Exam Question
Q2
With regards to boiler water level control. Explain the following
(16)
(a) Shrink and swell phenomenon
(b) Cascade control
(c) Split control
(d) Condensing chamber - Function and location.
Class 2 (2nd Engineer)
MEKG
📅 Jan 2026
Reference Answer
### (a) Shrink and Swell Phenomenon
**1. Definition:**
Shrink and Swell are transient phenomena that cause a temporary, and often misleading, change in the indicated boiler drum water level in response to a rapid change in steam demand. This is a volumetric effect, not a change in the mass of water in the drum.
**2. Swell:**
**1. Definition:**
Shrink and Swell are transient phenomena that cause a temporary, and often misleading, change in the indicated boiler drum water level in response to a rapid change in steam demand. This is a volumetric effect, not a change in the mass of water in the drum.
**2. Swell:**
Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.
Prepare on Android — MeoMock on Google Play