__________ the exhaust gas is an indication of the incomplete combustion of fuel.
Low temperature of
High temperature of
High % of CO in
High % of CO2 in
Correct Answer :
C. High % of CO in
Related Questions
Steel is welded using the __________ flame.
Carburising
Neutral
Oxidising
All (A), (B) & (C)
Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is __________ mm.
15
25
10
30
The best guide to judge the general quality of water is the measurement of its
pH value
Electrical conductivity
Turbidity
Dissolved oxygen content
A cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson's ratio of the rod is
0
0.33
0.44
0.25
Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and
Manganese
Silicon
Nickel
Chromium
Pick out the wrong conversion of absolute & kinematic viscosities.
1 stoke = 1 cm2/sec
1 N.sec/m2 = 10 paise
1 stoke = 1 m2/sec
1 m2/sec = 104 stokes
The following type of bonding is strongly directional in solids.
Vander Waal's
Ionic
Metallic
Covalent
Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying oils?
Elaiden test
Reichert-Meissl value test
Hunter value test
Iodine value test
For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.
250
500
1000
3000
An alloy of Fe - 0.4 % C is
Cast iron
Hypo-eutectoid steel
Hyper-eutectoid steel
Eutectoid steel
Increase in the entropy of a system represents the
Degradation of energy
Decrease in system pressure
Increase in the availability of energy
Increase in the temperature
Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that
Pure oxygen has been used for combustion
Nitrogen percentage in the fuel is very high
Excess air has been used for combustion
Hydrogen is not present in the fuel
The refractory lining of the bottom in a basic electric arc furnace is made of
Silica
Alumina
Magnesia
Fireclay
Cassiterite is an ore of
Tin
Lead
Molybdenum
Chromium
Desalination of water
Makes it potable
Makes it non-potable
Means distillation of water
None of these
Solute atoms which cause yield point phenomenon in mild steel are/is
Aluminium
Boron
Carbon
Nitrogen
Out of the following, the joint produced by __________ has the lowest strength.
Soldering
Welding
Brazing
Riveting
Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot
Piercing
Spinning
Drawing
Extrusion
The product (s) of roasting of a sulphide ore is (are)
Oxide only
Sulphate only
Oxide and sulphate
Dependent on temperature and partial pressure of oxygen & sulphur dioxide
Which of the following pairs is not correctly matched?
Uranium - 233 : Fertile material
Binding energy : Mass defect
Scattering: Absorption cross-section
Number of nucleons : Mass number
What is the pH of distilled water?
0
1
7
14
The thermodynamic law, 
= constant, is not followed by the
Free expansion of an ideal gas
Adiabatic expansion of steam in turbine
Adiabatic compression of air
Ideal compression of air
For the irreversible reaction, Ca+ 2C = Ca C2 , Δ H°298 = - 60000 J . mole-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be
30,000 J
60,000 J
90,000 J
2,40,000 J
Fire in fuel gas pipelines is extinguished most effectively by
Spraying water
Blanketting the area with nitrogen atmosphere
Fire fighting foam
None of these
Gage pressure within a spherical droplet of a fluid is 'p'. What will be gage pressure within a bubble of the same size & of the same fluid?
p
2 p
0.5 p
0.25 p
The thickness of oxide film is y at time t. If 
are the temperature dependent constants, the parabolic law of oxidation is given by
The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.
0
100
50
None of these
Damage to metal surface by mechanical action is called
Pitting
Corrosion
Erosion
None of these
Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is
Black
Silver grey
Green
Yellow
Hardening of steel is not possible, unless it is heated __________ critical point.
Above the highest
Above the lowest
Between the first & second
Between the second & third