Steam Boilers, Engines, Nozzles and Turbines
Locomotive boiler is a

Single tube, horizontal, internally fired and stationary boiler
Multi-tubular, horizontal, internally fired and mobile boiler
Single tube, vertical, externally fired and stationary boiler
Multi-tubular, horizontal, externally fired and stationary boiler

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Steam Boilers, Engines, Nozzles and Turbines
The main object of a boiler trial is

To determine the generating capacity of the boiler
To determine the thermal efficiency of the boiler when working at a definite pressure
All of these
To prepare heat balance sheet for the boiler

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Steam Boilers, Engines, Nozzles and Turbines
The principal function of a stop valve is to

Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
Increase the temperature of saturated steam without raising its pressure
Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit

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Steam Boilers, Engines, Nozzles and Turbines
Pick up the wrong statement about water tube boiler in comparison to fire tube boilers

Chances of explosion are less in former case
Rate of steam flow is more in former case
Former is used for high installed capacity
Former occupies less space for same power

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