Dies for wire drawing are generally made of
Mild steel
Stainless steel
Carbides
High carbon steel
Correct Answer :
A. Mild steel
Related Questions
While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about __________ °C.
1800
2000
2400
3000
__________ has a negative co-efficient of linear expansion.
Iron
Copper
Rubber
Nickel
Ammonia gas can be dried by
PCl5
Quick lime
CaCl2
Concentrated H2SO4
Carbon supply in pack carburising process is in the form of
Charcoal
Calcium carbide
Hydrocarbon oil
Graphite
Which of the following rays has the least wavelength?
Ultraviolet rays
Infrared rays
Cosmic rays
X-rays
Electrostatic separation of minerals from each other is based on their differences in the following property.
Densities
Magnetic permeabilities
Electrical conductivities
Hardness
Eutectoid composition of carbon steel at room temperature is
Cementite
Pearlite
Martensite
Ferrite
Factor of safety is the ratio of the __________ stress to the working stress.
Tensile
Compressive
Yield
Bearing
Cemented carbide tools are not suitable for cutting
Aluminium
Brass
Cast iron
Steel
Work done by a/an __________ process is determined by ∫p. dv
Adiabatic
Quasi-static
Isothermal
Isentropic
Function of gear box is to
Reduce the speed
Obtain variable speed
Increase the speed
Produce high torque
Earing is a defect found in steels after the following metal working operation.
Extrusion
Rolling
Deep drawing
Wire drawing
Temperature profile along the length of a gasgas counter flow heat exchanger is correctly represented by
Chlorine acts as a bleaching agent only in the presence of
Dry air
Pure oxygen
Moisture
Sunlight
Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler.
A. Induced draft fan
B. Economiser
C. Air preheater
D. Steam superheater Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories?
A, C, B, D
D, B, C, A
D, C, B, A
D, A, B, C
The delivery pressure of boiler feed water pump compared to the boiler steam pressure is
Same
Slightly less
Slightly more
Much more
A compact estimate about the amount of materials handling between various work stations is obtained from the
Gantt chart
Bin chart
String diagram
Travel chart
Drills are usually made of
Cermets
High speed steel
Alloy steel
Tungsten carbide
The condition of diffraction from a crystal is given by
nλ = 2d Sin θ
λ = d Sin 2θ
λ = 2d Sin 2θ
nλ = d Sin θ
Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are __________ respectively.
70 & 30
30 & 70
50 & 50
90 & 10
Which of the following properties of a solid is not dependent on crystal imperfection?
Ductility
Semi-conductivity
Melting point
Yield stress
The trace metal present in insulin is
Cu
Zn
Fe
Ni
Which of the following is not an ore of copper?
Cryolite
Azurite
Chalcopyrite
Malachite
Recrystallisation temperature of steel is __________ °C.
50
300
500
800
__________ of grey cast iron produces white cast iron.
Tempering
Rapid heating
Rapid cooling
Slow cooling
Tempering of a material does not improve its
Machinability
Toughness
Internal stress level
Softness
Window panes of aeroplanes are normally made of
Perspex (PMMA)
Teflon (PTFE)
Bakelite (phenol formaldehyde)
Polystyrene
Which of the following alloying elements is present in maximum percentage in high speed steel?
Molybdenum
Chromium
Tungsten
Vanadium
Pick out the wrong statement.
Weldability of high carbon steel is poorer compared to low carbon steel
Invar is a magnetic alloy
Magnetic permeability of the diamagnetic material is less than one
Martenistic transformation never goes to completion (i.e., 100%) at room temperature
The emf of a Deniell cell Zn | Zn2+ || Cu2+ | Cu can be increased by
Decreasing the surface area of the electrodes
Increasing the concentration of zinc sulphate solution
Increasing the surface area of the electrodes
Increasing the concentration of copper sulphate solution