__________ is the most suitable lubricant for drawing mild steel wires?
Kerosene
Water
Sodium stearate
Lime water
Correct Answer :
C. Sodium stearate
Related Questions
Thermodynamic cycle involved in the working of a thermal power plant is the __________ cycle.
Joule
Carnot
Rankine
Brayton
Pick out the wrong statement
Processing of thermosetting plastics is ideally done by injection moulding
Processing of thermoplastics is ideally done by compression moulding
Mass production of seamless pipes are done by electrical resistance welding (ERW)
Stretch forming is a process of cold drawing
Which of the following low melting alloy containing bismuth and lead is used for electric fuse?
Wood's metal
Babbitt metal
Monel metal
Duralumin
Ultimate strength in tension as compared to that in shear for steel is
Half
One third
One and half times
One fourth
The 'laughing gas' is
Nitrous oxide
Nitric oxide
Nitrogen trioxide
Nitrogen pentoxide
In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of
Stainless steel
Mild steel
High speed steel
High carbon steel
__________ of austenite decreases the hardenability in steel.
Fine grains
Coarse grains
Homogeneity
Dissolved elements (except cobalt)
The cathode in an electrochemical cell always carries
Negative charge
Positive charge
Zero charge
Positive or negative charge depending upon the nature of the cell
__________ can replace tungsten in high speed steel.
Chromium
Vanadium
Cobalt
Molybdenum
Out of the following, the joint produced by __________ has the lowest strength.
Soldering
Welding
Brazing
Riveting
__________ is a special constituent of chlorophyll without which photosynthesis is not possible.
Calcium
Nitrogen
Phosphorous
Hydrogen
Reduction in the grain size reduces the __________ of the material.
Fatigue resistance
Tensile strength
Creep resistance
All (A), (B) & (C)
The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system
Is as light as possible
Has very high C.O.P.
Employs minimum quantity of refrigerant
Consumer minimum horse power
Increasing the carbon content of steel
Reduces the upper shelf energy
Increasing the ductility transition temperature
Decreases brittleness
Decreases hardness
For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot?
Temperature - entropy
Temperature - pressure
Enthalpy - entropy
Enthalpy-pressure
The property of material, by which a given amount of energy is absorbed by it, without plastic deformation, is called
Resilience
Toughness
Ductility
Impact strength
Atomic __________ of an element is a whole number.
Weight
Number
Volume
Radius
Silicon percentage in silicon steel used for electrical equipments is about
1
4.0
8
14
Which of the following materials has the poorest electrical conductivity?
Carbon
Aluminium
Silver
Stainless steel
Viscoelastic behaviour is observed in __________ materials.
Non-crystalline organic polymeric
Ceramic
All crystalline
All amorphous
Multistage compression of air as compared to single stage compression offers the advantage of
Power saving per unit weight of air delivered
Moisture elimination in the inter-stage cooler
Increased volumetric efficiency
All (A), (B) & (C)
Cementite is in the lamellar form in the __________ phase of steel.
Martenistic
Bainitic
Pearlitic
Ferritic
In Newton's law of viscosity, which states that the shear stress is proportional to the __________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, 
= velocity gradient).
To improve the machinability of steel, it is generally subjected to
Spheroidising
Tempering
Normalising
Annealing
Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode
Occurs higher in the electro-chemical series of metals
Is exemplified by magnesium plate
Is much cheaper than the cathodic base material to be guarded against corrosion
All (A), (B) & (C)
The two elements required to form substitutional solid solution should not have
Same crystalline structure
Same valency
Widely differing electronegativity
Same atomic sizes
Which of the following has the highest value of refractive index?
Brine (sea water)
Diamond
Distilled water
Glass
Oxyacetylene reducing flame is used while carrying out welding on
Alloy steel
Grey cast iron
Mild steel
High carbon steel
Enzymes belong to the category of
Proteins
Carbohydrates
Vitamins
Fats
Rain drops falling through atmospheric air attain limited terminal velocity, because of
Upward thrust due to air
Viscous force exerted by air
Surface tension effects of water
Force of gravity