PLACEMENT PAPERS WITH SOLUTIONS.
SAIL (Mechanical Engineering)
1. Pistons of Diesel engines are usually cooled by
Lubricating oil.
2. When a hydrocarbon fuel burns in excess air, Orsat analysis of products of combustion will show
CO, CO2 and N2.
3. What will be the products of combustion shown by an Orsat analyzer when natural gas burns in deficit air?
CO2, CO and N2.
4. The energy produced by 4.5 tons of high-grade coal is equivalent to the energy produced by
1 gram of Uranium.
5. Enriched Uranium is one in which
Percentage of U235 has been artificially increased.
6. The reflectivity in a reactor depends upon
Geometry of the reflector.
Energy of neutrons.
Properties of reflector.
All of these.
7. Shielding in a nuclear power plant is done
To protect against neutron and gamma rays.
8. This substance has the minimum value of thermal conductivity
Air.
9. Dimensionless number is represented by
Fourier number.
10. Floating heads are provided in heat exchangers to
Regulate the flow.
11. In the film established along a vertical plate during condensation of any vapour over the plates, the temperature distribution curve is
Concave upwards.
12. In spite of large heat transfer coefficients in boiling liquids, cavities are used advantageously when the entire surface is exposed to
Film boiling.
13. Ice is very close to a
Gray body.
14. In a refrigeration plant, if the condenser temperature increase, the power input to the compressor will
Increase.
15. In gas cycle refrigeration system, an expander replaces the throttle valve of a vapour compression system, because
The drop-in temperature by throttling the gas is very small.
16. In an aircraft refrigeration system, the pressure at the cooling turbine outlet is equal to
Cabin pressure.
17. If the specific humidity of moist air remains the same but its dry bulb temperatures increases, its dew point temperature
Remains the same.
18. In an adiabatic saturation process of air
The enthalpy remains constant.
19. If air flows over a cooling coil, dehumidification of air will take place if the coil surface temperature is below the following of the entering air
Dew point temperature.
20. In winter air-conditioning, the process is
Heating, humidification and heating.
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