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PRELIM AAMT 2-10 > AMT2103 MIDTERMS > Flashcards

AMT2103 MIDTERMS Flashcards

1
Q

It is equally important, though not nearly as visible.

A

Fuel

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2
Q

It is often considered to be the life blood of an engine.

A

Lubricating oil

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3
Q

3 classifications lubricants

A
  1. Liquid Lubricants or Lubricant oil
  2. Semi-solid or Greases
  3. Solid Lubricants
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4
Q

Without it, the friction and wear produced between moving parts would cause an engine to wear at a very rapid rate.

A

Lubricating oil

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5
Q

REDUCES FRICTION AND WEAR BETWEEN TWO MOVING/SLIDING METALLIC SURFACES BY PROVIDING A CONTINUOUS FLUID FILM IN BETWEEN THEM.

A

LUBRICATING OILS

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6
Q

Lubricating oil also acts as?

A
  1. Cooling Medium
  2. Sealing Agent
  3. Corrosion Preventer
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7
Q

GOOD LUBRICATING OIL MUST POSSES:

A

a. A LOW PRESSURE ( HIGH BOILING POINT)
b. ADEQUATE VISCOSITY FOR PARTICULAR SERVICE CONDITION
c. LOW FREEZING POINT
d. HIGH OXIDATION RESISTANT
e. HEAT STABILITY
f. NON – CORROSIVE PROPERTIES
g. STABILITY TO DECOMPOSITION AT THE OPERATING TEMPERATURE

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8
Q

What are the three oil that is under lubricating oil or liquid lubricants

A
  1. VEGETABLE OIL AND ANIMAL OIL
  2. MINERAL OIL
  3. BLENDED OIL
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9
Q

BEFORE THE ADVENT OF PETROLEUM INDUSTRY, OIL OF _____ AND _____ ORIGINS WERE THE MOST COMMONLY USED LUBRICANTS. THEY POSSES GOOD OILINESS

A

ANIMAL AND VEGETABLE OIL

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10
Q

UNDERGO OXIDATION EASY FORMING GUMMY AND ACIDIC PRODUCTS AND GET THICKENED ON COMING IN CONTACT WITH AIR

A

ANIMAL AND VEGETABLE OIL

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11
Q

HAVE SOME TENDENCY TO HYDROLYZE, WHEN ALLOWED TO REMAIN CONTACT WITH MOIST AIR OR AQUEOUS MEDIUM.

A

ANIMAL AND VEGETABLE OIL

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12
Q

CHARACTERISTIC OF AN OIL: COSTLY

A

ANIMAL AND VEGETABLE OIL

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13
Q

AT PRESENT TIME THEY ARE RARELY USED AS SUCH

A

ANIMAL AND VEGETABLE OIL

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14
Q

ACTUALLY THEY ARE USED AS BLENDING AGENT WITH OTHER LUBRICATING OIL LIKE MINERAL OILS TO PRODUCE DESIRE EFFECT IN THE LATTER

A

ANIMAL AND VEGETABLE OIL

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15
Q

ARE OBTAINED BY DISTILLATION OF
PETROLEUM.

A

MINERAL OR PETROLEUM OIL

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16
Q

THESE ARE THE MOST WIDELY USED LUBRICANTS

A

MINERAL OR PETROLEUM OIL

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17
Q

THE LENGTH OF THE HYDROCARBON CHAIN IN PETROLEUM OIL
VARIES BETWEEN ABOUT

A

12 TO 50 CARBON ATOMS.

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18
Q

CHARACTERISTIC OF AN OIL: CHEAP

A

MINERAL OR
PETROLEUM OIL

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19
Q

CHARACTERISTIC OF AN OIL: AVAILABLE IN ABUNDANCE

A

MINERAL OR PETROLEUM OIL

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20
Q

CHARACTERISTIC OF AN OIL: QUITE STABLE UNDER SERVICE CONDITIONS.

A

MINERAL OR PETROLEUM OIL

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21
Q

THEY POSSES POOR OILINESS

A

MINERAL OR PETROLEUM OIL

22
Q

NO SINGLE OIL SAVES AS THE MOST SATISFACTORY LUBRICANT FOR MANY OF THE MODERN MACHINERIES

A

BLENDED OILS

23
Q

OILINESS OF A LUBRICANT CAN BE INCREASED BY ADDITION OF AN _____ LIKE VEGETABLE OILS AND FATTY ACIDS

A

OILINESS-CARRIERS

24
Q

A THICK FILM OF OIL IS DIFFICULT TO MAINTAIN, AND THE OIL NEED TO HAVE A HIGH OILINESS.

A

EXTREME-PRESSURE ADDITIVES

25
Q

BESIDES IMPROVING OILINESS DIRECTLY

A

HIGH-PRESSURE ADDITIVES

26
Q

CONTAIN CERTAIN MATERIALS WHICH ARE ABSORBED ON THE METAL SURFACE OR REACT CHEMICALLY WITH METAL, PRODUCING A SURFACE A LAYER OF LOW SHEAR- STRENGTH ON THE METAL SURFACE, THEREBY PREVENTING THE TEARING UP OF THE METAL.

A

EXTREME-PRESSURE ADDITIVES

27
Q

THEY REACT AT HIGH TEMPERATURE ON METAL SURFACES, FORMING SURFACE ALLOYS SO AS TO PREVENT THE WELDING TOGETHER OF THE RUBBING PARTS UNDER SEVERE OPERATING CONDITIONS.

A

HIGH-PRESSURE ADDITIVES

28
Q

DEPRESSING ADDITIVES USED ARE PHENOL AND CERTAIN CONDENSATION PRODUCTS OF CHLORINATED WAX WITH NAPHTHALENE

A

pour-point

29
Q

THESE PREVENT THE
SEPARATION OF WAX FROM THE OIL

A

pour-point

30
Q

WHEN ADDED TO OIL, RETARD OXIDATION OF OIL BY GETTING THEMSELVES PREFERENTIALLY OXIDIZED.

A

ANTIOXIDANTS OR INHIBITORS

31
Q

THEY ARE PARTICULARLY ADDED IN LUBRICANTS USED IN INTERNAL COMBUSTION ENGINES, TURBINES, ETC., WHERE OXIDATION OF OIL IS A SERIOUS PROBLEM.

A

ANTIOXIDANTS OR INHIBITORS

32
Q

ARE AROMATIC, PHENOLIC OR AMINO COMPOUNDS

A

ANTIOXIDANTS

33
Q

ARE ORGANIC COMPOUNDS OF PHOSPHORUS OR ANTIMONY.

A

Corrosion Preventers

34
Q

THEY PROTECT THE METAL FROM CORROSION BY PREVENTING CONTACT BETWEEN THE METAL SURFACES AND THE CORROSIVE SUB

A

Corrosion Preventers

35
Q

ARE DETERGENTS SUCH AS THE SALTS OF PHENOL AND CARBOXYLIC ACIDS.

A

DEPOSIT INHIBITORS

36
Q

HAVE HIGHER SHEAR OR FRICTIONAL RESISTANCE THAN OILS AND, THEREFORE, CAN SUPPORT MUCH HEAVIER LOADS AT LOWER SPEEDS.

A

GREASES OR SEMI-SOLID

36
Q

ARE FORMED IN INTERNAL COMBUSTION ENGINE,
DUE TO IMPERFECT COMBUSTION.

A

DEPOSIT

37
Q

THEY ALSO DO NOT
REQUIRE AS MUCH ATTENTION UNLIKE THE LUBRICATING LIQUIDS.

A

GREASES OR SEMI-SOLID

38
Q

HAVE A
TENDENCY TO SEPARATE INTO OILS AND SOAPS

A

GREASES

39
Q

IN SITUATIONS WHERE OIL CANNOT REMAIN IN PLACE, DUE TO HIGH LOAD, LOW SPEED,
INTERMITTENT OPERATION ETC.

A

GREASES

40
Q

IN BEARING AND GEARS THAT WORK AT HIGH TEMPERATURES

A

GREASES

41
Q

DRIPPING OR SPURTING OF OIL IS UNDESIRABLE, BECAUSE UNLIKE OILS, ____ IF USED
DO NOT SPLASH OR DRIP OVER ARTICLES BEING PREPARED BY THE MACHINE.

A

GREASES

41
Q

IN SITUATIONS WHERE BEARING NEEDS TO BE SEALED AGAINST ENTRY OF DUST, DIRT,
GRIT OR MOISTURE, BECAUSE _____ ARE LESS LIABLE TO CONTAMINATION.

A

GREASES

42
Q

SOLID LUBRICANTS ARE USED WHERE:

A
  1. OPERATING CONDITIONS ARE SUCH THAT A LUBRICATING FILM CANNOT BE
    SECURED BY USE OF LUBRICATING OILS OR GREASES.
  2. CONTAMINATION (BY THE ENTRY OF DUST OR GRIT PARTICLES) OF
    LUBRICATING OIL OR GREASE IS UNACCEPTABLE.
  3. OPERATING TEMPERATURES OR LOAD IS TOO HIGH EVEN FOR A SEMI-SOLID
    LUBRICANT TO REMAIN IN POSITION; AND (IV) COMBUSTIBLE LUBRICANTS MUST BE AVOIDED
43
Q

THE TWO MOST USUAL SOLID LUBRICANTS

A
  1. Graphite
  2. Molybdenum Disulfide
44
Q

MODERN SYNTHETIC LUBRICANTS POSSESS, IN GENERAL, THE FOLLOWING DISTINGUISHING CHARACTERISTICS:

A

a. NON-INFLAMMABLE
b. HIGH FLASH POINTS
c. HIGH THERMAL STABILITY AT HIGH OPERATING TEMPERATURES
d. HIGH VISCOSITY-INDEX
e. CHEMICAL STABILITY

45
Q

CAN BE USED UNDER ABNORMAL CONDITIONS LIKE EXTREMELY HIGH TEMPERATURE, CHEMICALLY REACTIVE ATMOSPHERE, ETC. BY EMPLOYING CERTAIN SPECIFIC ADDITIVES.

A

PETROLEUM-BASED LUBRICANTS

46
Q

THE SAME LUBRICANT MAY HAVE TO USE IN THE TEMPERATURE RANGE OF ____ AND ____

A

-50°C and 250°C

47
Q

HAVE BEEN DEVELOPED WHICH ALONE CAN MEET THE MOST DRASTIC AND SEVERE CONDITIONS SUCH AS THOSE EXISTING IN AIRCRAFT ENGINES

A

SYNTHETIC LUBRICANTS

48
Q

IT SHOULD POSSESS LOW FREEZING POINT, HIGH VISCOSITY-INDEX AND ALSO SHOULD BE NON-INFLAMMABLE

A

LUBRICANT

PRELIM AAMT 2-10 (5 decks)

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