Steam Boilers, Engines, Nozzles and Turbines
A nozzle is said to be a convergent nozzle

When the cross-section of the nozzle decreases continuously from entrance to exit
When the cross-section of the nozzle increases continuously from entrance to exit
None of these
When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit

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Steam Boilers, Engines, Nozzles and Turbines
The difference between Cornish boiler and Lancashire boiler is that

Former contains one fire tube and latter contains two fire tubes
Former is fire tube type and latter is water tube type boiler
None of the listed here
Former is water tube type and latter is fire tube type

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