Engineering MCQs

In a reaction turbine

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the steam is allowed to expand in the nozzle, where it gives a high velocity before it enters the moving blades
the expansion of steam takes place partly in the fixed blades and partly in the moving blades
the steam is expanded from a high pressure to a condenser pressure in one or more nozzles
the pressure and tempe
✅ The correct answer is option B.

Which of the following property of the instantaneous centre is correct ?

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A rigid link rotates instantaneously relative to another link at the instantaneous centre for the configuration of the mechanism considered.
The two rigid links have no linear velocity relative to each other at the instantaneous centre.
The velocity of the instantaneous centre relative to any third rigid link is same whether the instantaneous centre is regarded as a point on the first rigid link or on the second rigid link.
all of the above
✅ The correct answer is option D.

Which of the following would lead to a reduction in thermal resistance?

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In conduction, reduction in the thickness of the material and an increase in thermal conductivity.
In convection, stirring of the fluid and cleaning the heating surface.
In radiation, increasing the temperature and reducing the emissivity.
all of the above
✅ The correct answer is option D.