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C7

1A solid‐state circuit is inoperative; the first action that should be taken is to_______.

Wiggle all the components to check for loose connections

Check the DC supply voltage

Check all the resistors

Change all transistors

2When 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______.

Do nothing as this is the normal condition

Reheat the circuit in an oven to an even temperature and recheck with an ohmmeter

Reheat the connection with a match and recheck with an ohmmeter

Reheat connection with a soldering tool and recheck with an ohmmeter

3When a nickel‐cadmium battery begins gassing while connected to the battery charging circuit, you should____.

Add distilled water to each cell to increase the specific gravity of the electrolyte

Do nothing as this is a normal condition when charging

Add potassium hydroxide to each cell to reduce the specific gravity of the electrolyte

Increase the charging rate

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

All go out

Burn with their original intensities

Become dimmer

Become brighter

5When charging lead‐acid batteries the charging rate should be reduced as the battery nears its full charge to ____.

Prevent damaging battery plates

Allow equalization of cell voltages

Reduce lead sulfate deposits

Increase lead peroxide formation

6 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 _____.

An infinite resistance

The presence of a partial ground

That the conductor is not circuit

Continuity of the conductor

7 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

Apply tape to the braided cover, but avoid touching it

Apply the tape in one non ‐overlapping layer only

Heat the tape with a soldering iron for good bonding

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

Battery must be given an emergency charge

Charging rate is too low

Charging rate is too high

Specific gravity of the electrolyte solution is too low

9When a lead‐acid battery begins gassing freely while receiving a normal charge, the charging should ____

Be increased

Remain unchanged

Shut off

Be decreased

10Maintenance of alkaline batteries should include_____.

Top off with sulfuric acid as needed

Making certain connections are tight and clean

Checking the electrolyte weekly using a hydrometer

Replacing the electrolyte every 5 years

11Air gap readings should be periodically taken for electrical generation equipment. The best tool to use to take these measurements is a ____.

Cloth (non‐metallic) tape measure

Dial indicator

Tapered, long blade gage

Inside micrometer

12Which of the following statements is true concerning the cleaning of electrical contacts?

Compressed air should be used to blow out metallic dust.

Magnetic brushes should be used to remove metallic dust.

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

The contact surfaces should be greased to increase contact resistance.

13Air gap readings should be taken periodically on electrical generation equipment to ___.

Determine the condition of the bearings

Determine the amount of varnish that can be applied to correct insulation problems

Provide for the correct proper tightening of the field coil bolts and correct lateral adjustment of the field coils

Increase machine efficiency

14Which of the following statements best describes the material known as varnished cambric?

Cotton cloth coated with insulating varnish.

Felted asbestos sealed with varnish.

Rubber insulation coated with a layer of tin.

Paper impregnated with mineral oil, specially wrapped with nonmetallic tape, and coated with varnish.

15Which of the following methods should be used to dress the face of silver‐plated contacts?

Filing

Sanding with 0000 sandpaper

Burnishing

All of the above are correct.

16Which of the following materials is recommended for finishing the slip rings after grinding or turning?

Grade 00 sandpaper

Canvas wiper

Smooth file

Crocus cloth

17 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

I only

II only

Neither I nor II

18When shipboard electrical distribution circuits are connected in parallel, additional parallel circuits will cause the total circuit resistance to ____.

Increase, causing a drop in the line current

Decrease, causing an increase in the line current

Increase, causing a decrease in the line voltage

Decrease, causing an increase in the line voltage

19Which 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

Insufficient compartment ventilation is being provided

A short circuit exists in one of the battery cells

The battery is undergoing its normal charging rate

20When a replacing a fuse with one of a higher rating than the original, which of the following is true?

It reduces the possibility of short circuits

It endangers the apparatus it is supposed to protect

It increases the efficiency of the equipment by allowing more current to be used

It creates a larger voltage drop in the circuit being protected

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

It should be disconnected from the prime mover and raised off its bearing supports

Insulation resistance readings should be taken weekly to ensure resistance is not deteriorating

The windings and collector rings should be protected with a thin coat of grease or oil

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

22 Proper storage battery maintenance includes ____.

Keeping connections light and casing surface clean

Making sure electrolyte level is below the separator plates

Insulating the terminals with naval jelly

Maintaining a high charging rate at all time

23When 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

Add distilled water to each cell to increase the specific gravity of the electrolyte

Add potassium hydroxide to each cell to reduce the specific gravity of the electrolyte

Increase the charging rate

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

All go out

Become dimmer

Become brighter

_____. Burn with their original intensities

25When charging lead‐acid batteries the charging rate should be reduced as the battery nears its full charge to ____.

Prevent damaging battery plates

Allow equalization of cell voltages

Reduce lead sulfate deposits

26 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

An infinite resistance

The presence of a partial ground

That the conductor is not circuit

27 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

Apply tape to the braided cover, but avoid touching it

Apply the tape in one non ‐overlapping layer only

Heat the tape with a soldering iron for good bonding

28 Regarding battery charging rooms, ventilation should be provided __________.

At the lowest point of the room

Horizontally near the batteries

Only when charging is in progress

At the highest point of the room

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

Battery must be given an emergency charge

Charging rate is too low

Charging rate is too high

Specific gravity of the electrolyte solution is too low

30When a lead‐acid battery begins gassing freely while receiving a normal charge, the charging should ____

Be increased

Remain unchanged

Be decreased

Shut off

31Maintenance of alkaline batteries should include_____.

Checking the electrolyte weekly using a hydrometer

Making certain connections are tight and clean

Replacing the electrolyte every 5 years

Top off with sulfuric acid as needed

32Air gap readings should be periodically taken for electrical generation equipment. The best tool to use to take these measurements is a ____.

Cloth (non‐metallic) tape measure

Tapered, long blade gage

Dial indicator

Inside micrometer

33Which of the following statements is true concerning the cleaning of electrical contacts?

Compressed air should be used to blow out metallic dust.

Magnetic brushes should be used to remove metallic dust.

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

The contact surfaces should be greased to increase contact resistance.

34Air gap readings should be taken periodically on electrical generation equipment to ___.

Determine the condition of the bearings

Determine the amount of varnish that can be applied to correct insulation problems

Provide for the correct proper tightening of the field coil bolts and correct lateral adjustment of the field coils

Increase machine efficiency

35A 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

Electrolyte gasses freely

Battery charger ammeter indicates a positive reading

Terminal voltage reaches a constant value at a given temperature

36Which of the following statements best describes the material known as varnished cambric?

Cotton cloth coated with insulating varnish.

Felted asbestos sealed with varnish.

Rubber insulation coated with a layer of tin.

Paper impregnated with mineral oil, specially wrapped with nonmetallic tape, and coated with varnish.

37Which of the following methods should be used to dress the face of silver‐plated contacts?

Filing

Burnishing

All of the above are correct.

Sanding with 0000 sandpaper

38Which of the following materials is recommended for finishing the slip rings after grinding or turning?

Grade 00 sandpaper

Canvas wiper

Crocus cloth

Smooth file

39Air gap readings should be taken on electrical generation machinery periodically to ___. I. Determine the need for cleaning II. Check the condition of the bearings

I only

II only

Neither I nor II

Both I and II

40 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

I only

II only

Neither I nor II

Both I and II

41When shipboard electrical distribution circuits are connected in parallel, additional parallel circuits will cause the total circuit resistance to ____.

Increase, causing a drop in the line current

Increase, causing a decrease in the line voltage

Decrease, causing an increase in the line voltage

Decrease, causing an increase in the line current

42Which 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

Insufficient compartment ventilation is being provided

A short circuit exists in one of the battery cells

The battery is undergoing its normal charging rate

43When 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

It reduces the possibility of short circuits

It increases the efficiency of the equipment by allowing more current to be used

It creates a larger voltage drop in the circuit being protected

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

It should be disconnected from the prime mover and raised off its bearing supports

Insulation resistance readings should be taken weekly to ensure resistance is not deteriorating

The windings and collector rings should be protected with a thin coat of grease or oil

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

45 Proper storage battery maintenance includes ____.

Making sure electrolyte level is below the separator plates

Keeping connections light and casing surface clean

Insulating the terminals with naval jelly

Maintaining a high charging rate at all time

46A common type of protective covering used on electrical conductors is _____________.

Plain paper

Fibrous braid

Silver sheathing

Babbitt sheathing

47Which of the following statements represents the FIRSTstep in seating new brushes on slip rings?

Press the brushes against the slip ring with a woodblock.

Increase brush pressure and run at no load for 3 to 4hours.

Apply seating compound under the brushes and run atno load for 2 hours.

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

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

Systematic rotation of circuit cards with those from spares to allow component cooling

Daily inspection of console foundation bolts

All of the above

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

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

The mechanical shock of paint removal lessens the di‐electric strength of the insulation

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

Paint dust build up has a tendency to cause corrosion

Phase windings frequently become isolated from each other due to dust interference at the terminals

50When mixing electrolyte, which if the following precautions should always be observed?

Use a heavy duty aluminum pail

Add the acid to the water

Add the water to the acid

Mix the solution outdoors

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