19) Fire tube boilers are

internally fired

externally fired

internally as well as externally fired

none of these

Answer is:

internally fired

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:

The factor of evaporation for all boilers is always greater than unity.

The amount of water evaporated in kg per kg of fuel burnt is called equivalent evaporation from and at 100 Degree Centigrade.

The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called boiler efficiency.

none of these

Answer is:

piston rod

connecting rod

eccentric rod

valve rod

Answer is: