Question 66Steam Plants - Assistant Engineer

The correct answer is B) lower level than exists in the drum with the error becoming greater as the drum pressure increases. This is because the density of water decreases as the pressure increases. If the water level indicator is not calibrated to compensate for this, it will show a lower level than the actual water level in the steam drum, and the error will become greater as the drum pressure increases. The other options are incorrect because A) the error would become greater as the pressure decreases, C) the indicator would show a higher level than the actual water level, and D) the error would become greater as the pressure increases, which is the opposite of the correct answer.