimum wattage needed for a 3 ohm resistor with a 12 VDC power source in circuit 'A'? EL-0041 A. 12 watts B. 48 watts C. 64 watts D. 232 watts

Last Answer : Answer: B

When changing out component 'B' of the circuit shown in the illustration, it is important to know that ____________. EL-0081 A. it is polarity sensitive and must be inserted as indicated on its base B. there is a danger of phosphor poisoning should 'B''s bulb break C. component 'D' must be closed during the replacement to provide the capacitor's initial charge D. it must match the circuit voltage and component 'C' wattage

Description : When changing out component 'B' of the circuit shown in the illustration, it is important to know that ____________. EL-0081 A. it is polarity sensitive and must be inserted as indicated on its ... provide the capacitor's initial charge D. it must match the circuit voltage and component 'C' wattage

Last Answer : Answer: D

During the start-up of the circuit shown in the illustration, it is noted that the ends of component 'C' remain lighted but the tube does not illuminate. The cause of this problem is ____________. EL-0081 A. component 'A' is open B. component 'D' is closed C. component 'C' is the wrong wattage D. component 'B' contacts are stuck closed

Description : During the start-up of the circuit shown in the illustration, it is noted that the ends of component 'C' remain lighted but the tube does not illuminate. The cause of this problem is ____________. EL- ... ' is closed C. component 'C' is the wrong wattage D. component 'B' contacts are stuck closed

Last Answer : Answer: D

When troubleshooting a console circuit card which is suspected of being faulty, the first step would be to _____. A. pull the card and measure the value of all resistors B. check for the correct value and polarity of all power connections to the card C. de-energize and pull the card to visually inspect for burned components D. check for continuity of circuit board traces and then the gain of each transistor

Description : When troubleshooting a console circuit card which is suspected of being faulty, the first step would be to _____. A. pull the card and measure the value of all resistors B. check for the ... for burned components D. check for continuity of circuit board traces and then the gain of each transistor

Last Answer : Answer: C

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 capacitor discolored due to excessive heat should be _____________. A. calibrated using a capactance wheatstone bridge B. replaced and the reason for the overheating found C. cooled with a spray can of refrigerant approved for this purpose D. resoldered with care taken to insure that the origional cold solder joint is repaired

Description : A capacitor discolored due to excessive heat should be _____________. A. calibrated using a capactance wheatstone bridge B. replaced and the reason for the overheating found C. cooled with a spray ... purpose D. resoldered with care taken to insure that the origional cold solder joint is repaired

Last Answer : Answer: B

Pick up the constituent of good brick earth whose excess causes the raw bricks shrink and warp during drying and burning, from the following: (A) Alumina (B) Lime (C) Iron-oxide (D) Magnesia

Description : Pick up the constituent of good brick earth whose excess causes the raw bricks shrink and warp during drying and burning, from the following: (A) Alumina (B) Lime (C) Iron-oxide (D) Magnesia

Last Answer : Answer: Option A

What type of service is NOT provided by the circuit shown in the illustration? EL-0094 A. Logging of engine order signals from the bridge. B. Printed record of alarms as they occur. C. Visual metering of temperature and pressure conditions. D. Periodic recording of pressure and temperature conditions.

Description : What type of service is NOT provided by the circuit shown in the illustration? EL-0094 A. Logging of engine order signals from the bridge. B. Printed record of alarms as they ... . Visual metering of temperature and pressure conditions. D. Periodic recording of pressure and temperature conditions.

Last Answer : Answer: A

cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall (a) Direct (b) Indirect (c) Conventional (d) Any ofthe above

Description : cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall (a) Direct (b) Indirect (c) Conventional (d) Any ofthe above

Last Answer : (a) Direct

What is the main printed circuit board of a computer called ?

Last Answer : The main printed circuit board of a computer is called mother board.

PCB stands for: a) Process Control Block b) Printed Circuit Board c) Both of The Above d) None of The Above

Description : PCB stands for: a) Process Control Block b) Printed Circuit Board c) Both of The Above d) None of The Above

Last Answer : c) Both of The Above

Multilayer printed circuit board repair is the responsibility of what 2M repair technician?

Description : Multilayer printed circuit board repair is the responsibility of what 2M repair technician?

Last Answer : Microminiature repair technician.

When does most printed circuit board damage occur?

Description : When does most printed circuit board damage occur?

Last Answer : During disassembly or repair.

Name the three methods of interconnecting components in multilayer printed circuit boards.

Description : Name the three methods of interconnecting components in multilayer printed circuit boards.

Last Answer : Clearance hole, plated-through hole, and layer build-up

When troubleshooting electronic equipment, you should use a high impedance multimeter ________________. A. to prevent excess current flow through the meter that would damage it B. for AC measurements only and a low resistance meter for DC measurements C. whenever a low impedance meter is not available, regardless of the components being tested D. so as not to load down the circuit and obtain erroneous voltage readings

Description : When troubleshooting electronic equipment, you should use a high impedance multimeter ________________. A. to prevent excess current flow through the meter that would damage it B. for AC measurements only ... being tested D. so as not to load down the circuit and obtain erroneous voltage readings

Last Answer : Answer: D

What procedure involves the use of finely braided copper wire to remove solder?

Description : What procedure involves the use of finely braided copper wire to remove solder?

Last Answer : Wicking.

Why should wire be stripped 1/32 inch longer than the depth of the solder barrel?

Description : Why should wire be stripped 1/32 inch longer than the depth of the solder barrel?

Last Answer : To prevent burning the insulation during the soldering process and to allow the wire to flex easier at a stress point.

What are the components of solder?

Description : What are the components of solder?

Last Answer : tin and lead

Ties between members of households loosened in Britain in the era of industrialization. -SST 10th

Description : Ties between members of households loosened in Britain in the era of industrialization. -SST 10th

Last Answer : In the 18th century, the family had been a unit of production and consumption as well as of political decision-making. There was a big change in the newer pattern. (i) Ties between members of ... by experience of the war time and partly work done by the women who were employed in large numbers.

How many nos. of sleepers should be loosened either side of the proposed weld? (i) 3 sleepers (ii) 5 sleepers.* (iii) 2 sleepers (iv) 4 sleepers

Description : How many nos. of sleepers should be loosened either side of the proposed weld? (i) 3 sleepers (ii) 5 sleepers.* (iii) 2 sleepers (iv) 4 sleepers

Last Answer : (ii) 5 sleepers.

The material used for a fuse wire should have (a) high resistivity (b) high ductility (c) high melting point (d) low melting point

Description : The material used for a fuse wire should have (a) high resistivity (b) high ductility (c) high melting point (d) low melting point

Last Answer : Ans:(d)

A Fuse wire is characterized by – (1) High resistance and low melting point (2) High resistance and high melting point (3) Low resistance and high melting point (4) Low resistance and low melting point

Description : A Fuse wire is characterized by – (1) High resistance and low melting point (2) High resistance and high melting point (3) Low resistance and high melting point (4) Low resistance and low melting point

Last Answer : (4) Low resistance and low melting point Explanation: A fuse is a type of low resistance resistor that acts as a sacrificial device to provide over current protection, of either the load or source ... melt if a current more than the safe current for the appliance starts flowing through the circuit.