Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used?
Vapour locking
Hot starting
Spark plug fouling
All 'a', 'b' & 'c'
Correct Answer :
C. Spark plug fouling
Related Questions
Transformer cores are normally made from
Soft ferrites
High purity iron
Grain oriented Fe-Si alloy
Al-Ni-Co alloy
An ideal material for making cooking vessels should have
High heat capacity
Low heat capacity
High thermal conductivity
Both (B) and (C)
Enzymes belong to the category of
Proteins
Carbohydrates
Vitamins
Fats
Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about
9 : 1
17 : 1
23 : 1
29 : 1
Holes for riveting purposes should be preferably made by
Cutting torch
Drilling
Punching
None of these
Vernier calipers cannot be used to measure the
I.D. & O.D. of the shaft
Thickness of parts
Depth of holes
Clearance between two mating surfaces
Which of the following materials has the maximum shrinkage allowance?
Brass
Cast iron
Lead
Aluminium alloy
Which of the following is an example of stress corrosion?
Season cracking of brass
Caustic embrittlement of steel
Both (A) & (B)
Neither (A) nor (B)
Matte smelting is used in the extraction of
Lead
Zinc
Aluminium
Copper
__________ is not used as the control rod material in a nuclear reactor.
Cobalt
Hafnium
Cadmium
Boron
With increase in temperature, the electrical conductivity of semiconductors
Increases
Decreases
Remain constant
Either (A) or (B), depends on the type of semi-conductor
Hot extrusion process is not used for making
Cast iron pipe for domestic water supply
Aluminium curtain rods
Stainless steel tubes used in furnitures
Any of these
If Reynolds number is greater than 1, then the
Viscous force is larger than the inertia force
Inertia force is larger than the viscous force
Inertia force is larger than the surface tension force
Inertia force is larger than the gravitational force
Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.
Scratch
Indentation
Dynamic
Rebound
Chromium molybdenum steel cannot be welded using __________ welding.
Thermit
Electrical resistance
Oxy-acetylene
Any of these
Unbreakable crockeries are made from __________ polymers.
Polystyrene
Melamine
Polystyrene
Polyurethane
The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________ of the slag.
Fluidity
Basicity
Acidity
Viscosity
The most abundant metal present in the earth's crust is;
Iron
Copper
Titanium
Aluminium
Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity.
300
800
1400
2000
Unit of viscosity in CGS system is
The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut is
More
Less
Same
More but less than the diameter of bolt
The specific gravity of coal depends mainly on its __________ content.
Carbon
Volatile matter
Ash
Moisture
The following thermocouple may be used for measuring temperature upto 1873°K.
Chromel-alumel
Copper-constantan
Platinum-platinum rhodium
Iron-constantan
Which of the following is not a charge material for cupola?
Limestone
Iron scrap
Iron ore
Pig iron
Glass reacts with
H2SO3
HF
HNO3
K2Cr2O7
Out of the following the refractive index is the highest for
Glass
Diamond
Brine
Kerosene
Which of the following is not a ferromagnetic material?
Nickel
Cobalt
Aluminium
Iron
An example of unsteady non uniform flow is the flow of liquid under pressure through a
Tapering pipe at constant flow rate
Tapering pipe at either decreasing or increasing flow rate
Long pipeline of constant diameter
None of these
Uniform ramming of sand in green sand moulding process leads to
Reduced chance of gas porosity
Greater dimensional stability of the casting
Uniform flow of molten metal into the mould cavity
Less sand expansion type of casting defect
The phenomenon occurring during explosion of a hydrogen bomb is
Nuclear fission
Nuclear fusion
A combination of both nuclear fission & fusion
None of these