COMPETENCE 7

50問 • 4ヶ月前

問題一覧

A solid‐state circuit is inoperative; the first action that should be taken is to_______.

check the DC supply voltage

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______

reheat connection with a soldering tool and recheck with an ohmmeter

When a nickel‐cadmium battery begins gassing while connected to the battery charging circuit, you should____.

do nothing as this is a normal condition when charging

Four lamps are connected in parallel in a single circuit. If one of the lamp burns out, the others will _____.

burn with their original intensities

When charging lead‐acid batteries the charging rate should be reduced as the battery nears its full charge to ____.

prevent damaging battery plates

If you disconnect and arrange both ends of a three conductor cable, without any contact between the individual conductors. A low ohmic value betweenb the ends of a single conductor would indicate _____.

continuity of the conductor

The proper way to apply plastic electrical tape to an electric cable splice is to______.

wind the tape so that each turn overlaps the turn before it

If violent gassing occurs when a lead‐acid storage battery is first placed on charge, the ____.

charging rate is too high

When a lead‐acid battery begins gassing freely whilereceiving a normal charge, the charging should ____

be decreased

Maintenance of alkaline batteries should include_____.

making certain connections are tight and clean

Air gap readings should be periodically taken for electrical generation equipment. The best tool to use to take these measurements is a ____.

tapered, long blade gage

Which of the following statements is true concerning the cleaning of electrical contacts?

Delicate parts should be cleaned with a brush and an approved safety solvent.

Air gap readings should be taken periodically on electrical generation equipment to ___.

determine the condition of the bearings

Which of the following statements best describes the material known as varnished cambric?

Cotton cloth coated with insulating varnish.

Which of the following methods should be used to dress the face of silver‐plated contacts?

A. Sanding with 0000 sandpaper

Which of the following materials is recommended for finishing the slip rings after grinding or turning?

crocus cloth

If a small motor has been immersed in salt water, it should be ___. I. Thoroughly rinsed in fresh water and completely dried II. Initially started with reduced voltage

both I and II

When shipboard electrical distribution circuits are connected in parallel, additional parallel circuits will cause the total circuit resistance to ____.

decrease, causing an increase in the line current

Which of the following problems is indicated if lead‐acid battery begins to gas violently when it is first placed on charge?

An excessive charging rate is being applied to the battery

When a replacing a fuse with one of a higher rating than the original, which of the following is true?

It endangers the apparatus it is supposed to protect

If an alternator is to be inactive for a considerable period of time, which of the following action should be taken?

The brushed should be lifted off the slip rings to prevent pitting of the metal by electrolytic action

Proper storage battery maintenance includes ____.

keeping connections light and casing surface clean

When a nickel‐cadmium battery begins gassing while connected to the battery charging circuit, you should____.

do nothing as this is a normal condition when charging

Four lamps are connected in parallel in a single circuit. If one of the lamp burns out, the others will _____.

burn with their original intensities

When charging lead‐acid batteries the charging rate should be reduced as the battery nears its full charge to ____.

prevent damaging battery plates

If you disconnect and arrange both ends of a three conductor cable, without any contact between the individual conductors. A low ohmic value between the ends of a single conductor would indicate _____.

continuity of the conductor

The proper way to apply plastic electrical tape to an electric cable splice is to______.

wind the tape so that each turn overlaps the turn before it

Regarding battery charging rooms, ventilation should be provided __________.

at the highest point of the room

If violent gassing occurs when a lead‐acid storage battery is first placed on charge, the ____.

charging rate is too high

When a lead‐acid battery begins gassing freely while receiving a normal charge, the charging should ____

be decreased

Maintenance of alkaline batteries should include_____.

making certain connections are tight and clean

Air gap readings should be periodically taken for electrical generation equipment. The best tool to use to take these measurements is a ____.

tapered, long blade gage

Which of the following statements is true concerning the cleaning of electrical contacts?

Delicate parts should be cleaned with a brush and an approved safety solvent

Air gap readings should be taken periodically on electrical generation equipment to ___.

determine the condition of the bearings

A lead‐acid battery is considered fully charged when the ____.

specific gravity of all cells reaches the correct value and no longer increases over a period of 1 to 4 hours

Which of the following statements best describes the material known as varnished cambric?

Cotton cloth coated with insulating varnish.

Which of the following methods should be used to dress the face of silver‐plated contacts?

Sanding with 0000 sandpaper

Which of the following materials is recommended for finishing the slip rings after grinding or turning?

crocus cloth

Air gap readings should be taken on electrical generation machinery periodically to ___. I. determine the need for cleaning II. check the condition of the bearings

both I and II

If a small motor has been immersed in salt water, it should be ___. I. Thoroughly rinsed in fresh water and completely dried II. Initially started with reduced voltage

both I and II

When shipboard electrical distribution circuits are connected in parallel, additional parallel circuits will cause the total circuit resistance to ____.

decrease, causing an increase in the line current

Which of the following problems is indicated if lead‐acid battery begins to gas violently when it is first placed on charge?

An excessive charging rate is being applied to the battery

When a replacing a fuse with one of a higher rating than the original, which of the following is true?

It endangers the apparatus it is supposed to protect

If an alternator is to be inactive for a considerable period of time, which of the following action should be taken?

The brushed should be lifted off the slip rings to prevent pitting of the metal by electrolytic action

Proper storage battery maintenance includes ____.

keeping connections light and casing surface clean

A common type of protective covering used on electrical conductors is _____________.

fibrous braid

Which of the following statements represents the FIRSTstep in seating new brushes on slip rings?

Lay sandpaper between the brush and the slip ring and slide the sandpaper back and forth under the brush.

Two contributors of electronic console failures are heat and vibration. To combine some of their effect, preventive maintenance procedures should include ____.

periodic changing or cleaning of console ventilation and control room air conditioning filters

The removal of paint from electrical equipment such as generators, should be cautiously undertaken because ____.

the paint dust is composed of abrasive and semi‐conducting materials which impair insulation

When mixing electrolyte, which if the following precautions should always be observed?

Add the acid to the water

Competence 1

Emm · 112問 · 4ヶ月前

Competence 1