AMT2103 MIDTERMS

Question 1

It is equally important, though not nearly as visible.

Answer 1

Fuel

Question 2

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

Answer 2

Lubricating oil

Question 3

3 classifications lubricants

Answer 3

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

Question 4

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

Answer 4

Lubricating oil

Question 5

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

Answer 5

LUBRICATING OILS

Question 6

Lubricating oil also acts as?

Answer 6

1. Cooling Medium
2. Sealing Agent
3. Corrosion Preventer

Question 7

GOOD LUBRICATING OIL MUST POSSES:

Answer 7

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

Question 8

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

Answer 8

1. VEGETABLE OIL AND ANIMAL OIL
2. MINERAL OIL
3. BLENDED OIL

Question 9

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

Answer 9

ANIMAL AND VEGETABLE OIL

Question 10

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

Answer 10

ANIMAL AND VEGETABLE OIL

Question 11

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

Answer 11

ANIMAL AND VEGETABLE OIL

Question 12

CHARACTERISTIC OF AN OIL: COSTLY

Answer 12

ANIMAL AND VEGETABLE OIL

Question 13

AT PRESENT TIME THEY ARE RARELY USED AS SUCH

Answer 13

ANIMAL AND VEGETABLE OIL

Question 14

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

Answer 14

ANIMAL AND VEGETABLE OIL

Question 15

ARE OBTAINED BY DISTILLATION OF
PETROLEUM.

Answer 15

MINERAL OR PETROLEUM OIL

Question 16

THESE ARE THE MOST WIDELY USED LUBRICANTS

Answer 16

MINERAL OR PETROLEUM OIL

Question 17

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

Answer 17

12 TO 50 CARBON ATOMS.

Question 18

CHARACTERISTIC OF AN OIL: CHEAP

Answer 18

MINERAL OR
PETROLEUM OIL

Question 19

CHARACTERISTIC OF AN OIL: AVAILABLE IN ABUNDANCE

Answer 19

MINERAL OR PETROLEUM OIL

Question 20

CHARACTERISTIC OF AN OIL: QUITE STABLE UNDER SERVICE CONDITIONS.

Answer 20

MINERAL OR PETROLEUM OIL

Question 21

THEY POSSES POOR OILINESS

Answer 21

MINERAL OR PETROLEUM OIL

Question 22

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

Answer 22

BLENDED OILS

Question 23

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

Answer 23

OILINESS-CARRIERS

Question 24

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

Answer 24

EXTREME-PRESSURE ADDITIVES

Question 25

BESIDES IMPROVING OILINESS DIRECTLY

Answer 25

HIGH-PRESSURE ADDITIVES

Question 26

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.

Answer 26

EXTREME-PRESSURE ADDITIVES

Question 27

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.

Answer 27

HIGH-PRESSURE ADDITIVES

Question 28

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

Answer 28

pour-point

Question 29

THESE PREVENT THE SEPARATION OF WAX FROM THE OIL

Answer 29

pour-point

Question 30

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

Answer 30

ANTIOXIDANTS OR INHIBITORS

Question 31

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

Answer 31

ANTIOXIDANTS OR INHIBITORS

Question 32

ARE AROMATIC, PHENOLIC OR AMINO COMPOUNDS

Answer 32

ANTIOXIDANTS

Question 33

ARE ORGANIC COMPOUNDS OF PHOSPHORUS OR ANTIMONY.

Answer 33

Corrosion Preventers

Question 34

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

Answer 34

Corrosion Preventers

Question 35

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

Answer 35

DEPOSIT INHIBITORS

Question 36

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

Answer 36

GREASES OR SEMI-SOLID

Question 36

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

Answer 36

DEPOSIT

Question 37

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

Answer 37

GREASES OR SEMI-SOLID

Question 38

HAVE A TENDENCY TO SEPARATE INTO OILS AND SOAPS

Answer 38

GREASES

Question 39

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

Answer 39

GREASES

Question 40

IN BEARING AND GEARS THAT WORK AT HIGH TEMPERATURES

Answer 40

GREASES

Question 41

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

Answer 41

GREASES

Question 41

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

Answer 41

GREASES

Question 42

SOLID LUBRICANTS ARE USED WHERE:

Answer 42

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

Question 43

THE TWO MOST USUAL SOLID LUBRICANTS

Answer 43

1. Graphite 2. Molybdenum Disulfide

Question 44

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

Answer 44

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

Question 45

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

Answer 45

PETROLEUM-BASED LUBRICANTS

Question 46

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

Answer 46

-50°C and 250°C

Question 47

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

Answer 47

SYNTHETIC LUBRICANTS

Question 48

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

Answer 48

LUBRICANT