17) The diameter of flue tube in a Cornish boiler is __________ that of the shell.

one-fourth

one-third

two-fifth

three-fifth

Answer is:

three-fifth

increases

decreases

has no effect on

none of these

Answer is:

internally fired

externally fired

internally as well as externally fired

none of these

Answer is:

lever safety valve

dead weight safety valve

high steam and low water safety valve

all of these

Answer is:

Explanation:

A safety valve usually employed with stationary boilers is
* lever safety valve
* dead weight safety valve
* high steam and low water safety valve

induced steam jet draught

chimney draught

forced steam jet draught

none of these

Answer is: