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The function of a safety valve is

A. To blow off steam when the pressure of steam inside the boiler exceeds the working pressure

B. To indicate the water level inside the boiler to an observer

C. To measure pressure of steam inside the steam boiler

D. None of the above

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  15. The turbine blades are
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  17. The clearance in the engine cylinder
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  19. The effect of super-saturation is that the
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  21. In a throttling process
  22. Secondary air is the air used to
  23. The discharge is __________ at critical pressure.
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  26. The maximum heat loss is a boiler occurs due to
  27. The major axis of elliptical manholes on the shell should be provided
  28. The ratio of the actual vacuum to the ideal vacuum in a condenser is called
  29. The diameter of fire tube of Cornish boiler compared to its shell is
  30. The balanced draft furnace is one using