Related Questions
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4
Which of the following is preferred for riveting?
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Hot extrusion process is not used for making
A. Cast iron pipe for domestic water supply
B. Aluminium curtain rods
C. Stainless steel tubes used in furnitures
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4
An ideal material for making cooking vessels should have
C. High thermal conductivity
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4
Heat flow across a hollow sphere of inner radius 'r1' and outer radius 'r2' is directly proportional to
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4
__________ is the hardest material out of the following.
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Brittleness induced due to the presence of sulphur in steel can be reduced by adding
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Which of the following material handling equipments is not suitable for moving materials in varying paths?
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The approximate height of a blast furnace having a useful volume of 2000 m3 is about __________ metres
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The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm.
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4
Cold chisels hammers are made of
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Use of flux during soldering is done to
A. Increase fluidity of solder by lowering its melting temperature
B. Prevent oxide formation
C. Wash away surplus solder
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4
For the Stoke's law to be valid in the case of a falling sphere in a fluid, the
A. Reynolds number (based on sphere diameter) should be < 1
B. Flow around the sphere should be in turbulent region
C. Sphere must be metallic
D. Fluid density should be constant
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Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress.
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4
Energy of the sun arises mainly from __________ reactions.
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A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.
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4
Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution
A. A1 is more alkaline than solution A2
C. A2 is very slightly acidic
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4
Potable water means the water used for
D. Evaporation to produce steam
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Metal cutting by oxy-acetylene flame is accomplished by the __________ of the metal.
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The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C.
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Metalloids
A. Are good conductor of heat & electricity
B. Act as electron donors with metals & as electron acceptor with non-metals
C. Are not necessarily solids at room temperature
D. Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron
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Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.
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The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the
A. Ability to absorb shock
B. Capacity to store energy
C. Ratio of the wire & coil diameters
D. Load to produce unit deflection
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The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?
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Venturimeter is used to measure the flow rate of fluids in pipes, when the pipe is in __________ position.
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Oxide layer formed on the non-ferrous metal surface after its annealing is
A. Removed by acid pickling
B. Hammered into the surface
C. Removed with coarse emery cloth
D. Left as such to protect the surface
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4
A reduction in thermal resistance during heat transfer does not occur in the
A. Convection heat transfer by stirring the fluid and cleaning the heating surface
B. Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity
C. Radiation heat transfer by increasing the temperature and reducing the emissivity
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4
Titanium is produced by __________ of Ti Cl4.
A. Electrolytic reduction
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The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the __________ allowance.
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Vernier calipers cannot be used to measure the
A. I.D. & O.D. of the shaft
D. Clearance between two mating surfaces
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Ferromagnetic materials owe their properties to __________ inner sub-shells.