Related Questions

Nitroglycerene absorbed in wood flour, sodium nitrate or ammonium nitrate is commercially used as a controlled explosive called dynamite. The raw material used for its manufacture are glycerene, nitric acid and
A Sulphuric acid
B Phosphoric acid
C Hydrochloric acid
D Hydroflouric acid
Alkyd resin e.g., glyptal resin formed by phthalic anhydride and glycerene is not used
A For surface coating of automobiles & air crafts
B For fibre making
C As plasticiser for PVC & nitrocellulose
D For film forming materials
Percentage of glycerene present in the spent lye obtained during soap manufacture is about
A 0.5
B 5
C 20
D 35
Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has
A High neutron absorption cross-section
B Low moderating efficiency
C High neutron scatter cross-section
D Low neutron absorption cross-section
Heavy water is preferred over ordinary water as a coolant, because it.
A Acts both as an efficient coolant as well as a moderator
B Can be heated to a higher temperature without pressurizing
C Is less prone to radiation damage
D All of the above
The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called
A Condenser efficiency
B Vacuum efficiency
C Nozzle efficiency
D Boiler efficiency
Water is normally used as a coolant in the heat exchange equipments mainly because ofits
A Abundance & high heat capacity
B Low density
C Low viscosity
D High fluidity
In self cooled motors the cooling time constant is about ______ than the heating time constant because cooling conditions are worse at standstill.
A 2 to 3 times greater
B 3 to 4 times greater
C 4 to 5 times greater
D none of the above
Gas cooling as compared to water cooling of nuclear reactors
A Can not attain a high temperature
B Is more efficient as gas has a higher specific heat
C Can produce only saturated steam for feeding to power turbine
D None of these
Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.
A Wet bulb
B Dry bulb
C Saturation
D Dew point

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