Related Questions

In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of
A Relative roughness
B Absolute roughness
C Friction co-efficient for flows at equal Reynold number
D All of the above
In machining metals, chips break due to __________ of work material.
A Toughness
B Ductility
C Elasticity
D Work hardening
The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc.
A conduction
B convection
C radiation
D any of the above
International Roughness Index (IRI) -
A কম হলে রাস্তার অবস্থা ভালো বুঝায়
B বেশি হলে রাস্তার অবস্থা ভালো বুঝায়
C কম বা বেশি যাই হোক না কেন, রাস্তার অবস্থা ভালো বুঝায়
D সবগুলো
Which of the following metals forms an amalgam with other metals?
A Tin
B Mercury
C Lead
D Zinc
Ceramic nuclear metals compared to solid nuclear metals have
A higher melting points
B low strength at high temperature
C more chances of radiation damage
D poorer corrosion resistance
There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant?
A Mercury
B Arsenic
C Aluminium
D Lead
Which of the following metals form an amalgam with other metals ?
A Lead
B Tin
C Zinc
D Mercury
An important geometrical quantity in the cutting of metals which can be used as a criterion for machinability of metals is
A Cutting speed
B Feed rate
C Shear angle
D Tool geometry
What type of fusion welding process is used for welding sheet metals of all engineering metals (except Cu, Ag) in automobile and air craft industries, pipe and tubing production?
A Thermit welding
B Electroslag welding
C Resistance welding
D Submerged arc Welding

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