Terminologies Fuels and Combustion

from gab

Entropy degrees API

Which is not a viscosity rating?

The theoretically air supplied

Percent excess air is the difference between the air actually supplied and the theoretically required divided by

Calorimeter

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

The theoretically air supplied

Percent excess air is the difference between the air actually supplied and the theoretical air divided by

180 F

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

1 mol carbon dioxide

When 1 mol carbon combines with 1 mol oxygen

Gums,resins and acids

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

Covalent bonds

What kind of bonding do common gases that exist in free state as diatomic molecules experiences?

Volumetric analysis of the flue gas

An Orsat’s apparatus is used for

Gibbs theorem

A theorem that states that the total property of a mixture of ideal gases is the sum of the properties that the individual gases would have if each occupied the total mixture volume alone as the same temperature

Brownian motion

A small enough particles suspended in a fluid will exhibit small random movements due to the statistical collision of fluid molecules on the particle’s surface. This motion is called

Fusion

When two or more light atoms have sufficient energy(available only at high temperature velocities) to fuse together to form a heavier nucleus the process called

Ash

What is the residue left after combustion of a fossil fuel?

Carbon monoxide

What is formed during incomplete combustion of carbon in fuels?

Hydrogen

A gas produced by the combustion of fuel oil and cannot be found in the flue gases is:

Endothermic reaction

Which of the following chemical reactions in which heat is absorbed?

Exothermic reaction

A chemical reaction in which heat is given off

Air

A colorless, odorless mixture of nitrogen and oxygen with traces of other gases water vapor and same impurities.

Advection

The transfer of air and air characteristics by horizontal motion is called

Volumetric weighting for molecular weight and density, and geometric weighting for all other properties except entropy

Properties of non- reacting gas mixtures are given by

Fractional distillation

The process of separating two or more liquids means of the difference in their boiling point.

Flue gas

The gaseous products of combustion of a boiler which contains carbon dioxide, carbon monoxide, oxygen, nitrogen and water vapor is called

Fuel

A substance whose burning with oxygen yields heat energy such as coal, petroleum and natural gas.

Beta radiation

A type of radiation consisting of singly charge particles that generate to intermediate distances.

Chemically correct air- fuel ratio by weight

Stoichiometric ratio is

Fluid density

The increase in velocity past the throat is due to the rapid decrease in the:

Nuclear fusion

In an oxidation – reduction chemical reaction, all of the following occur except:

Gas oil

The residual oil left after distillation of gasoline and kerosene from crude petroleum; yellow to brown oil, used as a diesel fuel and for enriching water gas.

Coal gas

A fuel gas obtained by the destructive distillation of soft coal is called

Gas scrubbing

Removing of impurities from a gas by bubbling it through liquid purifying agent is called

Einstein’s law

During the fusion process, mass is lost and converted to energy according to:

Soot

A finely divided carbon deposit by the smoke or flame is called

Inert gases

Rare gases such as helium, argon, krypton, xenon and radon that are non-reactive are called

Fluid density

Kinematics and dynamic viscosity vary from each other only by a factor equal to the:

Number of atoms in a mole of each isomers

The following properties are different for isomers of the same chemical compound except

The existence of isotopes

Atomic weights of the elements in the periodic table are not whole numbers because of:

The law of definite proportions

The tendency of a pure compound to be composed of the same elements combined in a definite proportion by mass

Gas scrubbing

How do you call of removing of impurities from a gas by bubbling it through a liquid purifying agent?

Lower the activation energy

What is the effect of catalyst in a chemical reaction?

The equilibrium constant

The relationship between the concentration of products and reactants in a reversible chemical reaction given by

Coal gas

What fuel gas obtained by the destructive distillation of soft coal

Fission

The process of splitting the nucleus into smaller fragments.

Bottom ash

The ash that is removed from the combustor after fuel is burn is the:

Water gas

A mixture of hydrogen and carbon monoxide made by passing steam over hot coke.

Non-stoichiometric reactions are rare in the combustion process

All of the following are true of non-stoichiometric reactions except

Cut-off ratio

It is the ratio of the volume at the end of heat addition to the volume at the start of heat addition

Cast iron

Piston rings are made of:

Low injection pressure

Loss power is due to:

Exhaust manifold

A branch system of pipes to carry waste emissions away from the piston chambers of an internal combustion engine is called

Metal edge filter

The type of filter where the filtering elements is replaceable

Two stroke engine

When four events takes place in one revolution of a crankshaft of an engine, the engine is called:

Time injection system

Which of the following does not belong to the group?

J/kg K

Specific heat capacity is an SI derive unit describe as:

Thermostatic expansion valve

A device whose primary function is to meter the flow of refrigerant to the evaporator

Rankine cycle

The internal combustion engines never work in

The general chemical formula for all hydrocarbons is CnHm

1 to 26

. In different combination of interest, as internal combustion engine fuel, n varies from:

The general chemical formula for all hydrocarbons is CnHm

2 to 54

. In different combination of interest, as internal combustion engine fuel, m varies from:

CnH2n+2

The general chemical formula of a paraffin fuel is

CnH2n

Naphthenes and olefins are types of hydrocarbons with chemical formula of:

Which of the following types of hydrocarbons have chemical formula of CnH2n-2

Diolefins

?

Which of the following types of hydrocarbons have chemical formula of CnH2n-4

Asphaltics

?

CnH2n-6

What is the chemical formula of an aromatic type of hydrocarbon fuels?

Gases

At atmospheric condition, hydrocarbon molecules with a low number of carbon atoms, 1 to 4 are

More or less volatile light oils

Hydrocarbons with 5 to 15 carbon atoms are:

Heavy oils

Hydrocarbons with 16 to 26 carbon atoms are referred to as :

Exhaust valve

In a four stroke engine if a valve opens 25 before B.D.C. and close 10 after T.D.C the valve should be:

Velocity of flow

In a hot wire anemometer the rate of heat loss from sensing element is a function of:

Valve springs of defective material

Sticking valves

Late timing of fuel injection

Detonation of pinging noise is due to :

Increase

The thermal efficiency of a dual cycle engine with fixed compression ratio and fixed quantity of heat and with increase in pressure ratio, will

Between 95% and 100 %

Scavenging efficiency of a four stroke diesel engine is:

75 to 90%

Volumetric efficiency of a well designed engine may be in the range of:

30

During idling in compression ignition engine the air fuel ratio may be of the order of:

Complete or partial stoppage of fuel supply because of vaporization of fuel in supply steam

Vapor lock is

The fuel emits vapors at a rate which produces and inflammable mixture with air

Flash point of liquids is the temperature at which:

Increased

The mean effective pressure of a diesel cycle having fixed compression ratio will increase if cut off ratio is:

Are the spots where heavier functions of fuel are vaporized

Hot spots

Maximum 49 C

Flash point for diesel fuel oil should be:

Multi-cylinder engines

Morse test is conducted on :

Small engines

Prony brake is used for testing of:

the temperature at which paraffin ad waxes in oil start precipitating

Clog point of an oil refer to:

two isentropic and two constant volumes processes

Otto cycle consists of

two isentropic, one constant volume and one constant pressure processes

Diesel cycle consists of:

Gases dissociate at higher temperature

Which is not correct for calculating air standard efficiency?

Between 2 and 5

The king pin inclination is generally:

Crank

For balancing single cylinder engine a counter weight is added to:

Feeler gauge

To measure the clearance between the valve and tappet of an automobile engine we use a

Thermal efficiency of the engine can be improve

By supercharging:

Front wheel

Speedometer drive is generally taken from:

An instrument used for distance measurement

Odometer is:

Soft water

Automobile radiator is filled with:

A step up transformer

The ignition coil acts as:

Dc series motor

The self starting motor for automobiles is a:

25 A

Starting motor current may be about

Piston rings

As a rule before the piston are removed, it is essential to remove the :

High speed and worn engine

Common causes for excessive oil consumption