In a diesel engine, what- elements in the fuel that make the work of the lubricant more

difficult?

Select one:
a. high octane number
b. sulphur and asphaltene content
c. water and ash content
d. high cetane number
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The correct answer is: sulphur and asphaltene content

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Engines using heavy fuels requires heating of the fuel so that the viscosity at the injector is:

Select one:
a. 200 SSU±50
b. 150 SSU or slightly higher
c. 100 SSU or less
d. around 200 SSU
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The correct answer is: 150 SSU or slightly higher

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A change in the efficiency of combustion in a boiler can usually be determine by comparing

Select one:
a. stack temperature and CO2
b. stack temperature and CO
c. over-the-fire-draft and CO
d. Ringelman chart and CO2
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The correct answer is: stack temperature and CO2

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The water in the product of combustion is in vapor state.

Select one:
a. Ultimate analysis
b. analysis
c. Lower heating value
d. Higher heating value
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The correct answer is: Lower heating value

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Total sulphur content in a diesel fuel oil must not exceed:

Select one:
a. 0.1%
b. 0.15%
c. 0.2%
d. 0.5%
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The correct answer is: 0.5%

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The minimum amount of air required for a complete combustion of fuel is called

Select one:
a. 110% air
b. 90% air
c. excess air
d. theoretical air
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The correct answer is: theoretical air

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Amount of heat liberated by the complete combustion of a unit weight or volume of fuel is:

Select one:
a. heating value
b. latent heat
c. work or compression
d. sensible heat
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The correct answer is: heating value

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Chemical composition of fuel oil

Select one:
a. 90% carbon, 10% hydrogen
b. 85% carbon, 15% hydrogen
c. 80% carbon, 20% hydrogen
d. 70% carbon, 30% hydrogen
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The correct answer is: 80% carbon, 20% hydrogen

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What are the immediate undesirable products from the petroleum-based lubricating oil
when subjected to high pressure and temperature?

Select one:
a. sulfur
b. carbon residue
c. soots and ashes
d. gums, resins, and acids
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The correct answer is: gums, resins, and acids

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Measure of combustibility of diesel fuel:

Select one:
a. Fuel index
b. Octane number
c. Diesel index
d. Cetane number
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The correct answer is: Diesel index

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What type of lubricating oils are produced entirely from the crudes chosen through
elimination of undesired constituents by suitable refining processes?

Select one:
a. additives
b. premium
c. straight
d. inert
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The correct answer is: straight

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Ash is introduced into the crucible at an elevated temperature and held at that temperature
until it becomes uniformly fluid and decomposition gases have been expelled, this
temperature is usually in the range of:

Select one:
a. 2800-3000°F
b. None of the above
c. 2400-2600°F
d. 2600-2800°F
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The correct answer is: 2600-2800°F

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The viscosity of most commercially available petroleum lubricating oil changes rapidly
above:

Select one:
a. 180°F
b. 130°F
c. 150°F
d. 120°F
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The correct answer is: 180°F

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The carbon dioxide percentage in the flue gases for perfect combustion of a fuel oil
compared to coal and based on the same excess air percentage of each is:
Select one:
a. the same
b. higher
c. not uniquely determined by the above conditions
d. lower
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The correct answer is: lower

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What components are included in the proximate analysis in fuel?

Select one:
a. CO, carbon monoxide, excess oxygen
b. Ash, moisture, volatile, fixed carbon
c. Carbon, hydrogen, oxygen
d. Hydrogen, oxygen, moisture
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The correct answer is: Ash, moisture, volatile, fixed carbon

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The gas from sludge digestion tanks is mainly composed of:

Select one:
a. methane
b. hydrogen sulfide
c. carbon dioxide
d. nitrogen
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The correct answer is: methane

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The determination of moisture, volatile matter, fixed carbon and ash in coal:

Select one:
a. proximate analysis
b. Dulong's analysis
c. ultimate analysis
d. dialysis
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The correct answer is: proximate analysis

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It Is the admittance of oil between two surfaces that are in contact and in relative motion to
one another:

Select one:
a. injection
b. supercharging
c. scavenging
d. lubrication
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The correct answer is: lubrication

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Under saturated condition, what is the lowest point at which fuel starts to flow.

Select one:
a. Flash point
b. Pour point
c. Porosity point
d. Stagnation point
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The correct answer is: Pour point

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Difference in pressure measure above or below atmospheric pressure:

Select one:
a. breeching
b. draft
c. stack
d. chimney
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The correct answer is: draft

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The heating value obtained when the water in the products of combustion is in the liquid
state:

Select one:
a. calorific value
b. higher heating value
c. lower heating value
d. average heat value
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The correct answer is: higher heating value

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The chemical formula for butane:

Select one:
a. C3H8
b. C2H402
c. C4H10
d. C2H5CI
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The correct answer is: C4H10

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A property of lubricating oil that measures the thickness of the oil and will help determine
how long oil will flow at a given temp. is known as

Select one:
a. viscosity
b. fire pt.
c. flash pt.
d. cloud pt.
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The correct answer is: viscosity

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If the composition of hydrocarbon fuel is known, the ratio between the nitrogen and oxygen
that is supplied in air is

Select one:
a. intensity
b. equal
c. constant
d. fixed
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The correct answer is: constant

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Clog point of an oil refer to:

Select one:
a. The temperature at which paraffin and waxes in oil start precipitating.
b. The level of impurities beyond which oil ceases to flow
c. The point of maximum contamination of oil
d. The temperature at which oil solidifies
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The correct answer is: The temperature at which paraffin and waxes in oil start precipitating.

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The proportions of carbon, hydrogen, oxygen, nitrogen, sulfur, and ash.

Select one:
a. humidification
b. ultimate analysis
c. neutralization
d. work of compression
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The correct answer is: ultimate analysis

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The spent cooking liquor containing the lignin dissolved from the wood is called:

Select one:
a. hard liquor
b. inorganic salts
c. soda liquor
d. none of the above
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The correct answer is: none of the above

Question 28
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When fuel oil has a high viscosity, we mean that the fuel oil will:

Select one:
a. flow slowly through pipes
b. have a low specific gravity
c. evaporate easily
d. bum without smoke
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The correct answer is: flow slowly through pipes

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When 1 mol of carbon combines with 1 mol of oxygen:

Select one:
a. 1 mol carbon monoxide
b. 1 mol carbon and 1 mol carbon dioxide
c. 1 mol carbon dioxide
d. 2 mols carbon dioxide
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The correct answer is: 1 mol carbon dioxide

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It is the temperature at which vapor forms above the liquid fuel:

Select one:
a. pour point
b. flash point
c. fire point
d. diesel index
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The correct answer is: flash point

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If stack temperature rises with no load increase.

Select one:
a. forced draft fan failure
b. too lean fuel mixture
c. dirty burner cup
d. gas baffle broke
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The correct answer is: gas baffle broke

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An orsat analysis of a flue gas shows CO2 = 12; 02 = 5; CO = 0.0. This analysis can be
interpreted as follows:

Select one:
a. the analysis is probably correct
b. no excess air was used in the combustion
c. the analysis is in error since the terms do not add or 100
d. more air would have produced better combustion
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The correct answer is: the analysis is probably correct

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The indicator used to determine the anti-knock characteristics of gasoline:

Select one:
a. Octane No.
b. Diesel Index
c. Cetane No.
d. Aniline point
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The correct answer is: Octane No.

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The color of lubricating oil indicates:

Select one:
a. viscosity
b. does not indicate qualities
c. qualities
d. does not indicate contamination
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The correct answer is: does not indicate qualities

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Question text

ASTM coal classification is based on:

Select one:
a. Proximate analysis
b. Ultimate analysis
c. Orsat analysis
d. none of the above
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The correct answer is: Proximate analysis

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The temperature at which oil gives off vapor that burns temporarily when ignited:

Select one:
a. wet bulb
b. dew point
c. flash point
d. drop point
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The correct answer is: flash point

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The product of incomplete combustion of gaseous hydrocarbons

Select one:
a. Carbon monoxide, water and ammonia
b. Carbon dioxide and water
c. Water, carbon monoxide and carbon dioxide
d. Carbon monoxide
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The correct answer is: Water, carbon monoxide and carbon dioxide

Question 38
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A gas which will not be found in the flue gases produced by the complete combustion of
fuel oil is:

Select one:
a. hydrogen
b. carbon dioxide
c. oxygen
d. nitrogen
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The correct answer is: hydrogen

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The temperature at which vapors will flare up and then die out:

Select one:
a. flash point
b. fire point
c. pour point
d. boiling point
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The correct answer is: flash point

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What is an apparatus used in the analysis of combustible gases?

Select one:
a. calorimetry
b. calorimeter differential
c. calorimeter
d. calorimeter gas
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The correct answer is: calorimeter